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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