iPhone开发【十八】自定义视图之ActionSheet中使用PickerView

转载请注明出处，原文网址：http://blog.csdn.net/m_changgong/article/details/8245964 作者：张燕广

实现的功能：1）打开ActionSheet后展示PickerView，进行选择操作。

关键词：ActionSheet PickerView

1、新建一个Sigle View Application，命名为PickerInActionSheet，工程结构如下：

2、修改ViewController.xib，添加一个TextField控件。

3、修改ViewController.h，如下：

 #import <UIKit/UIKit.h>

 @interface ViewController : UIViewController<UIPickerViewDelegate,UIPickerViewDataSource>

 @property(retain,nonatomic)UIPickerView *picker;
 @property(retain,nonatomic)UIActionSheet *actionSheet;
 @property(retain,nonatomic)IBOutlet UITextField *textField;

 @property(nonatomic,retain)NSDictionary *appleDevices;
 @property(nonatomic,retain)NSArray *deviceCategory;
 @property(nonatomic,retain)NSArray *deviceName;

 -(IBAction)showActionSheet:(id)sender;
 @end

连接输出口textField及操作showActionSheet，如下：

4、修改ViewController.m，如下：

 #import "ViewController.h"

 #define kDeviceCategory 0
 #define kDeviceName 1

 @interface ViewController ()

 @end

 @implementation ViewController
 @synthesize appleDevices;
 @synthesize deviceCategory;
 @synthesize deviceName;
 @synthesize picker;
 @synthesize actionSheet;
 @synthesize textField;

 - (void)viewDidLoad
 {
     [super viewDidLoad];
     // Do any additional setup after loading the view, typically from a nib.
     [self initData];
 }

 //初始化数据
 -(void)initData{
     textField.placeholder = @"请点击。。。";
     textField.textAlignment = UITextAlignmentCenter;

     NSArray *array1 = [NSArray arrayWithObjects:@"iPhone",@"iPad",@"iPod",nil];
     NSArray *array2 = [NSArray arrayWithObjects:@"Mac",@"iMac",@"Mac Mini",@"Mac Pro",nil];
     NSDictionary  *dictionary= [NSDictionary dictionaryWithObjectsAndKeys:array1,@"Mobile",array2,@"Computers",nil];
     appleDevices = [[NSDictionary alloc]initWithDictionary:dictionary copyItems:YES];

     NSArray *components = [self.appleDevices allKeys];
     NSArray *sorted = [components sortedArrayUsingSelector:@selector(compare:)];
     self.deviceCategory = sorted;

     NSString *selectedCategory = [self.deviceCategory objectAtIndex:0];
     self.deviceName = [self.appleDevices objectForKey:selectedCategory];
 }

 //初始化视图
 -(void)showActionSheetPicker{
     //在title中加入多个换行，给picker留出空间，否则picker会盖住ActionSheet的button
     NSString *title = @"请选择设备\n\n\n\n\n\n\n\n\n\n\n\n\n\n";
     actionSheet = [[UIActionSheet alloc] initWithTitle:title delegate:nil cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:nil,nil];

     picker = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 50, 320, 220)];
     picker.delegate = self;
     picker.dataSource = self;
     picker.showsSelectionIndicator = YES;

     [actionSheet addSubview:picker];
     [actionSheet showInView:self.view];
 }

 -(void)dealloc{
     self.deviceName = nil;
     self.deviceCategory = nil;
     self.appleDevices = nil;
     self.picker = nil;
 }

 - (void)viewDidUnload
 {
     [super viewDidUnload];
     // Release any retained subviews of the main view.
 }

 //显示actionSheet
 -(IBAction)showActionSheet:(id)sender{
     [self showActionSheetPicker];
 }

 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
 {
     //强制用竖屏模式
     return UIInterfaceOrientationIsPortrait(interfaceOrientation);
 }


 #pragma mark Picker Data Source Methods
 - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
     return 2;
 }
 - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
     if(component == kDeviceCategory){
         return [self.deviceCategory count];
     }else{
         return [self.deviceName count];
     }
 }
 - (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
     if(component == kDeviceCategory){
         return [self.deviceCategory objectAtIndex:row];
     }else{
         return [self.deviceName objectAtIndex:row];
     }
 }

 - (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component{
     if(component==kDeviceCategory){
         return 150;
     }else{
         return 170;
     }
 }
 - (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component{
     return 35;
 }

 //显示picker中的数据
 -(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
     NSString *inputString;
     if(component == kDeviceCategory){
         NSString *selectedCategory = [self.deviceCategory objectAtIndex:row];
         NSArray *array = [self.appleDevices objectForKey:selectedCategory];
         self.deviceName = array;
         [self.picker selectRow:0 inComponent:kDeviceName animated:YES];
         [self.picker reloadComponent:kDeviceName];

         inputString = selectedCategory;
     }else if(component == kDeviceName){
         NSUInteger selectedCategoryRow = [pickerView selectedRowInComponent:kDeviceCategory];
         NSString *selectedCategory = [self.deviceCategory objectAtIndex:selectedCategoryRow];

         inputString = [NSString stringWithFormat:@"%@-%@",selectedCategory,[self.deviceName objectAtIndex:row]];
     }
     //给文本框设置值
     self.textField.text=inputString;
 }


 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
 }
 @end

5 、运行效果如下：

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