如何将出生日期 UIDatePicker 添加到 UITextField？

Question

我在我的应用程序的注册屏幕上请求用户的出生日期。我不知道如何显示出生日期 UIDatePicker。我尝试使用以下代码，但它只显示日期和时间：

 UIDatePicker *dp = [[UIDatePicker alloc]init];
_textBirthday.inputView = dp;

另外，如何设置只接受特定年份之后出生的用户？

Answer 1

将 datePickerMode 设置为 UIDatePickerModeDate。

datePicker.datePickerMode = UIDatePickerModeDate;

Apple Docs: The date picker displays months, days of the month, and years. The exact order of these items depends on the locale setting. An example of this mode is [ November | 15 | 2007 ]. Available in iOS 2.0 and later.

Answer 2

1) 在您的视图控制器的 .h 文件中，确保您分配了文本字段委托：

@interface YourViewController : UIViewController <UITextFieldDelegate>

并且还有一个生日文本字段的 IBOutlet

2) 将日期选择器声明为 class 变量，以便可以从 class 中的所有不同方法访问它。在 .m 文件中，在导入之后和实施之前执行以下操作：

@interface YourViewController () {
UIDatePicker *datePicker;
}
@end

3) 在 viewdidload 中：

// make the textfield its own delegate
self.BirthdateTextfield.delegate = self;

// alloc/init your date picker, and (optional) set its initial date
datePicker = [[UIDatePicker alloc]init];
[datePicker setDate:[NSDate date]]; //this returns today's date

// theMinimumDate (which signifies the oldest a person can be) and theMaximumDate (defines the youngest a person can be) are the dates you need to define according to your requirements, declare them:

// the date string for the minimum age required (change according to your needs) 
NSString *maxDateString = @"01-Jan-1996";
// the date formatter used to convert string to date
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
// the specific format to use
dateFormatter.dateFormat = @"dd-MMM-yyyy";
// converting string to date
NSDate *theMaximumDate = [dateFormatter dateFromString: maxDateString];

// repeat the same logic for theMinimumDate if needed

// here you can assign the max and min dates to your datePicker 
[datePicker setMaximumDate:theMaximumDate]; //the min age restriction 
[datePicker setMinimumDate:theMinimumDate]; //the max age restriction (if needed, or else dont use this line)

// set the mode
[datePicker setDatePickerMode:UIDatePickerModeDate];

// update the textfield with the date everytime it changes with selector defined below
[datePicker addTarget:self action:@selector(updateTextField:) forControlEvents:UIControlEventValueChanged];

// and finally set the datePicker as the input mode of your textfield
[self.BirthdateTextfield setInputView:datePicker];

4) 在同一个 .m 文件中，定义每次日期选择器更改时将更新文本字段的选择器：

-(void)updateTextField:(id)sender {
    UIDatePicker *picker = (UIDatePicker*)self.BirthdateTextfield.inputView;
    self.BirthdateTextfield.text = [self formatDate:picker.date];
}

5) 最后但同样重要的是，这是在将日期分配给 textfield.text 之前调用的方法（textfield.text 需要字符串而不是日期）：

- (NSString *)formatDate:(NSDate *)date {
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateStyle:NSDateFormatterShortStyle];
    [dateFormatter setDateFormat:@"dd-MMM-yyyy"];
    NSString *formattedDate = [dateFormatter stringFromDate:date];
    return formattedDate;
}

享受编码吧！

Answer 3

使用下面的代码你会自动得到一个输出：

- (void)viewDidLoad {
[super viewDidLoad];

UIDatePicker *datePicker = [[UIDatePicker alloc]init];
[datePicker setDate:[NSDate date]];
datePicker.datePickerMode = UIDatePickerModeDate;
[datePicker addTarget:self action:@selector(dateTextField:) forControlEvents:UIControlEventValueChanged];
[self.dobTextField setInputView:datePicker];
}

-(void) dateTextField:(id)sender{
 UIDatePicker *picker = (UIDatePicker*)self.dobTextField.inputView;
[picker setMaximumDate:[NSDate date]];
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
NSDate *eventDate = picker.date;
[dateFormat setDateFormat:@"dd/MM/yyyy"];
NSString *dateString = [dateFormat stringFromDate:eventDate];
self.dobTextField.text = [NSString stringWithFormat:@"%@",dateString];
}

这是Swift 4代码：

override func viewDidLoad() {
    super.viewDidLoad()
  showDatePicker()
}

//MARK: Show Date Picker
func showDatePicker(){
    //Formate Date
    datePicker.datePickerMode = .date
    //ToolBar
    let toolbar = UIToolbar();
    toolbar.sizeToFit()
    //done button & cancel button
    let doneButton = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(donedatePicker))
    let spaceButton = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
    let cancelButton = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(cancelDatePicker))

    toolbar.setItems([cancelButton,spaceButton,doneButton], animated: false)

    // add toolbar to textField
    dateOfBirthTxtFldRef.inputAccessoryView = toolbar
    // add datepicker to textField
    dateOfBirthTxtFldRef.inputView = datePicker
}

@objc func donedatePicker(){
    //For date formate
    let formatter = DateFormatter()
    formatter.dateFormat = "dd MMMM yyyy"
    dateOfBirthTxtFldRef.text! = formatter.string(from: datePicker.date)
    //dismiss date picker dialog
    self.view.endEditing(true)
}

@objc func cancelDatePicker(){
    //cancel button dismiss datepicker dialog
    self.view.endEditing(true)
}

如何将出生日期 UIDatePicker 添加到 UITextField？

How do I add a date of birth UIDatePicker to UITextField?

date

objective-c

uitextfield

ios