Picker View只在文本框中選擇NSArray中的第一個對象

Question

我試圖學習如何從一個選擇器視圖中選擇一個對象以顯示在一個TextBox中，六個小時之後我以爲id最終破解了但沒有。它的工作原理，但我只能讓我的NSArray中的第一個項目顯示在我的文本框中。

Select是我的選擇器，arrstatus是我的NSArray，text1是我的文本框。

使用按鈕來獲得自己的價值：IBAction爲下：

NSInteger selectedRow = [select selectedRowInComponent:0]; 
text1.text = [arrStatus objectAtIndex:selectedRow]; 
    [text1 resignFirstResponder]; 

的代碼休息：

.H

@interface pick5 : UIViewController <UIPickerViewDataSource,  UIPickerViewDelegate,UITextFieldDelegate> 

{ 

UIPickerView *select; 

NSArray *arrStatus; 


} 

.M

UIPickerView *select = [[UIPickerView alloc] initWithFrame:CGRectZero]; 
select.delegate = self; 
select.dataSource = self; 
[select setShowsSelectionIndicator:YES]; 
text1.inputView = select; 

arrStatus = [[NSArray alloc] initWithObjects:@"bs88", @"bs60898", @"Memphis",  @"California", @"Seattle",@"London",@"Paris", nil]; 
} 
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView 
{ 
//One column 
    return 1; 
} 

-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component 
{ 
//set number of rows 
return arrStatus.count; 
    } 

-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component 
{ 
//set item per row 
return [arrStatus objectAtIndex:row]; 













[super viewDidLoad]; 
// Do any additional setup after loading the view. 
} 

- (void)viewDidUnload 
{ 
[self setText1:nil]; 
[self setResign:nil]; 
[self setText2:nil]; 
[super viewDidUnload]; 
// Release any retained subviews of the main view. 
} 

- (BOOL)shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)interfaceOrientation 
{ 
return (interfaceOrientation == UIInterfaceOrientationPortrait); 
} 





- (IBAction)resign:(id)sender { 


NSInteger selectedRow = [select selectedRowInComponent:0]; 
text1.text = [arrStatus objectAtIndex: selectedRow]; 
[text1 resignFirstResponder]; 
} 
@end 

IM也得到黃色警告三角s local decalration of "select" hides instance variable

Answer 1

對於黃色警告，請在.m文件中更改以下代碼行。

UIPickerView *select = [[UIPickerView alloc] initWithFrame:CGRectZero]; 

低於上述替換：

select = [[UIPickerView alloc] initWithFrame:CGRectZero]; 

，因爲你已經宣佈uipicker *選擇.h文件中。