如何在选择日期后禁用UIDatePicker？

Question

我正在为 UIDatePicker 使用以下代码，无论我选择的日期是什么，它都会显示在标签中。但我需要在选择日期后关闭选择器。这可能吗请建议我。

我正在使用以下代码：

- (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

我建议您执行以下操作：

使用带有“完成”按钮和“取消”按钮的工具栏
...

这只是一个快速实施，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];

Answer 2

您必须使用按钮单击背景才能从您的视图中隐藏 DATEPICKER。

-(IBAction)backGroundClick:(id)sender
{
    [datePicker removeFromSuperview];
}

Answer 3

也许比从超级视图中删除更好的是将 userInteraction 设置为 NO
并且您需要“完成”按钮，就像用户准备好完成选择日期的地方一样

-(IBAction)buttonDoneClick:(id)sender
{
    [datePicker setUserInteractionEnabled:NO];
}

Answer 4

以下代码将起作用。
点击日期标签将启用 DatePicker，如下所示：

- (void)viewDidLoad
{
    [super viewDidLoad];


    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]init];
    tap.numberOfTapsRequired = 1;

    label = [[UILabel alloc] init];
    label.frame = CGRectMake(10, 20, 300, 40);
    label.userInteractionEnabled = YES;
    label.textAlignment = NSTextAlignmentCenter;
    label.backgroundColor = [UIColor redColor];
    NSDateFormatter *df = [[NSDateFormatter alloc] init];
    df.dateStyle = NSDateFormatterMediumStyle;
    label.text = [NSString stringWithFormat:@"%@",
                  [df stringFromDate:[NSDate date]]];
    [label addGestureRecognizer:tap];
    [tap addTarget:self action:@selector(datePickerView)];

    [self.view addSubview:label];


}

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


- (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]];

}

使用以下方法，点击 Picker 外部时，Picker 将从视图中退出。

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [datePicker removeFromSuperview];
}