如何更改標籤上的日期選擇器選定值

Question

我想在標籤上顯示datepicker中的選定日期，但標籤只顯示當前日期，它不顯示我從datepicker中選擇的日期這是代碼友好告訴我怎樣可以與任意選擇的日期從日期選擇器

#import "ViewController.h" 

@implementation ViewController 
@synthesize datepicker,mylabel; 


- (void)didReceiveMemoryWarning 
{ 
    [super didReceiveMemoryWarning]; 
    // Release any cached data, images, etc that aren't in use. 
} 

#pragma mark - View lifecycle 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    NSDate *chosen = datepicker.date; 
    NSDateFormatter *formatter = [[NSDateFormatter alloc]init]; 
    formatter.dateStyle = NSDateFormatterMediumStyle; 
    mylabel.text = [formatter stringFromDate:chosen]; 
    [formatter release];  

    // Do any additional setup after loading the view, typically from a nib. 

} 

- (void)viewDidUnload 
{ 

    [super viewDidUnload]; 
    // Release any retained subviews of the main view. 
    // e.g. self.myOutlet = nil; 
} 

- (void)viewWillAppear:(BOOL)animated 
{ 
    [super viewWillAppear:animated]; 
} 

- (void)viewDidAppear:(BOOL)animated 
{ 
    [super viewDidAppear:animated]; 
} 

- (void)viewWillDisappear:(BOOL)animated 
{ 
    [super viewWillDisappear:animated]; 
} 

- (void)viewDidDisappear:(BOOL)animated 
{ 
    [super viewDidDisappear:animated]; 
} 

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{ 
    // Return YES for supported orientations 
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown); 
} 

@end 

Answer 1

// code for Date picker for current date 

    datepicker=[[UIDatePicker alloc]initWithFrame:CGRectMake(0, 200, 320, 150)]; 
     //[self.view addSubview:datepicker]; 
     datepicker.date = [NSDate date]; 
     datepicker.datePickerMode=UIDatePickerModeDate; 
     NSDateFormatter *df = [[NSDateFormatter alloc] init]; 
     df.timeStyle = NSDateFormatterNoStyle; 

     label.text=[NSString stringWithFormat:@"%@", 
        [df stringFromDate:[NSDate date]]]; 
     df.dateFormat = @"yyyy-MM-dd"; 

    // set action for date picker 

     [datepicker addTarget:self action:@selector(DateChange:) 
      forControlEvents:UIControlEventValueChanged]; 

    //method for change date 

    - (void)DateChange:(id)sender 
{ 
     NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; 
     [dateFormatter setDateFormat:@"dd-MM-yyyy"]; 
     label.text = [dateFormatter stringFromDate:datepicker.date]; 
     date.text=strDate; 
} 

更改文本標籤