iOS 中的日期選擇器控制器

Question

我想在我的應用程序中使用日期選擇器。 但是當我從日期選擇器中選擇日期而不是顯示異常的代碼時，異常是

[AppointmentViewController PickerAction:]: 無法識別的選擇器發送到實例 0x7fbbfa5f9d60'

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

[dateFormatter setDateFormat:@"dd-MM-yyyy"];

NSString *formatedDate = [dateFormatter stringFromDate:self.DatePicker.date];

self.SelectedDate.text =formatedDate;
self. DatePicker.hidden=NO;

Answer 1

您必須為日期選擇器實現選擇器方法，如下所示：

UIDatePicker *myPicker = [[UIDatePicker alloc] init];

myPicker.datePickerMode = UIDatePickerModeDate;
myPicker.minimumDate = [NSDate dateWithTimeIntervalSince1970:0];
myPicker.maximumDate = [NSDate date];
[myPicker addTarget:self action:@selector(datePickerValueChanged:)
 forControlEvents:UIControlEventValueChanged];
 NSDate *mydate = myPicker.date;
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:@"dd/MM/yyyy"];
[self.txtDOB setInputView:myPicker];

• (void)datePickerValueChanged:(id)sender{ UIDatePicker *picker = (UIDatePicker *)sender; NSString *dateString;

  NSDate *mydate = picker.date; NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init]; [dateFormatter setDateFormat:@"dd/MM/yyyy"]; dateString = [dateFormatter stringFromDate:mydate]; [self.txtDOB setText:dateString]; }