1.一维数组：yyyy-MM
//数据获取
- (NSMutableArray *)dataArray{
if (!_dataArray) {
_dataArray = [[NSMutableArray alloc] init];
//当前日期时间
NSDate *currentDate = [NSDate date];
//设定数据格式为xxxx-mm
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM"];
//通过日历可以直接获取前几个月的日期，所以这里直接用该类的方法进行循环获取数据
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *lastMonthComps = [[NSDateComponents alloc] init];
NSString *dateStr = [formatter stringFromDate:currentDate];
NSInteger lastIndex = 0;
NSDate *newdate;
NSString *minDateStr = @"2019-01";
//循环获取可选月份，从当前月份到最小月份，直接用字符串的比较来判断是否大于设定的最小日期
while (!([dateStr compare:minDateStr] == NSOrderedAscending)) {
[_dataArray addObject:dateStr];
lastIndex--;
//获取之前n个月, setMonth的参数为正则向后，为负则表示之前
[lastMonthComps setMonth:lastIndex];
newdate = [calendar dateByAddingComponents:lastMonthComps toDate:currentDate options:0];
dateStr = [formatter stringFromDate:newdate];
}
}
return _dataArray;
}
2.二维数组
- (NSMutableArray *)dataSource{
if (!_dataSource) {
NSString *currentMonth = @"";
NSDateFormatter *fmt = [[NSDateFormatter alloc]init];
fmt.dateFormat = @"yyyy-MM";
fmt.timeZone = [NSTimeZone localTimeZone];
fmt.locale = [NSLocale currentLocale];
NSString *minDateStr = @"2015-09";
NSString *maxDateStr = @"2017-04";
//NSString *minDateStr = @"2019/01";
//NSString *maxDateStr = [fmt stringFromDate:[NSDate date]];
NSDate *date = [fmt dateFromString:maxDateStr];
NSMutableArray *yearMonthList = [NSMutableArray array];
int i = 0;
// 循环，月份递减，直到年月等于最小值即可
// 注意：循环退出条件，避免死循环！
do {
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *adcomps = [[NSDateComponents alloc]init];
[adcomps setYear:0];
// 因为这里需要包含最大月份，所以需要这个判断
adcomps.month = i == 0 ? 0 : -1;
i += 1;
date = [calendar dateByAddingComponents:adcomps toDate:date options:0];
currentMonth = [fmt stringFromDate:date];
if (i > 100 ){
NSLog(@"可能是死循环，手动跳出循环");
break;
}
[yearMonthList addObject:currentMonth];
} while ([currentMonth compare: minDateStr] == NSOrderedDescending);
// 存储处理后的数据集
NSMutableArray *resultList = [NSMutableArray array];
// 存储年月数据对象(year-months)
YearDayModel *yearModel = [[YearDayModel alloc]init];
// 存储该 year 中包含的所有 month
NSMutableArray *monthTmpList = [NSMutableArray array];
for (NSString *YMStr in yearMonthList) {
NSArray *tmpList = [YMStr componentsSeparatedByString:@"-"];
NSString *year = tmpList.firstObject;
NSString *month = tmpList.lastObject;
if ([yearModel.year isEqualToString:year]) {
// 当前 year 在 resultList 中已存储，局部变量不需要初始化
}else{
// 当前 year 在 resultList 中未存储，是新的年份，所以需要对部分变量初始化！
[monthTmpList removeAllObjects];
yearModel = [[YearDayModel alloc]init];
yearModel.year = year;
}
[monthTmpList addObject:month];
yearModel.months = monthTmpList;
// 去除月份不“完整”的数据，最后只会保留该 year 中，month 最完整的那条记录
[resultList enumerateObjectsWithOptions:NSEnumerationReverse usingBlock:^(YearDayModel * _Nonnull model, NSUInteger idx, BOOL * _Nonnull stop) {
NSArray *currentObj = model.months;
if (currentObj.count > 0) {
if (model.year == yearModel.year) {
[resultList removeObject:model];
}
}
}];
[resultList addObject:yearModel];
}
_dataSource = resultList;
}
//NSLog(@"%@",_dataSource);
return _dataSource;
}
Model:
#import "BaseModel.h"
NS_ASSUME_NONNULL_BEGIN
@interface YearDayModel : BaseModel
@property (nonatomic,copy)NSString *year;
@property (nonatomic,copy)NSArray *months;
@end
NS_ASSUME_NONNULL_END
使用：
@property (strong,nonatomic)NSMutableArray *dataSource;//年月数据源
@property (assign,nonatomic)NSInteger indexY;//选择了年的index
#pragma mark - UIPickerView
// 返回选择器有几列.
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
return 2;
}
// 返回每组有几行
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
switch (component) {
case 0:
return self.dataSource.count;
break;
case 1:{
if (self.dataSource.count == 0 ){ return 0; }
YearDayModel *model = self.dataSource[self.indexY];
return model.months.count;
}
break;
default:
break;
}
return 0;
}
// 返回第component列第row行的内容（标题）
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
switch (component) {
case 0:{
YearDayModel *model = self.dataSource[row];
return [model.year stringByAppendingString:@"年"];
}
break;
case 1:{
YearDayModel *model = self.dataSource[self.indexY];
NSArray *months = model.months;
return [months[row] stringByAppendingString:@"月"];
}
break;
default:
break;
}
return nil;
}
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component{
return 36;
}
// 设置row字体，颜色
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {
UILabel* pickerLabel = (UILabel*)view;
if (!pickerLabel){
pickerLabel = [[UILabel alloc]init];
pickerLabel.autoresizingMask = UIViewAutoresizingFlexibleWidth;
pickerLabel.adjustsFontSizeToFitWidth = YES;
pickerLabel.textAlignment = NSTextAlignmentCenter;
pickerLabel.backgroundColor = [UIColor clearColor];
pickerLabel.font = font(24);
pickerLabel.textColor = [UIColor blackColor];//colorWithHex:0x222222
}
pickerLabel.text = [self pickerView:pickerView titleForRow:row forComponent:component];
return pickerLabel;
}
// 选中第component第row的时候调用
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
switch (component) {
case 0:{
self.indexY = [pickerView selectedRowInComponent:0];
[self.YMpickView reloadComponent:1];
}
break;
case 1:{
//自动显示
if (self.dataSource.count == 0) {return;}
YearDayModel *model = self.dataSource[self.indexY];
NSString *month = model.months[row];
NSString *time = [NSString stringWithFormat:@"%@-%@",model.year,month];
self.monthTF.text = time;
}
break;
default:
break;
}
}
=========================================
UIDatePicker 停止滚动时候，自动显示
// 滚动改变值的响应事件
[self.YMDPickView addTarget:self action:@selector(didSelectValueChanged:) forControlEvents:UIControlEventValueChanged];
#pragma mark - 时间选择器的滚动响应事件
- (void)didSelectValueChanged:(UIDatePicker *)sender {
// 读取日期：datePicker.date
self.selectDate = sender.date;
BOOL selectLessThanMin = [self.selectDate br_compare:self.minLimitDate format:self.selectDateFormatter] == NSOrderedAscending;
BOOL selectMoreThanMax = [self.selectDate br_compare:self.maxLimitDate format:self.selectDateFormatter] == NSOrderedDescending;
if (selectLessThanMin) {
self.selectDate = self.minLimitDate;
}
if (selectMoreThanMax) {
self.selectDate = self.maxLimitDate;
}
[self.datePicker setDate:self.selectDate animated:YES];
NSString *selectDateValue = [NSDate br_getDateString:self.selectDate format:self.selectDateFormatter];
}