UIPickerView顯示錯誤的標題

我的應用程序是一個具有多組件拾取器轉輪的轉換器。它用於轉換一些變量。你可以看到的數字只是爲了測試，沒有什麼重要的。UIPickerView顯示錯誤的標題

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    _convertFrom = @[@"One (1)", @"Two (2)", 
    @"Three (3)", @"Four (4)", @"Five (5)"]; 

    _convertRates = @[ @1.0f, @2.0f, @3.0f, 
    @4.0f, @5.0f]; 

    _convertTo = @[@"One (1)", @"Two (2)", 
    @"Three (3)", @"Four (4)", @"Five (5)"]; 

_convertRates = @[ @1.0f, @2.0f, @3.0f, 
@4.0f, @5.0f]; 

}

我有一個小問題，當我在iOS 6模擬器中測試應用程序時顯示的數字。正如你可以在這裏看到：

Screenshot

http://imgur.com/q4uxm

當我嘗試下井名單，數量的變化。但是它們的價值卻沒有。如果有人一定要檢查一下，也許找到一個解決方案，將是非常有益的:)

這裏是代碼的其餘部分可能是在這種情況下，重要的時間：

#pragma mark - 
#pragma mark PickerView DataSource 

- (NSInteger)numberOfComponentsInPickerView: 
(UIPickerView *)pickerView 
{ 
return 2; 
} 

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent: (NSInteger)component 
{ 
if (component == 0) { 
    return [_convertFrom count]; 
} 
return [_convertTo count]; 
} 


- (NSString *) pickerView: (UIPickerView *)pickerView 
      titleForRow:(NSInteger)row 
     forComponent:(NSInteger)component 
{ 
if (component == 0) { 
    return [_convertFrom objectAtIndex:[pickerView selectedRowInComponent:0]]; 
} 
return [_convertTo objectAtIndex:[pickerView selectedRowInComponent:1]]; 
} 




#pragma mark - 
#pragma mark PickerView Delegate 
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row 
    inComponent:(NSInteger)component 
{ 
    float convertFrom = [[_convertRates objectAtIndex:[pickerView selectedRowInComponent:0]] floatValue]; 
float convertTo = [[_convertRates objectAtIndex:[pickerView selectedRowInComponent:1]] floatValue]; 
float input = [dollarText.text floatValue]; 
float to = convertTo; 
float from = convertFrom; 
float dollars = input; 
float result = to * from * dollars; 
float mtpaTilMtpaFloat = dollars * 1; 
NSString *resultString = [[NSString alloc] initWithFormat: 
          @"result = %.2f * %.2f = %.2f", from, to, result]; 
resultLabel.text = resultString; 

NSString *mtpaTilmtpa = [[NSString alloc ] initWithFormat: 
          @" %.2f MTPA = %.2f MTPA", dollars, mtpaTilMtpaFloat]; 



if (from == 1, to == 1) { resultLabel.text = mtpaTilmtpa; 
}

而且當然，告訴我是否需要顯示更多的代碼，以便了解它。它是我第一次使用這個網站btw :)

來源

2012-10-12 OleB

不使用selectedRowInComponent。您不希望顯示所有行中選定的值。只需使用row

- (NSString *) pickerView: (UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component 
{ 
    if (component == 0) { 
     return [_convertFrom objectAtIndex:row]; 
    } 
    return [_convertTo objectAtIndex:row]; 
}

來源

2012-10-12 21:57:22

UIPickerView顯示錯誤的標題

回答

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