使用选取器视图在textfield中的默认值

Question

我是 iOS 的新手我需要使用 objectAtIndex(0) <在 textfield 中显示uipickerview / em> .while在选择器视图中选择后运行应用程序文本字段为空只有值可以在textfield中显示我需要最初textfield不为空。

viewdidload 代码：

    pktStatePicker  .delegate = self;

    pktStatePicker  .dataSource = self;

    [ pktStatePicker  setShowsSelectionIndicator:YES];

    txtText.inputView =  pktStatePicker  ;

    // Create done button in UIPickerView


    UIToolbar*  mypickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 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];


    txtText.inputAccessoryView = mypickerToolbar;

选择器视图委托：

- (void) pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component

{
     NSLog([arrmsg1 objectAtIndex:row]);
    txtText.text = (NSString *)[arrMsg objectAtIndex:row];

}

Answer 1

在ViewDidLoad上设置，但请确保arrMsg.count!=0

- (void)viewDidLoad
{
[super viewDidLoad];
txtText.text = (NSString *)[arrMsg objectAtIndex:0];
}

<强>选择-2

或者在该调用之后将数据附加到arrMsg中，如

if (arrMsg.count >0)
{
txtText.text = (NSString *)[arrMsg objectAtIndex:0];
}

继续你的工作之后