在我的应用程序的注册界面上,我需要请求用户的出生日期。我无法弄清楚如何显示一个UIDatePicker
来获取出生日期。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;
此外,我如何设置它,使其仅接受在特定年份之后出生的用户?
在我的应用程序的注册界面上,我需要请求用户的出生日期。我无法弄清楚如何显示一个UIDatePicker
来获取出生日期。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;
1)在你的视图控制器(.h文件)中,确保你分配了文本框委托:
@interface YourViewController : UIViewController <UITextFieldDelegate>
同时还需要在生日文本字段中拥有一个IBOutlet。
2) 将日期选择器声明为类变量,以使其可以从类中的所有不同方法中访问。在导入之后,在.m文件中实现以下操作:
@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.m文件中,定义选择器,以便在日期选择器更改时更新文本字段:
-(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需要一个字符串而不是日期):
- (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!
- (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];
}
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)
}
datePickerMode
设置为UIDatePickerModeDate
。datePicker.datePickerMode = UIDatePickerModeDate;
Apple Docs:日期选择器显示月份、每月的天数和年份。这些项目的确切顺序取决于区域设置。此模式的示例为 [ November | 15 | 2007 ]。适用于 iOS 2.0 及更高版本。
UIDatePicker
的minimumData
属性是什么? - Larme