2 UIPickerViews每個都有自己的UILabel來顯示NSMutableArray的值

Question

我在我的視圖中有2個UIPickerViews和兩個UILabels，並且UIPickerViews是用NSMutableArray中的數字填充的。

挑選者需要將選擇的值發送給那裏指定的標籤。例如：

_pickerView1（選擇了 「18」） _pickerOutputLabel1（顯示 「18」）

_pickerView2（選擇了 「7」） _pickerOutputLabel2（顯示 「7」）

我不能得到這個工作時，_pickerView2也會將其值發送到_pickerOutputLabel1而不是_pickerOutputLabel2。

我已經嘗試了幾件事，但我無法弄清楚如何得到它的工作。

這是代碼（我打消了我的努力來解決這個問題，使之ATLEAST編譯:)

//頭文件

#import <UIKit/UIKit.h> 



@interface UIPickerViewAndLabelsViewController : UIViewController <UIPickerViewDelegate, UIPickerViewDataSource> { 


NSMutableArray *nrArray; 
IBOutlet UIPickerView *_pickerView1; 
IBOutlet UIPickerView *_pickerView2; 

UILabel *_pickerOutputLabel1; 
    UILabel *_pickerOutputLabel2; 

} 
@property (nonatomic, retain) IBOutlet UIPickerView *pickerView1; 
@property (nonatomic, retain) IBOutlet UIPickerView *pickerView2; 
@property (nonatomic, retain) IBOutlet UILabel *pickerOutputLabel1; 
@property (nonatomic, retain) IBOutlet UILabel *pickerOutputLabel2; 
@end 

//實現文件

#import "UIPickerViewAndLabelsViewController.h" 

@implementation UIPickerViewAndLabelsViewController 

@synthesize pickerView1 = _pickerView1; 
@synthesize pickerView2 = _pickerView2; 
@synthesize pickerOutputLabel1 = _pickerOutputLabel1; 
@synthesize pickerOutputLabel2 = _pickerOutputLabel2; 

/* 
// The designated initializer. Override to perform setup that is required before the view is loaded. 
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
     // Custom initialization 
    } 
    return self; 
} 
*/ 


// Implement loadView to create a view hierarchy programmatically, without using a nib. 
/* 
- (void)loadView { 
} 
*/ 



// Implement viewDidLoad to do additional setup after loading the view, typically from a nib. 
- (void)viewDidLoad { 

_pickerOutputLabel1 = [[UILabel alloc]initWithFrame:CGRectMake(400, 120, 50, 50)]; 
[self.view addSubview:_pickerOutputLabel1]; 

_pickerOutputLabel2 = [[UILabel alloc]initWithFrame:CGRectMake(400, 320, 50, 50)]; 
[self.view addSubview:_pickerOutputLabel2]; 

nrArray = [[NSMutableArray alloc] init]; 

for (int i=0;i<20+1;i++) { 

    [nrArray addObject:[NSString stringWithFormat:@"%d", i]]; 
} 



_pickerView1 = [[UIPickerView alloc] initWithFrame:CGRectMake(500, 120, 100, 162)]; 


_pickerView1.delegate = self; 
_pickerView1.dataSource = self; 
_pickerView1.showsSelectionIndicator = YES; 
_pickerView1.transform = CGAffineTransformMakeScale(0.8, 0.8); 
[self.view addSubview:_pickerView1]; 
[_pickerView1 release]; 
[_pickerView1 selectRow:0 inComponent:0 animated:NO]; 

_pickerOutputLabel1.text = [nrArray objectAtIndex:[_pickerView1 selectedRowInComponent:0]]; 


_pickerView2 = [[UIPickerView alloc] initWithFrame:CGRectMake(500, 320, 100, 162)]; 


_pickerView2.delegate = self; 
_pickerView2.dataSource = self; 
_pickerView2.showsSelectionIndicator = YES; 
_pickerView2.transform = CGAffineTransformMakeScale(0.8, 0.8); 
[self.view addSubview:_pickerView2]; 
[_pickerView2 release]; 
[_pickerView2 selectRow:0 inComponent:0 animated:NO]; 

_pickerOutputLabel2.text = [nrArray objectAtIndex:[_pickerView2 selectedRowInComponent:0]]; 


    [super viewDidLoad]; 
} 







- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)_pickerView1; 
{ 
    return 1; 
} 


- (void)pickerView:(UIPickerView *)_pickerView1 didSelectRow:(NSInteger)row inComponent:(NSInteger)component 
{ 
    _pickerOutputLabel1.text= [nrArray objectAtIndex:row]; 
} 

- (NSInteger)pickerView:(UIPickerView *)_pickerView1 numberOfRowsInComponent:(NSInteger)component; 
{ 
    return [nrArray count]; 
} 

- (NSString *)pickerView:(UIPickerView *)_pickerView1 titleForRow:(NSInteger)row forComponent:(NSInteger)component; 
{ 
    return [nrArray objectAtIndex:row]; 

} 








// Override to allow orientations other than the default portrait orientation. 
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { 
    return YES; 
} 

- (void)didReceiveMemoryWarning { 
    // Releases the view if it doesn't have a superview. 
    [super didReceiveMemoryWarning]; 

    // Release any cached data, images, etc that aren't in use. 
} 

- (void)viewDidUnload { 
    // Release any retained subviews of the main view. 
    // e.g. self.myOutlet = nil; 
} 


- (void)dealloc { 
    [super dealloc]; 
} 

@end 

我我嘗試了3天，然後卡住了。

在此先感謝。

Answer 1

在UIPickerView委託方法中，您已將pickerView參數命名爲「_pickerView1」。將該參數命名爲與實例變量不相同表示僅爲該選取器調用委託方法。它只是成爲任何選擇器調用委託方法的本地名稱。

由於您已將代理人設置爲兩個代理人都是自己的，因此兩個代答人都調用相同的方法。

說哪個選擇器正在通話，一對夫婦的方法是：

• 創建時將它們設置不同的標記值，爲每一位檢查的委託方法的標籤（例如_pickerView1.tag = 1;和。在委託方法中：if (pickerView.tag == 1)...）

• 或者，直接比較實例變量。例如：

  - (void)pickerView:(UIPickerView *)pickerView //<-- std name as in doc 
        didSelectRow:(NSInteger)row inComponent:(NSInteger)component 
  { 
      if (pickerView == _pickerView1) 
        // Above: 
        // "pickerView" is the picker in which a row was selected 
        // "_pickerView1" is the actual instance variable 
       _pickerOutputLabel1.text = [nrArray objectAtIndex:row]; 
      else 
       _pickerOutputLabel2.text = [nrArray objectAtIndex:row]; 
  } 
  

此外，你必須IBOutlet在控件聲明的前面，但然後您以編程方式創建它們。如果您使用Interface Builder創建控件，請勿在代碼中重新創建它們。如果您不使用IB，請刪除IBOutlet。

Answer 2

，你也可以使用這個： - （空）pickerView：（UIPickerView *）pickerView didSelectRow：（NSInteger的）行inComponent：（NSInteger的）組件 {

if([pickerView isEqual: picker ]){ 
    firststr = [firstArray objectAtIndex:row]; 
} 



if([pickerView isEqual: pickerAnother ]){ 

    secondstr = [secondArray objectAtIndex:row]; 


} 

}