The keyboard appears in the hidden (solve the problem that the text box will be overwritten when the keyboard pops up, code implementation), the keyboard text box

The keyboard appears in the hidden (solve the problem that the text box will be overwritten when the keyboard pops up, code implementation), the keyboard text box

Hide the keyboard (solve the problem that the text box will be overwritten when the keyboard pops up, and implement the Code)

 

# Import "ViewController. h"

# Import "UIView + FrameExtension. h" // you can write it by yourself for later convenience.

# Define kDeviceHeight [UIScreen mainScreen]. bounds. size. height

@ Interface ViewController ()

@ End

@ Implementation ViewController

-(Void) viewDidLoad {

[Super viewDidLoad];

// Set the view background color

Self. view. backgroundColor = [UIColor lightGrayColor];

// Add the assumption location of the first text box

UITextField * firstField = [[UITextField alloc] initWithFrame: CGRectMake (50,300,200, 40)];

FirstField. backgroundColor = [UIColor whiteColor];

[Self. view addSubview: firstField];

// Add the first text box

UITextField * secondField = [[UITextField alloc] initWithFrame: CGRectMake (firstField. x, firstField. bottom + 50, firstField. width, firstField. height)];

[Self. view addSubview: secondField];

SecondField. backgroundColor = [UIColor whiteColor];

// Register the notification displayed on the keyboard

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

// Register the hidden notifications on the keyboard

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

}

 

// Execute this method when the keyboard pops up,

-(Void) showKeyboard :( NSNotification *) notification {

// Define a text box pointing to the text box being edited, that is, the text box of the pop-up keyboard

UITextField * txtField;

// This time, all the subViews in the current view are traversed. The subViews array stores all the subViews in the current view.

For (UIView * subView in self. view. subviews ){

// If this sub-view is a text box, the isKindOfClass method can determine whether a variable is of a certain type.

If ([subView isKindOfClass: [UITextField class]) {

// Convert the subview into a text box first

UITextField * tempField = (UITextField *) subView;

// Determine whether the text box is being edited.

If (tempField. isEditing ){

// If the text box is being edited, it is the text box that I am looking.

TxtField = tempField;

Break;

}

}

}

NSLog (@ "% @", notification );

// Get the userInfo attribute of the notification

NSDictionary * userInfoDict = notification. userInfo;

// Obtain the keyboard bounds through the userInfo attribute of the keyboard notification

NSValue * value = [userInfoDict objectForKey: UIKeyboardBoundsUserInfoKey];

// Keyboard size

CGSize keyboardSize = [value CGRectValue]. size;

// Keyboard height

CGFloat keyboardHeight = keyboardSize. height;

CGFloat offset = kDeviceHeight-keyboardHeight-txtField. bottom;

If (offset <0) {// in this case, you need to move up

Offset = offset-10; // Save the height of the move up

[UIView animateWithDuration: 0.5 animations: ^ {

Self. view. transform = CGAffineTransformMakeTranslation (0, offset );

}];

}

}

 

-(Void) hideKeyboard :( NSNotification *) notification {

[UIView animateWithDuration: 2 animations: ^ {

Self. view. transform = CGAffineTransformIdentity;

}];

}

// Hide the keyboard when the screen is blank

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

[Self. view endEditing: YES];

}

@ End

 

The source file can be downloaded here, hope to help you: http://pan.baidu.com/s/1pLms9zP