Question

我试过这段代码：

-(IBAction)btn_strtPeriodclicked:(id)sender{
    UIDatePicker *datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, 250, 0, 0)];
    // ... populate your date picker and format it as you see fit.
    [self.view addSubview:datePicker];   
}

pickerView显示但颜色太浅。我的问题是：

如何正确显示选择器视图。
如何删除选择器视图。
如何在标签中显示日期。

Answer 1

您无法更改UIDatePicker。
您可以将其存储在属性中，当您需要将其从超级视图调用中删除[datePicker removeFromSuperview];

您需要一个日期格式化程序才能从日期获取字符串值。有人喜欢这样：

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateStyle:NSDateFormatterMediumStyle];
[dateFormatter setTimeStyle:NSDateFormatterShortStyle];

用日期设置标签：

self.dateLabel.text = [dateFormatter stringFromDate:datePicker.date];

Answer 2

-(IBAction)btn_strtPeriodclicked:(id)sender
    {
        UIDatePicker* datePicker1=[[UIDatePicker alloc]initWithFrame:CGRectMake(0, 290,  self.view.frame.size.width, 200)];
        datePicker1.datePickerMode = UIDatePickerModeDateAndTime;
        [self.view addSubview:datePicker1];
        datePicker1.hidden = NO;
        [datePicker1 addTarget:self 
        action:@selector(dateChange:)forControlEvents:UIControlEventValueChanged];
        NSDateFormatter *formate=[[NSDateFormatter alloc]init];
        [formate setDateFormat:@"dd-MMM-yy hh:mm a "];
    //set date too your lable here
        timeText1.text=[formate stringFromDate:datePicker1.date];
     }

-(void)dateChange:(id)sender
     {
             NSLog(@"date is %@",datePicker1.date);
             NSDateFormatter *formate=[[NSDateFormatter alloc]init];
             [formate setDateFormat:@"dd-MMM-yy hh:mm a "];
             timeText1.text=[formate stringFromDate:datePicker1.date];
     }

Answer 3

您必须为日期选择器创建视图，并在该视图中添加日期选择器，最初隐藏datepicker视图的框架

首先创建属性并使用IBOutlet连接.h

中的视图和日期选择器

@property (strong, nonatomic) IBOutlet UIView *datePickerView;
@property (strong, nonatomic) IBOutlet UIDatePicker *dobPicker;

和viewDIdload（）删除datepickerview

-(void)viewDidLoad()
{

[self.datePickerView removeFromSuperview];
}

当您执行操作时显示视图

- (IBAction)showDate
{
UIView *toView;

        self.datePickerView.tag =42;
        toView  =   self.datePickerView;
        toView.frame = CGRectMake(0, 210, 320, 206);
        [self.view addSubview:toView];
}

然后选择日期并将其转换为字符串以在标签中显示

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

[formatter setDateStyle:NSDateFormatterMediumStyle];
[formatter setDateFormat:@"dd-MMM-yyyy"];

NSDate *date = [self.dobPicker date];

self.label.text = [formatter stringFromDate:birthday];

隐藏在该datepickerview中添加另一个自定义视图和自定义按钮右键隐藏datepicker操作以再次删除视图。您的视图应如下所示，并为完成按钮 enter image description here

创建操作

- (IBAction)Done:(id)sender {
    for (UIView *view in [self.view subviews])
    {
        if (view.tag == 42 ) {
            [view removeFromSuperview];
        }
    }
}

1有关详细信息，请参阅此视频see this video

从datepicker获取日期并将其显示在标签中

3 个答案: