pickerview selectedRowInComponent總是返回0

我使用selectedRowInComponent方法與指標0取得有關組件當前選擇的行，但它總是返回0。我已經在pickerview selectedRowInComponent總是返回0

NSLog("%d",[pickerview selectedRowInComponent:0]);

檢查的話我已經初始化撿拾工具，因爲我我以編程方式使用選取器視圖。請建議。

來源

2012-09-22 Arvind

也許pickerview ==零則selectedRowInComponent將是0，也沒有 – NeverBe

它不是零：該類檢測第二線將檢索pickerview。當我們在控制檯中打印它。它正在響應類名稱和幀大小。 – Arvind

您是否將變量連接到插座？你使用多少個採樣器？ – NeverBe

我希望這段代碼能幫助你。我在我的項目中使用它，它的工作非常完美。

調用此函數它的viewDidLoad

[self loadFirstPicker];

下面是功能，使UIpicker其中僅顯示時間。（和文本中費爾德保存）

-(void)loadFirstPicker 
{ 
    UIDatePicker *picker = [[UIDatePicker alloc] init]; 
    picker.autoresizingMask = UIViewAutoresizingFlexibleWidth; 
    picker.datePickerMode = UIDatePickerModeTime; 

    [picker addTarget:self action:@selector(dueDateChanged:) forControlEvents:UIControlEventValueChanged]; 
    CGSize pickerSize = [picker sizeThatFits:CGSizeZero]; 
    picker.frame = CGRectMake(0.0, 250, pickerSize.width, 460); 
    picker.backgroundColor = [UIColor blackColor]; 
    checkEveryTextFeild.inputView = picker; 

    //[self.view addSubview:picker]; 
    //[picker release]; 

    // Create done button in UIPickerView 
    UIToolbar* mypickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 220, 56)]; 
    mypickerToolbar.barStyle = UIBarStyleBlackOpaque; 
    [mypickerToolbar sizeToFit]; 

    NSMutableArray *barItems = [[NSMutableArray alloc] init]; 

    UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil]; 
    [barItems addObject:flexSpace]; 

    UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(pickerDoneClicked)]; 
    [barItems addObject:doneBtn]; 

    [mypickerToolbar setItems:barItems animated:YES]; 
    checkEveryTextFeild.inputAccessoryView = mypickerToolbar; 
}

這一功能正從拾取時間，將其設置爲textFeild

-(void) dueDateChanged:(UIDatePicker *)sender { 

    NSDateFormatter* dateFormatter = [[[NSDateFormatter alloc] init] autorelease]; 
    [dateFormatter setDateFormat:@"HH:mm:ss"]; 
    //[dateFormatter setTimeStyle:NSDateFormatterNoStyle]; 

    checkEveryTextFeild.text = [dateFormatter stringFromDate:[sender date]]; 
    NSDate *currentDate = [NSDate date]; 
    NSLog(@"%@",currentDate); 
    NSLog(@"Picked the date %@", [dateFormatter stringFromDate:[sender date]]); 

}

來源

2012-09-22 22:56:19

你可能想嘗試設置他們兩個。

[filterPicker selectRow:selectedPickerIndex inComponent:0 animated:NO]; 

[self pickerView:filterPicker didSelectRow:selectedPickerIndex inComponent:0]; 

self.personInfoPicker.delegate = self; 
self.personInfoPicker.dataSource = self; 
[self.personInfoPicker reloadAllComponents];

來源

2013-09-05 20:28:17 kevinl

pickerview selectedRowInComponent總是返回0

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