在文本字段点击上显示datepicker

Question

I'm very new to iOS so obviously I'm missing a few concepts when trying to follow this solution Display datepicker on tapping on textfield to my problem.

I have the interface and implementation in a class called DatepickerAppDelegate, but I'm lost here:

"In the XIB, Pull out a UIToolbar and a UIDatePicker but don't attach it to the view. Connect the outlets appropriately. dateChanged: responds to changes in the date picker and doneEditing: is called when the Done button in the tool bar is clicked. Connect them too. The methods are implemented as listed below."

I read something about XIB's but I'm using a storyboard, so I think I don't have then. Also, I'm not sure how I'm supposed to pull out elements without attaching it to my view controllers (I'm trying, but when I release the mouse button, the tool flies back to the toolbar), and I don't even understand why I need a UIToolbar.

And finally, how do I connect my textfield to the datepicker delegate?

Can someone help me?

UPDATE:

In fact it is very simple, I just need to:

datePicker = [[UIDatePicker alloc] init];
datePicker.datePickerMode = UIDatePickerModeDate;
[datePicker addTarget:self action:@selector(datePickerValueChanged:) forControlEvents:UIControlEventValueChanged];

self.birthday.inputView = datePicker;

Answer 1

UIResponder , from which UITextField inherits, defines a property called inputView . This property (a UIView * ) can define a view that will be displayed instead of the keyboard when that UIResponder becomes the first responder.

Thus, if you want a UIDatePicker to appear when you tap in a textField (ie, you make that textField the first responder), then you can say, naïvely:

UIDatePicker *datePicker = [[UIDatePicker alloc] init...];
... configure datePicker ...

[myTextField setInputView:datePicker];

Now, when your UITextField is tapped, a UIDatePicker will be brought up instead.

HOWEVER

You'll want to do more than this, because you'll need to handle different orientations and different idioms.

But that's the basic idea.

(And if you want a toolbar above the UIDatePicker , that's what the inputAccessoryView property is for...)

Answer 2

In viewDidLoad of ViewController.m

- (void)viewDidLoad {
    [super viewDidLoad];

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

Add one method in your ViewController

-(void) dateTextField:(id)sender
{
    UIDatePicker *picker = (UIDatePicker*)txtFieldBranchYear.inputView;
    [picker setMaximumDate:[NSDate date]];
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    NSDate *eventDate = picker.date;
    [dateFormat setDateFormat:@"dd/MM/yyyy"];

    NSString *dateString = [dateFormat stringFromDate:eventDate];
    txtFieldBranchYear.text = [NSString stringWithFormat:@"%@",dateString];
}

txtFieldBranchYear is an outlet of UITextField

Answer 3

Add a datepicker view and uitoolbarview to your view. For example

CGFloat toolbarHeight = 44.f;
CGFloat datePickerHeight = 140.f;
CGFloat containerViewHeight = toolbarHeight+datePickerHeight;
//create container view for datepicker and toolbar
UIView *containerView = [[UIVIew alloc] initWithFrame:CGRectMake(0.f, [self.view bounds].size.height+containerViewHeight, [self.view bounds].size.width, containerViewHeight)];

//after init toolbar set the frame
toolBar.frame = CGRectMake(0.f,0.f,containerView.frame.size.width, toolbarHeight];
//then add on toolbar button save and release it after add

//after init datePicker set the frame
datePicker.frame = CGRectMake(0.f, toolbarHeight, containerView.frame.size.width, datePickerHeight);

//add datePicker and toolBar to containerView
[containerView addSubview: toolBar];
[containerView addSubview: datePicker];

[toolBar release];
[datePicker release];

//add containerView to main view

[self.view addSubview: containerView];
[containerView release];

So when view did load they are will be hidden Y of contener view is outside of the your view frame.

Now you should assign property delegate of UITextFieldDelegate

textfield.delegate = self;

In the method of delegate textFieldDidBeginEditing see UITextFieldDelegate you should fire method that will show your datePicker and toolbar. If you have many textFields to define which is was selected use tag property, which is integer and you can use switch instead of many if conditions.

To show your datePicker and toolbar you should change the Y of containerView frame. Here is how to do that

CGRect containerViewFrame = containerView.frame;
containerViewFrame.y -=containerViewHeight;
containerView.frame = containerViewFrame;

To hide just plus the containerViewHeight variable. You can use UIViewAnimations to show it with some animation. For example UIViewAnimationCurveEaseInOut