iPhone开发【十八】自定义视图之ActionSheet中使用PickerView-白红宇的个人博客

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

发布日期：2021-09-28 18:46:32 浏览次数：10 分类：技术文章

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转载请注明出处，原文网址：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：

[java]
 #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：

[cpp]
 #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  