UI keyboard notification and ui keyboard

UI keyboard notification and ui keyboard

 

 

# Import "ViewController. h"

 

@ Interface ViewController ()

@ Property (nonatomic, strong) UITextField * tf;

@ End

 

@ Implementation ViewController

 

-(Void) viewDidLoad {

[Super viewDidLoad];

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

_ Tf = [[UITextField alloc] initWithFrame: CGRectMake (10, self. view. bounds. size. height-40,300, 30)];

_ Tf. borderStyle = UITextBorderStyleRoundedRect;

[Self. view addSubview: _ tf];

/*

Notification center (Singleton)

The notification center is one-to-multiple, that is, the same broadcast can be received by multiple radios.

Proxy is one-to-one

Purpose: 1. It is used to receive and initiate broadcasts.

2. Use the notification name as the channel

*/

/*

Parameter 1: Response class

Parameter 2: response methods in the class

Parameter 3: Notification name (Channel)

Parameter 4: receiving type [note] nil represents any type

*/

//: UIKeyboardWillShowNotification receives the notification to be displayed on the keyboard

[[Nsicationcenter center defacenter center] addObserver: self selector: @ selector (keyBoardWillShow :) name: UIKeyboardWillShowNotification object: nil];

// UIKeyboardWillHideNotification receives notifications to be hidden on the keyboard

[[Nsicationcenter center defacenter center] addObserver: self selector: @ selector (keyBoardWillHide :) name: UIKeyboardWillHideNotification object: nil];

}

# Pragma mark-UIKeyboardWillHideNotification

// Hide the keyboard

-(Void) keyBoardWillHide :( NSNotification *) noti

{

// Noti. userInfo is a dictionary. You can output it to see what the dictionary contains.

// NSLog (@ "% @", noti. userInfo );

　

// Obtain the coordinates after the bullet. [Note that the coordinates are after the bullet.]

CGRect keyBoardEndFrame = [[noti. userInfo objectForKey: UIKeyboardFrameEndUserInfoKey] CGRectValue];

// NSLog (@ "-- % @", NSStringFromCGRect (keyBoardEndFrame ));

[UIView animateWithDuration: 2 animations: ^ {

// Change the position of the text box and let it pop up with the keyboard

CGRect tfRext = _ tf. frame;

TfRext. origin. y = keyBoardEndFrame. origin. y-_ tf. bounds. size. height-10;

_ Tf. frame = tfRext;

}];

}

 

# Pragma mark-UIKeyBoard notification

// The notification is received, so NSNotification is used for the parameter.

// The keyboard will be displayed

-(Void) keyBoardWillShow :( NSNotification *) noti

{

CGRect keyBoardFrame = [[noti. userInfo objectForKey: UIKeyboardFrameEndUserInfoKey] CGRectValue];

// You can output CGRect using the following methods:

// NSStringFromCGRect convert CGRect into a string to obtain the Frame

// NSLog (@ "% @", NSStringFromCGRect (keyBoardFrame ));

// Obtain the animation duration of the keyboard

// CGFloat keyBoardDuration = [noti. userInfo [UIKeyboardAnimationDurationUserInfoKey] floatValue];

[UIView animateWithDuration: 2 animations: ^ {

CGRect tfRect = _ tf. frame;

TfRect. origin. y = keyBoardFrame. origin. y-_ tf. bounds. size. height-10;

_ Tf. frame = tfRect;

}];

}

# Pragma mark-called when your fingers touch any part of the screen

-(Void) touchesBegan :( NSSet <UITouch *> *) touches withEvent :( UIEvent *) event

{

// Hide the keyboard with end editing

[Self. view endEditing: YES];

}

 

 

@ End