数据没有显示在pickerView

我试图做单组分选择器例如开始的iOS 6发展的图书，几乎每一件事工作正常，但数据从数组没有出现在pickerView 请帮助数据没有显示在pickerView

了

这里是我的.h文件

<UIPickerViewDataSource , UIPickerViewDelegate> 
{ 
    IBOutlet UIPickerView *singlePicker; 
    NSArray *chaNames; 
} 

@property (strong, nonatomic) IBOutlet UIPickerView *singlePicker; 
@property (strong, nonatomic) NSArray *chaNames; 



- (IBAction)buttonPressed:(id)sender; 


@end

这里是.m文件

#import "SSPSingleComponentViewController.h" 

@interface SSPSingleComponentViewController() 

@end 

@implementation SSPSingleComponentViewController 



- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view from its nib. 
    self.chaNames = @[@"Luke",@"Leia",@"Han",@"Chewbacca",@"Artoo", @"Threepio",@"lando"]; 
} 



- (IBAction)buttonPressed:(id)sender { 

    NSInteger row = [self.singlePicker selectedRowInComponent:0]; 
    NSString *selected = self.chaNames[row]; 
    NSString *title = [[NSString alloc]initWithFormat:@"You slected %@", selected]; 

    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"OutPut is : " message:title delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; 

    [alert show]; 
} 

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView 
{ 
    return 1; 
} 
-(NSInteger)pickerView:(UIPickerView *)pickerView 
numberOfRowsInComponent:(NSInteger)component 
{ 
    return [self.chaNames count]; 
} 
-(NSString *)pickerView:(UIPickerView *)pickerView 
      titleForRow:(NSInteger)row 
      forComponent:(NSInteger)component 
{ 
    return[self.chaNames objectAtIndex:row]; 
} 


- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
{ 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
     // Custom initialization 
    } 
    return self; 
} 

- (void)didReceiveMemoryWarning 
{ 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 
@end

请帮助提前感谢:)

来源

2013-03-10 Happy

是选择器视图的数据源，并在所有被称为委托方法正确地把它挂？确保你设置了选择器视图的'dataSource'和'delegate'属性。 – rmaddy 2013-03-10 17:59:06

嗨，我设置了选择器视图的dataSource和委托属性，但仍然不起作用 – Happy 2013-03-10 18:03:54

正如我第一次问，数据源和委托方法是否被调用？在'numberOfComponentsInPickerView'中设置一个断点或者添加一个'NSLog'。 – rmaddy 2013-03-10 18:05:08

您需要的Alloc你NSArray的对象，如下所示：

self.chaNames = [NSArray alloc] initWithObjects:@"Luke",@"Leia",@"Han",@"Chewbacca",@"Artoo", @"Threepio",@"lando"];

编辑：

你还需要设置singlePicker.datasource =自我;和singlePicker.delegate = self;内的viewDidLoad或IB（包括委托和数据源）

-(void)viewDidLoad { 

    self.chaNames = [NSArray alloc] initWithObjects:@"Luke",@"Leia",@"Han",@"Chewbacca",@"Artoo", @"Threepio",@"lando"]; 
}

来源

2013-03-10 18:25:33 BarryK88

仍然无法运行 – Happy 2013-03-10 18:27:08

如果通过接口生成器进行连接，请确保连接数据源和委托。还要确保数据源和代理都在viewDidLoad中的.h文件 – BarryK88 2013-03-10 18:28:26

中提及，您还需要设置singlePicker.datasource = self;和singlePicker.delegate = self; – BarryK88 2013-03-10 18:29:19

数据没有显示在pickerView

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