UIPickerView控件在给用户选择某些特定的数据时经常使用到，这里演示一个简单的选择数据，显示在UITextField输入框里，把UIPickerView作为输入View，用Toolbar作为选定数据的按钮。和其他UITableView控件相似，UIPickerView也需要数据源。 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 "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

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

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