如何在选择日期后禁用UIDatePicker？

Question

我使用以下代码为UIDatePicker,无论选择它的日期是在标签中显示.但是我需要在选择日期后关闭选择器.这可能请建议我.

我使用以下代码:

- (void)viewDidLoad {
    [super viewDidLoad];

    //Create label
    label = [[UILabel alloc] init]; 
    label.frame = CGRectMake(10, 10, 300, 40);
    label.textAlignment = UITextAlignmentCenter;

    //Use NSDateFormatter to write out the date in a friendly format
    NSDateFormatter *df = [[NSDateFormatter alloc] init];
    df.dateStyle = NSDateFormatterMediumStyle;
    label.text = [NSString stringWithFormat:@"%@",
                  [df stringFromDate:[NSDate date]]];
    [df release];
    [self.view addSubview:label]; 
    [label release];

    // Initialization code
    datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, 250, 325, 250)];
    datePicker.datePickerMode = UIDatePickerModeDate;
    datePicker.hidden = NO;
    datePicker.date = [NSDate date];
    [datePicker addTarget:self
                   action:@selector(changeDateInLabel:)
         forControlEvents:UIControlEventValueChanged];
    [self.view addSubview:datePicker];
    [datePicker release];
}

- (void)changeDateInLabel:(id)sender{
    //Use NSDateFormatter to write out the date in a friendly format
    NSDateFormatter *df = [[NSDateFormatter alloc] init];
    df.dateStyle = NSDateFormatterMediumStyle;
    label.text = [NSString stringWithFormat:@"%@",
                  [df stringFromDate:datePicker.date]];
    [df release];
}   

Answer 1

我建议你做这样的事情:

使用带有完成按钮的工具栏,可能还有取消按钮......

这只是一个快速实现,它可能会有所帮助

UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(0, 100, 320, 44)];
textField.text         = @"Date";
[self.view addSubview:textField];

UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
toolbar.barStyle   = UIBarStyleBlackTranslucent;

UIBarButtonItem *itemDone  = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:textField action:@selector(resignFirstResponder)];
UIBarButtonItem *itemSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];

toolbar.items = @[itemSpace,itemDone];

UIDatePicker *datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, 0, 320, 216)];
datePicker.minimumDate   = [NSDate date];
datePicker.date          = [NSDate date];
[datePicker addTarget:self action:@selector(didChangePickerDate:) forControlEvents:UIControlEventValueChanged];

textField.inputAccessoryView = toolbar;
textField.inputView          = datePicker;

[textField becomeFirstResponder];