how to show datetimepicker and set the chosen value in textfield - ios

Question

hi i am new to iphone programming .This program i will be doing for iphone so i want help. My question is by clicking a button can date picker appear and the when the date is chosen , i want it to be stored in a text field.How it can be done . kindly help me.I shall be very thankful to you. i had a button on which i want to show a date time picker how it can be done ?
below is my try code but it is not working just showing black screen.
- (IBAction)date:(id)sender {
UIDatePicker* picker = [[UIDatePicker alloc] init];
picker.autoresizingMask = UIViewAutoresizingFlexibleWidth;
picker.datePickerMode = UIDatePickerModeDate;
[picker addTarget:self action:#selector(dueDateChanged:) forControlEvents:UIControlEventValueChanged];
CGSize pickerSize = [picker sizeThatFits:CGSizeZero];
picker.frame = CGRectMake(0.0, 250, pickerSize.width, 460);
picker.backgroundColor = [UIColor blackColor];
[self.view addSubview:picker];
// [picker release];
}
-(void) dueDateChanged:(UIDatePicker *)sender {
NSDateFormatter* dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateStyle:NSDateFormatterLongStyle];
[dateFormatter setTimeStyle:NSDateFormatterNoStyle];
//self.myLabel.text = [dateFormatter stringFromDate:[dueDatePickerView date]];
NSLog(#"Picked the date %#", [dateFormatter stringFromDate:[sender date]]);
}

Answer 1

Your CGSizeZero is probably causing your date picker to not show.
This is how I do it in a simple way:
.H file
#interface ViewController : UIViewController
#property (nonatomic, strong) UIDatePicker *datePicker;
#property (nonatomic, strong) UITextField *textField;
#property (nonatomic, strong) UIButton *btnShowPicker;
#end
.M file
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self initViews];
}
-(void)initViews
{
self.datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, 20, 280, 200)];
// hide date picker at first
self.datePicker.alpha = 0;
self.textField = [[UITextField alloc] initWithFrame:CGRectMake(20, self.datePicker.frame.origin.y + self.datePicker.frame.size.height + 20, self.view.frame.size.width - 40.0, 35)];
self.textField.layer.borderWidth = 1.0;
self.textField.layer.borderColor = [UIColor grayColor].CGColor;
self.textField.textAlignment = NSTextAlignmentCenter;
self.btnShowPicker = [[UIButton alloc] initWithFrame:CGRectMake(20, self.view.bounds.size.height - 140.0, self.view.frame.size.width - 40.0, 50.0)];
[self.btnShowPicker setTitle:#"Show Date Picker" forState:UIControlStateNormal];
self.btnShowPicker.backgroundColor = [UIColor blueColor];
[self.btnShowPicker addTarget:self action:#selector(showDatePicker:) forControlEvents:UIControlEventTouchUpInside];
self.btnDone = [[UIButton alloc] initWithFrame:CGRectMake(self.btnShowPicker.frame.origin.x, self.btnShowPicker.frame.origin.y + self.btnShowPicker.frame.size.height + 10.0, self.btnShowPicker.frame.size.width, self.btnShowPicker.frame.size.height)];
self.btnDone.backgroundColor = [UIColor greenColor];
[self.btnDone setTitle:#"Done" forState:UIControlStateNormal];
[self.btnDone addTarget:self action:#selector(datePicked) forControlEvents:UIControlEventTouchUpInside];
self.btnDone.alpha = 0;
[self.view addSubview:self.datePicker];
[self.view addSubview:self.textField];
[self.view addSubview:self.btnShowPicker];
[self.view addSubview:self.btnDone];
}
-(void)showDatePicker:(id)sender
{
self.datePicker.alpha = 1.0;
self.btnDone.alpha = 1.0;
}
-(void)datePicked
{
if(self.datePicker.alpha != 0)
{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"dd/MM/yyyy HH:mm:ss"];
// populate the text field with new date
self.textField.text = [dateFormatter stringFromDate:self.datePicker.date];
}
}
Now when you scroll the date picker, you get the date populated in your text field like this: