选择器，我想大家都不陌生，当需要用户去选择某些范围值内的一个固定值时，我们会采用选择器的方式。选择器可以直观的提示用户选择的值范围、统一信息的填写格式，同时也方便用户快速的进行选择，比如对于性别，正常情况下就只有男女两种情况，那这时候用一个选择器给用户进行选择的话，可以避免错误数据的输入，也更方便用户去填写。再比如需要获取用户的生日信息时，采用选择器的方式可以统一生日的格式，如果让用户自行输入的话，可能会出现各种各样的生日信息格式，不利于数据的存储，但是采用选择器的方式的话，用户可找到对应的日期进行选择即可。
在iOS有专门的一个选择器类UIPickerView，进入UIPickerView的头文件，我们可以发现 UIPickerView直接继承了UIView，其事件处理通过代理方法完成，所以创建UIPickerView的时候记得签它的代理UIPickerViewDataSource和UIPickerViewDelegate。其实它和UITbleView有点像，不过UIPickerView还多了个列属性，UITbleView我们都很熟了，所以可以对比UITbleView的相关属性和代理方法来学习记忆UIPickerView。
一． UIPickerView的代理方法
（1）UIPickerViewDataSource对应的代理方法有（其代理方法必须要实现）：
返回显示的列数
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView;
返回每一列中需要显示的行数
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component;
（2）UIPickerViewDelegate对应的代理方法（其代理方法根据需求进行选择性实现）：
*返回每一列的宽度 *
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component;
返回每一列的高度
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component ;
*返回UIPickerView控件中指定列的列表项的要显示的内容 *
- (nullable NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component ;
返回UIView，作为该UIPickerView控件中指定列的指定行的显示视图
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(nullable UIView *)view ;
选择指定列中的指定行
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component ;
二、UIPickerView和UIDatePicker。
UIDatePicker是系统帮我们封装好的一个时间日期选择器，继承于UIControl，UIDatePicker有一定的局限性，因为它只有四种显示样式：
UIDatePickerModeTime,
UIDatePickerModeDate,
UIDatePickerModeDateAndTime,
UIDatePickerModeCountDownTimer,
如果需求和这四种样式都不符合的话，那么就没办法使用UIDatePicker，比如当只需要显示年、月信息的时候，显然UIDatePicker没办法满足我们的需求，那这时我们只能通过UIPickerView来自定义自己想要的选择器。
三、UIPickerView的自定义使用
（1）创建基类继承于UIView的WXZBasePickView。
我们常见的选择器的样式是一个带透明背景色的view，底部是内容的选择器，有确定和取消按钮，大致如图：
选择器
所以我们创建一个基类view，这个view的样式如图所示样式，之后根据内容的差别创建基于该view的选择器。
在.h中声明各个属性及方法
#import
@interface WXZBasePickView : UIView
@property (nonatomic, strong) UIView *contentView;
//选择器
@property (nonatomic, strong)UIPickerView *pickerView;
//取消按钮
@property (nonatomic, strong)UIButton *cancelButton;
//确定按钮
@property (nonatomic, strong)UIButton *confirmButton;
//选择器每一列的高度
@property (nonatomic, assign)CGFloat pickerViewHeight;
/**
* 创建视图,初始化视图时初始数据
*/
- (void)initPickView;
/**
* 确认按钮的点击事件
*/
- (void)clickConfirmButton;
/**
* pickerView的显示
*/
- (void)show;
/**
* 移除pickerView
*/
- (void)disMiss;
@end
在.m中实现相关方法
#import "WXZBasePickView.h"
#define ScreenWidth [UIScreen mainScreen].bounds.size.width
#define ScreenHeight [UIScreen mainScreen].bounds.size.height
@implementation WXZBasePickView
- (instancetype)init
{
self = [super init];
if (self) {
_pickerViewHeight = 250;
self.bounds = [UIScreen mainScreen].bounds;
self.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.64];
self.layer.opacity = 0.0;
UITapGestureRecognizer *tap=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(disMiss)];
self.userInteractionEnabled = YES;
[self addGestureRecognizer:tap];
[self addSubview:self.contentView];
[self.contentView addSubview:self.pickerView];
[self.contentView addSubview:self.cancelButton];
[self.contentView addSubview:self.confirmButton];
[self initPickView];
}
return self;
}
//初始化选择器内容，创建子类时需实现该父类方法
-(void)initPickView{
}
//点击确定按钮
- (void)clickConfirmButton
{
[self disMiss];
}
//点击取消按钮
- (void) clickCancelButton
{
[self disMiss];
}
//显示选择器
- (void)show
{
[[UIApplication sharedApplication].keyWindow addSubview:self];
[self setCenter:[UIApplication sharedApplication].keyWindow.center];
[[UIApplication sharedApplication].keyWindow bringSubviewToFront:self];
CGRect frame = self.contentView.frame;
frame.origin.y -= self.contentView.frame.size.height;
[UIView animateWithDuration:0.4 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
[self.layer setOpacity:1.0];
self.contentView.frame = frame;
} completion:^(BOOL finished) {
}];
}
//移除选择器
- (void)disMiss
{
CGRect frame = self.contentView.frame;
frame.origin.y += self.contentView.frame.size.height;
[UIView animateWithDuration:0.4 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
[self.layer setOpacity:0.0];
self.contentView.frame = frame;
} completion:^(BOOL finished) {
[self removeFromSuperview];
}];
}
//设置选择器的高度
- (void)setPickerViewHeight:(CGFloat)pickerViewHeight
{
_pickerViewHeight = pickerViewHeight;
self.contentView.frame = CGRectMake(self.contentView.frame.origin.x, self.contentView.frame.origin.y, self.contentView.frame.size.width, pickerViewHeight);
}
- (UIView *)contentView
{
if (!_contentView) {
_contentView = [[UIView alloc]initWithFrame:CGRectMake(0, ScreenHeight, ScreenWidth, self.pickerViewHeight)];
[_contentView setBackgroundColor:[UIColor whiteColor]];
}
return _contentView;
}
- (UIPickerView *)pickerView
{
if (!_pickerView) {
_pickerView = [[UIPickerView alloc]initWithFrame:CGRectMake(0, 0, self.contentView.frame.size.width, self.contentView.frame.size.height)];
[_pickerView setBackgroundColor:[UIColor whiteColor]];
}
return _pickerView;
}
- (UIButton *)cancelButton
{
if (!_cancelButton) {
_cancelButton = [[UIButton alloc]initWithFrame:CGRectMake(16, 0, 44, 44)];
[_cancelButton setTitle:@"取消" forState:UIControlStateNormal];
[_cancelButton setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
[_cancelButton.titleLabel setFont:[UIFont systemFontOfSize:16]];
[_cancelButton addTarget:self action:@selector(clickCancelButton) forControlEvents:UIControlEventTouchUpInside];
}
return _cancelButton;
}
- (UIButton *)confirmButton
{
if (!_confirmButton) {
_confirmButton = [[UIButton alloc]initWithFrame:CGRectMake(self.contentView.frame.size.width - self.cancelButton.frame.size.width - self.cancelButton.frame.origin.x, self.cancelButton.frame.origin.y, self.cancelButton.frame.size.width, self.cancelButton.frame.size.height)];
[_confirmButton setTitle:@"确定" forState:UIControlStateNormal];
[_confirmButton setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
[_confirmButton.titleLabel setFont:[UIFont systemFontOfSize:16]];
[_confirmButton addTarget:self action:@selector(clickConfirmButton) forControlEvents:UIControlEventTouchUpInside];
}
return _confirmButton;
}
@end
(2)、自定义一个日期选择器，可选择显示年、月或者年、月、日以及是否显示“至今”选项。
创建继承于我们自定义好的WXZBasePickView的日期选择器WXZPickDateView
.h声明相关属性和方法
#import "WXZBasePickView.h"
@class WXZBasePickView;
//选择器的选择代理方法
@protocol PickerDateViewDelegate
- (void)pickerDateView:(WXZBasePickView *)pickerDateView selectYear:(NSInteger)year selectMonth:(NSInteger)month selectDay:(NSInteger)day;
@end
@interface WXZPickDateView : WXZBasePickView
@property(nonatomic, weak)id delegate ;
@property(nonatomic, assign)BOOL isAddYetSelect;//是否增加至今的选项
@property(nonatomic, assign)BOOL isShowDay;//是否显示日
//设置默认显示的值
-(void)setDefaultTSelectYear:(NSInteger)defaultSelectYear defaultSelectMonth:(NSInteger)defaultSelectMonth defaultSelectDay:(NSInteger)defaultSelectDay;
@end
```
.m实现相关方法
```
#import "WXZPickDateView.h"
@interface WXZPickDateView()
/** 选择的年 */
@property (nonatomic, assign)NSInteger selectYear;
/** 选择的月 */
@property (nonatomic, assign)NSInteger selectMonth;
/** 选择的日 */
@property (nonatomic, assign)NSInteger selectDay;
@property (nonatomic, assign)NSInteger currentYear;
@property (nonatomic, assign)NSInteger currentMonth;
@property (nonatomic, assign)NSInteger currentDay;
@property (nonatomic, assign)NSInteger defaultYear;
@property (nonatomic, assign)NSInteger defaultMonth;
@property (nonatomic, assign)NSInteger defaultDay;
@property (nonatomic, assign)NSInteger minShowYear;
@property (nonatomic, assign)NSInteger yearSum;
@end
@implementation WXZPickDateView
- (void)initPickView
{
[super initPickView];
_minShowYear = 1940;//最小年份
NSCalendar *gregorian = [[NSCalendar alloc]initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
// 获取当前日期
NSDate* dt = [NSDate date];
// 指定获取指定年、月、日、时、分、秒的信息
unsigned unitFlags = NSCalendarUnitYear |
NSCalendarUnitMonth | NSCalendarUnitDay |
NSCalendarUnitHour | NSCalendarUnitMinute |
NSCalendarUnitSecond | NSCalendarUnitWeekday;
// 获取不同时间字段的信息
NSDateComponents* comp = [gregorian components: unitFlags fromDate:dt];
_yearSum = comp.year-_minShowYear+1;
_currentYear=comp.year;
_currentMonth=comp.month;
_currentDay=comp.day;
_selectYear = comp.year;
_selectMonth = comp.month;
_selectDay = comp.day;
_defaultYear = comp.year;
_defaultMonth = comp.month;
_defaultDay=comp.day;
[self.pickerView setDelegate:self];
[self.pickerView setDataSource:self];
}
-(void)setDefaultTSelectYear:(NSInteger)defaultSelectYear defaultSelectMonth:(NSInteger)defaultSelectMonth defaultSelectDay:(NSInteger)defaultSelectDay{
if (defaultSelectYear!=0) {
_defaultYear=defaultSelectYear;
}
if (defaultSelectMonth!=0) {
_defaultMonth = defaultSelectMonth;
}
if (defaultSelectDay!=0) {
_defaultDay=defaultSelectDay;
}
if (defaultSelectYear==-1) {
_defaultYear=_currentYear+1;
_defaultMonth=1;
_defaultDay=1;
}
[self.pickerView selectRow:(_defaultYear - _minShowYear) inComponent:0 animated:NO];
[self.pickerView reloadComponent:1];
[self.pickerView selectRow:(_defaultMonth - 1) inComponent:1 animated:NO];
if (_isShowDay==YES) {
[self.pickerView reloadComponent:2];
[self.pickerView selectRow:_defaultDay inComponent:1 animated:NO];
}
[self refreshPickViewData];
}
-(void)setIsAddYetSelect:(BOOL)isAddYetSelect{
_isAddYetSelect = isAddYetSelect;
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
//判断是否要显示日，如果显示则返回3列，反之返回2列
if (_isShowDay==YES) {
return 3;
}else{
return 2;
}
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
if (component == 0) {
if (_isAddYetSelect==YES) {
//显示至今选项的话，需要比总共要显示的年份多返回一行
return self.yearSum+1;
}else{
return self.yearSum;
}
}else if(component == 1) {
NSInteger yearSelected = [pickerView selectedRowInComponent:0] + self.minShowYear;
if (yearSelected==_currentYear+1) {
//至今选项的时候月份信息不返回
return 0;
}else{
return 12;
}
}else {
NSInteger yearSelected = [pickerView selectedRowInComponent:0] + self.minShowYear;
if (yearSelected==_currentYear+1) {
//至今选项的时候日信息不返回
return 0;
}else{
NSInteger yearSelected = [pickerView selectedRowInComponent:0] + self.minShowYear;
NSInteger monthSelected = [pickerView selectedRowInComponent:1] + 1;
return [self getDaysWithYear:yearSelected month:monthSelected];
}
}
}
//根据年、月判断日期天数
- (NSInteger)getDaysWithYear:(NSInteger)year
month:(NSInteger)month
{
switch (month) {
case 1:
return 31;
break;
case 2:
if (year%400==0 || (year%100!=0 && year%4 == 0)) {
return 29;
}else{
return 28;
}
break;
case 3:
return 31;
break;
case 4:
return 30;
break;
case 5:
return 31;
break;
case 6:
return 30;
break;
case 7:
return 31;
break;
case 8:
return 31;
break;
case 9:
return 30;
break;
case 10:
return 31;
break;
case 11:
return 30;
break;
case 12:
return 31;
break;
default:
return 0;
break;
}
}
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component
{
//每一行的高度
return 36;
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
NSInteger selectYear;
NSInteger selectMonth;
switch (component) {
case 0:
[pickerView reloadComponent:1];
if (_isAddYetSelect==YES) {
selectYear = row+_minShowYear+1;
}else{
selectYear = row+_minShowYear;
}
if (_isShowDay==YES) {
[pickerView reloadComponent:2];
}
break;
case 1:
selectMonth = row+1;
if (_isShowDay==YES) {
[pickerView reloadComponent:2];
}
default:
break;
}
[self refreshPickViewData];
}
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(nullable UIView *)view
{
NSString *text;
if (component == 0) {
if (_isAddYetSelect==YES) {
if (row+_minShowYear==_currentYear+1) {
text=@"至今";
}else{
text = [NSString stringWithFormat:@"%zd年", row + _minShowYear];
}
}else{
text = [NSString stringWithFormat:@"%zd年", row + _minShowYear];
}
}else if (component == 1){
if (_isAddYetSelect==YES) {
NSInteger yearSelected = [pickerView selectedRowInComponent:0] + self.minShowYear;
if (yearSelected==_currentYear+1) {
text = [NSString stringWithFormat:@""];
}else{
text = [NSString stringWithFormat:@"%zd月", row + 1];
}
}else{
text = [NSString stringWithFormat:@"%zd月", row + 1];
}
}else{
text = [NSString stringWithFormat:@"%zd日", row + 1];
}
UILabel *label = [[UILabel alloc]init];
label.textAlignment = 1;
label.font = [UIFont systemFontOfSize:16];
label.text = text;
return label;
}
- (void)clickConfirmButton
{
if ([self.delegate respondsToSelector:@selector(pickerDateView:selectYear:selectMonth:selectDay:)]) {
[self.delegate pickerDateView:self selectYear:self.selectYear selectMonth:self.selectMonth selectDay:self.selectDay];
}
[super clickConfirmButton];
}
- (void)refreshPickViewData
{
self.selectYear = [self.pickerView selectedRowInComponent:0] + self.minShowYear;
self.selectMonth = [self.pickerView selectedRowInComponent:1] + 1;
if (_isShowDay==YES) {
self.selectDay = [self.pickerView selectedRowInComponent:2] + 1;
}
}
- (void)setYearLeast:(NSInteger)yearLeast
{
_minShowYear = yearLeast;
}
- (void)setYearSum:(NSInteger)yearSum
{
_yearSum = yearSum;
}
-(void)setIsShowDay:(BOOL)isShowDay{
_isShowDay=isShowDay;
}
@end
```
######（3） 创建继承于WXZBasePickView的时间选择器WXZPickTimeView。
.h声明属性及相关方法
```
#import "WXZBasePickView.h"
@class WXZPickTimeView;
@protocol PickTimeViewDelegate
- (void)pickerTimeView:(WXZPickTimeView *)pickerTimeView selectHour:(NSInteger)hour selectMinute:(NSInteger)minute ;
@end
@interface WXZPickTimeView : WXZBasePickView
@property(nonatomic, weak)id delegate ;
-(void)setDefaultHour:(NSInteger)hour defaultMinute:(NSInteger)minute ;
@end
```
.m实现相关方法
```
#import "WXZPickTimeView.h"
@interface WXZPickTimeView () {
UIDatePicker *_datePicker;
}
@property (nonatomic, assign)NSInteger selectHour;
@property (nonatomic, assign)NSInteger selectMinute;
@property (nonatomic, assign)NSInteger day;
@property (nonatomic, assign)NSInteger defaultHour;
@property (nonatomic, assign)NSInteger defaultMinute;
@end
@implementation WXZPickTimeView
- (void)initPickView
{
[super initPickView];
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
// 获取当前日期
NSDate* dt = [NSDate date];
// 定义一个时间字段的旗标，指定将会获取指定年、月、日、时、分、秒的信息
unsigned unitFlags = NSCalendarUnitYear |
NSCalendarUnitMonth | NSCalendarUnitDay |
NSCalendarUnitHour | NSCalendarUnitMinute |
NSCalendarUnitSecond | NSCalendarUnitWeekday;
// 获取不同时间字段的信息
NSDateComponents* comp = [gregorian components: unitFlags
fromDate:dt];
_selectHour=comp.hour;
_selectMinute=comp.minute;
[self.pickerView setDelegate:self];
[self.pickerView setDataSource:self];
[self.pickerView selectRow:_selectHour inComponent:0 animated:NO];
[self.pickerView selectRow:_selectMinute inComponent:1 animated:NO];
}
-(void)setDefaultHour:(NSInteger)hour defaultMinute:(NSInteger)minute{
if (hour!=0) {
_defaultHour=hour;
}else{
_defaultHour=_selectHour;
}
if (minute!=0) {
_defaultMinute = minute;
}else{
_defaultMinute=_selectMinute;
}
[self.pickerView selectRow:_defaultHour inComponent:0 animated:NO];
[self.pickerView reloadComponent:1];
[self.pickerView selectRow:_defaultMinute inComponent:1 animated:NO];
[self refreshPickTimeViewData];
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 2;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
if (component == 0) {
return 24;
}else {
return 60;
}
}
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component
{
return 36;
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
switch (component) {
case 0:
[pickerView reloadComponent:1];
break;
case 1:
default:
break;
}
[self refreshPickTimeViewData];
}
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(nullable UIView *)view
{
NSString *text;
if (component == 0) {
if (row<10) {
text = [NSString stringWithFormat:@"0%zd时", row];
}else{
text = [NSString stringWithFormat:@"%zd时", row];
}
}else if (component == 1){
if (row<10) {
text = [NSString stringWithFormat:@"0%zd分", row ];
}else{
text = [NSString stringWithFormat:@"%zd分", row ];
}
}else{
}
UILabel *label = [[UILabel alloc]init];
label.textAlignment = 1;
label.font = [UIFont systemFontOfSize:16];
label.text = text;
return label;
}
- (void)clickConfirmButton
{
if ([self.delegate respondsToSelector:@selector(pickerTimeView:selectHour:selectMinute:)]) {
[self.delegate pickerTimeView:self selectHour:self.selectHour selectMinute:self.selectMinute];
}
[super clickConfirmButton];
}
- (void)refreshPickTimeViewData
{
self.selectHour = [self.pickerView selectedRowInComponent:0];
self.selectMinute = [self.pickerView selectedRowInComponent:1];
}
@end
```
######（4）创建继承于WXZBasePickView的城市选择器WXZPickCityView。
.h声明相关属性和方法
```
#import "WXZBasePickView.h"
@class WXZPickCityView;
@protocol PickerCityViewDelegate
- (void)pickerArea:(WXZPickCityView *)pickerArea selectProvince:(NSString *)province selectCity:(NSString *)city;
@end
@interface WXZPickCityView : WXZBasePickView
@property(nonatomic, weak)id delegate ;
/**设置默认的省市*/
-(void)setDefaultCity:(NSString *)defaultCity DefaultProvience:(NSString *)defaultProvience;
@end
```
.m实现相关方法
```
#import "WXZPickCityView.h"
@interface WXZPickCityView()
@property (nonatomic, strong, nullable)NSArray *areaDataSource;
@property (nonatomic, strong, nullable)NSMutableArray *provinceArray;
@property (nonatomic, strong, nullable)NSMutableArray *cityArray;
@property (nonatomic, strong, nullable)NSMutableArray *selectedArray;//当前选中的数组
@property (nonatomic, strong, nullable)NSString *selectProvince;
@property (nonatomic, strong, nullable)NSString *selectCity;
@end
@implementation WXZPickCityView
- (void)initPickView
{
[super initPickView];
for (NSDictionary *dic in self.areaDataSource) {
[self.provinceArray addObject:dic[@"state"]];
}
NSMutableArray *citysArr = [NSMutableArray arrayWithArray:[self.areaDataSource firstObject][@"cities"]];
for (NSDictionary *dic in citysArr) {
[self.cityArray addObject:dic[@"city"]];
}
self.selectProvince = self.provinceArray[0];
self.selectCity = self.cityArray[0];
[self.pickerView setDelegate:self];
[self.pickerView setDataSource:self];
}
//设置默认显示的省市
-(void)setDefaultCity:(NSString *)defaultCity DefaultProvience:(NSString *)defaultProvience{
for (NSInteger i = 0; i<_provinceArray.count; i++) {
if ([_provinceArray[i] isEqualToString:defaultProvience]) {
[self.pickerView selectRow:i inComponent:0 animated:NO];
self.selectedArray = self.areaDataSource[i][@"cities"];
[self.cityArray removeAllObjects];
[self.selectedArray enumerateObjectsUsingBlock:^(NSDictionary *obj, NSUInteger idx, BOOL * _Nonnull stop) {
[self.cityArray addObject:obj[@"city"]];
}];
for (NSInteger j= 0; j<_cityArray.count; j++) {
if ([defaultCity isEqualToString:_cityArray[j]]) {
[self.pickerView selectRow:i inComponent:0 animated:NO];
[self.pickerView reloadComponent:1];
[self.pickerView selectRow:j inComponent:1 animated:NO];
[self refreshSelectAreaData];
}
}
}
}
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 2;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
if (component == 0) {
return self.provinceArray.count;
}else {
return self.cityArray.count;
}
}
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component
{
return 36;
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
if (component == 0) {
self.selectedArray = self.areaDataSource[row][@"cities"];
[self.cityArray removeAllObjects];
[self.selectedArray enumerateObjectsUsingBlock:^(NSDictionary *obj, NSUInteger idx, BOOL * _Nonnull stop) {
[self.cityArray addObject:obj[@"city"]];
}];
[pickerView reloadComponent:1];
[pickerView selectRow:0 inComponent:1 animated:YES];
}else if (component == 1) {
if (self.selectedArray.count == 0) {
self.selectedArray = [self.areaDataSource firstObject][@"cities"];
}
}else{
}
[self refreshSelectAreaData];
}
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(nullable UIView *)view
{
for(UIView *singleLine in pickerView.subviews)
{
if (singleLine.frame.size.height < 1)
{
singleLine.backgroundColor =[UIColor grayColor];
}
}
NSString *text;
if (component == 0) {
text = self.provinceArray[row];
}else if (component == 1){
text = self.cityArray[row];
}else{
}
UILabel *label = [[UILabel alloc]init];
label.textAlignment = 1;
label.font = [UIFont systemFontOfSize:16];
label.text = text;
return label;
}
- (void)clickConfirmButton
{
[self.delegate pickerArea:self selectProvince:self.selectProvince selectCity:self.selectCity];
[super clickConfirmButton];
}
- (void)refreshSelectAreaData
{
NSInteger provienceIndex = [self.pickerView selectedRowInComponent:0];
NSInteger cityIndex = [self.pickerView selectedRowInComponent:1];
self.selectProvince = self.provinceArray[provienceIndex];
self.selectCity = self.cityArray[cityIndex];
}
- (NSArray *)areaDataSource
{
if (!_areaDataSource) {
NSString *path = [[NSBundle bundleForClass:[WXZPickCityView class]] pathForResource:@"area" ofType:@"plist"];
_areaDataSource = [[NSArray alloc]initWithContentsOfFile:path];
}
return _areaDataSource;
}
- (NSMutableArray *)provinceArray
{
if (!_provinceArray) {
_provinceArray = [NSMutableArray array];
}
return _provinceArray;
}
- (NSMutableArray *)cityArray
{
if (!_cityArray) {
_cityArray = [NSMutableArray array];
}
return _cityArray;
}
- (NSMutableArray *)selectedArray
{
if (!_selectedArray) {
_selectedArray = [NSMutableArray array];
}
return _selectedArray;
}
@end
```
######（5）创建继承于WXZBasePickView的单列选择器WXZCustomPickView，可根据传进来的数组显示相关的选择内容
.h声明相关属性和方法
```
#import "WXZBasePickView.h"
@class WXZCustomPickView;
@protocol CustomPickViewDelegate
- (void)customPickView:(WXZCustomPickView *)customPickView selectedTitle:(NSString *)selectedTitle;
@end
@interface WXZCustomPickView :WXZBasePickView
@property (nonatomic, strong)NSMutableArray *dataArray;
@property(nonatomic, copy)NSString *defalutSelectRowStr;
@property(nonatomic, weak)id delegate;
@end
```
.m实现相关方法
```
#import "WXZCustomPickView.h"
@interface WXZCustomPickView()
/** 1.选中的字符串 */
@property (nonatomic, strong, nullable)NSString *selectedTitle;
@end
@implementation WXZCustomPickView
- (void)initPickView
{
[super initPickView];
_dataArray=[NSMutableArray mutableCopy];
[self.pickerView setDelegate:self];
[self.pickerView setDataSource:self];
}
-(void)setDefalutSelectRowStr:(NSString *)defalutSelectRowStr{
_defalutSelectRowStr=defalutSelectRowStr;
for (NSInteger i = 0; i<_dataArray.count; i++) {
if ([_dataArray[i] isEqualToString:_defalutSelectRowStr]) {
[self.pickerView reloadAllComponents];
[self.pickerView selectRow:i inComponent:0 animated:NO];
}
}
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
return self.dataArray.count;
}
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component
{
return 36;
}
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component
{
return self.frame.size.width;
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
self.selectedTitle = self.dataArray[row];
}
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(nullable UIView *)view
{
for(UIView *singleLine in pickerView.subviews)
{
if (singleLine.frame.size.height < 1)
{
singleLine.backgroundColor =[UIColor grayColor];
}
}
UILabel *label = [[UILabel alloc]init];
label.font=[UIFont systemFontOfSize:16];
label.textAlignment = 1;
label.text=self.dataArray[row];
return label;
}
#pragma mark -点击确定按钮
- (void)clickConfirmButton
{
[self.delegate customPickView:self selectedTitle:self.selectedTitle];
[super clickConfirmButton];
}
- (void)setDataArray:(NSMutableArray *)dataArray
{
_dataArray = dataArray;
_selectedTitle = dataArray.firstObject;
[self.pickerView reloadAllComponents];
}
@end
```
这样，几种类型的选择器我们都定义好了，在需要选择器的地方，根据需求创建相应的选择器即可。
###四、如何使用已创建好的自定义选择器
引入自定义好的选择器，声明相关属性，签相关协议
```
#import "ViewController.h"
#import "WXZPickDateView.h"
#import "WXZPickAreaView.h"
#import "WXZPickTimeView.h"
#import "WXZCustomPickView.h"
@interface ViewController (){
UIButton *dateButton;
UIButton *selectAreabutton;
UIButton *selectTimeButton;
UIButton *singlePickViewSelectButton;
BOOL isShowDay;//是否显示日信息
}
@end
```
创建相应的按钮，触发相应的选择器
```
- (void)viewDidLoad {
[super viewDidLoad];
dateButton=[UIButton buttonWithType:UIButtonTypeCustom];
dateButton.frame=CGRectMake(100, 100, 100, 50);
[dateButton setTitle:@"选择日期" forState:UIControlStateNormal];
[self.view addSubview:dateButton];
[dateButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[dateButton addTarget:self action:@selector(pickViewSelect:) forControlEvents:UIControlEventTouchUpInside];
dateButton.tag = 1000;
selectAreabutton=[UIButton buttonWithType:UIButtonTypeCustom];
selectAreabutton.frame=CGRectMake(100, 200, 100, 50);
[selectAreabutton setTitle:@"选择地区" forState:UIControlStateNormal];
[self.view addSubview:selectAreabutton];
[selectAreabutton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[selectAreabutton addTarget:self action:@selector(pickViewSelect:) forControlEvents:UIControlEventTouchUpInside];
selectAreabutton.tag = 1001;
selectTimeButton=[UIButton buttonWithType:UIButtonTypeCustom];
selectTimeButton.frame=CGRectMake(100, 300, 100, 50);
[selectTimeButton setTitle:@"选择时间" forState:UIControlStateNormal];
[self.view addSubview:selectTimeButton];
[selectTimeButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[selectTimeButton addTarget:self action:@selector(pickViewSelect:) forControlEvents:UIControlEventTouchUpInside];
selectTimeButton.tag = 1002;
singlePickViewSelectButton=[UIButton buttonWithType:UIButtonTypeCustom];
singlePickViewSelectButton.frame=CGRectMake(100, 400, 100, 50);
[singlePickViewSelectButton setTitle:@"单个数据选择器" forState:UIControlStateNormal];
[self.view addSubview:singlePickViewSelectButton];
[singlePickViewSelectButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[singlePickViewSelectButton addTarget:self action:@selector(pickViewSelect:) forControlEvents:UIControlEventTouchUpInside];
singlePickViewSelectButton.tag = 1003;
}
```
按钮的点击事件：
```
-(void)pickViewSelect:(UIButton *)button{
if (button.tag==1000) {
WXZPickDateView *pickerDate = [[WXZPickDateView alloc]init];
[pickerDate setIsAddYetSelect:YES];//是否显示至今选项
[pickerDate setIsShowDay:YES];//是否显示日信息
[pickerDate setDefaultTSelectYear:2007 defaultSelectMonth:4 defaultSelectDay:1];//设定默认显示的日期
[pickerDate setValidTime:2010];
[pickerDate setDelegate:self];
[pickerDate show];
}else if (button.tag==1001){
WXZPickAreaView *pickerArea = [[WXZPickAreaView alloc]init];
[pickerArea setDelegate:self];
[pickerArea setDefaultCity:@"上海" DefaultProvience:@"上海"];
[pickerArea show];
[self.view endEditing:YES];
}else if (button.tag==1002){
WXZPickTimeView *pickerArea = [[WXZPickTimeView alloc]init];
[pickerArea setDelegate:self];
[pickerArea setDefaultHour:14 defaultMinute:20];
[pickerArea show];
[self.view endEditing:YES];
}else{
NSMutableArray *arrayData = [NSMutableArray arrayWithObjects:@"2k以下",@"2k-5k",@"5k-10k",@"10k-15k",@"15k-25k",@"25k-50k",@"50k以上", nil];
WXZCustomPickView *pickerSingle = [[WXZCustomPickView alloc]init];
[pickerSingle setDataArray:arrayData];
[pickerSingle setDefalutSelectRowStr:arrayData[0]];
[pickerSingle setDelegate:self];
[pickerSingle show];
[self.view endEditing:YES];
}
}
```
选择器的代理方法
```
-(void)pickerDateView:(WXZBasePickView *)pickerDateView selectYear:(NSInteger)year selectMonth:(NSInteger)month selectDay:(NSInteger)day{
NSLog(@"选择的日期是：%ld %ld %ld",year,month,day);
if (isShowDay==YES) {
[dateButton setTitle:[NSString stringWithFormat:@"%ld年 %ld月 %ld日",year,month,day] forState:UIControlStateNormal];
}else{
[dateButton setTitle:[NSString stringWithFormat:@"%ld年 %ld月",year,month] forState:UIControlStateNormal];
}
}
-(void)pickerArea:(WXZPickAreaView *)pickerArea selectProvince:(NSString *)province selectCity:(NSString *)city{
NSLog(@"省市的选择%@ %@",province,city);
[selectAreabutton setTitle:[NSString stringWithFormat:@"%@%@",province,city] forState:UIControlStateNormal];
}
-(void)customPickView:(WXZCustomPickView *)customPickView selectedTitle:(NSString *)selectedTitle{
NSLog(@"选择%@",selectedTitle);
[singlePickViewSelectButton setTitle:selectedTitle forState:UIControlStateNormal];
}
-(void)pickerTimeView:(WXZPickTimeView *)pickerTimeView selectHour:(NSInteger)hour selectMinute:(NSInteger)minute{
NSLog(@"选择的时间：%ld %ld",hour,minute);
[selectTimeButton setTitle:[NSString stringWithFormat:@"%ld时 %ld分",hour,minute] forState:UIControlStateNormal];
}
```
最后，看看效果图：
有需要的可以下载demo看看
#[demo地址](https://github.com/wxzwork/CustomPickView)