如果用户以编程方式点击UITextfield,如何显示UIDatePicker

Question

我想仅在用户单击UITextField时才显示UIDatePicker.选择日期时,它应该显示在同一个UITextField中.我想以编程方式实现UIDatePicker.我知道如何以编程方式编写UITextField的代码.我甚至不知道如何调用UIDatePicker.

出生日期.m

UITextField txtDOB=[[UITextField alloc]initWithFrame:CGRectMake(10, 190, 300, 20)];

txtDOB.borderStyle=UITextBorderStyleNone;

txtDOB.backgroundColor=[UIColor clearColor];

[txtDOB setUserInteractionEnabled:NO];

txtDOB.font=[UIFont systemFontOfSize:14.0];

txtDOB.contentVerticalAlignment=UIControlContentVerticalAlignmentCenter;

txtDOB.textAlignment=NSTextAlignmentLeft;

txtDOB.delegate=self;

[self.view addSubview:txtDOB];

Answer 1

最简单的方法是实现datePicker如下:

创建 datePicker:

self.datePicker = [[UIDatePicker alloc] initWithFrame:CGRectZero];
[self.datePicker setDatePickerMode:UIDatePickerModeDate];
[self.datePicker addTarget:self action:@selector(onDatePickerValueChanged:) forControlEvents:UIControlEventValueChanged];

然后链接datePicker到textfieldinputView:

self.textField.inputView = self.pickerView;

最后,您可以在选择日期时捕获操作,并将日期转换为字符串,以显示日期中的所选日期 textField

- (void)onDatePickerValueChanged:(UIDatePicker *)datePicker
{
    self.textField.text = [self.dateFormatter stringFromDate:datePicker.date];
}

Answer 2

    UIDatePicker *picker1   = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, 210, 320, 216)];
    [picker1 setDatePickerMode:UIDatePickerModeDate];
    picker1.backgroundColor = [UIColor whiteColor];
    [picker1 addTarget:self action:@selector(startDateSelected:) forControlEvents:UIControlEventValueChanged];

//    [picker1 addSubview:toolBar];
    self.birthTxt.inputView  = picker1; // Here birthTxt is Textfield Name replace with your name

Answer 3

当在 UITexfield 上开始编辑时，您需要添加适当的选择器，使用下面的代码

 [txtDOB addTarget:self action:@selector(textbeginEditing:) forControlEvents:UIControlEventEditingDidBegin];

然后实现textbeginEditing方法来打开日期选择器。

-(void)textbeginEditing:(id)sender{

UIActionSheet __autoreleasing * date_sheet = [[UIActionSheet alloc] initWithTitle:@"Select the date" delegate:nil cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil];

date_sheet.tag = 2;

[date_sheet setActionSheetStyle:UIActionSheetStyleBlackTranslucent];

CGRect pickerFrame = CGRectMake(0, 40, 0, 0);

UIDatePicker *datePicker = [[UIDatePicker alloc] initWithFrame:pickerFrame];

datePicker.datePickerMode = UIDatePickerModeDate;
datePicker.hidden = NO;
datePicker.date = [NSDate date];

// Implement the method labelChange
 [datePicker addTarget:self
                action:@selector(labelChange:)
      forControlEvents:UIControlEventValueChanged];


[date_sheet addSubview:datePicker];

UISegmentedControl __autoreleasing *closeButton = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObject:@"Close"]];

closeButton.momentary = YES;    
closeButton.frame = CGRectMake(260, 7.0f, 50.0f, 30.0f);    
closeButton.segmentedControlStyle = UISegmentedControlStyleBar;    
closeButton.tintColor = [UIColor blackColor];

[closeButton addTarget:self action:@selector(dissmissDatePicker:) forControlEvents:UIControlEventValueChanged];

[date_sheet addSubview:closeButton];
[date_sheet showInView:[[UIApplication sharedApplication] keyWindow]];    
[date_sheet setBounds:CGRectMake(0, 0, 320, 400)];
}

labelChange方法实现

-(void)labelChange:(UIDatePicker *)sender{
NSDateFormatter __autoreleasing *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setTimeZone:[NSTimeZone systemTimeZone]];
[dateFormat setDateFormat:@"YYYY-MM-dd HH:mm:ss"];
 dateFormat.dateStyle = NSDateFormatterMediumStyle;
 NSString *dateString =  [dateFormat stringFromDate:sender.date];
 txtDOB.text = dateString; 
}