IOS -- UITextField masking Solution

Zookeeper

I encountered a conventional problem during ios development. UITextField was masked by the keyboard. I searched some materials on the Internet and found two solutions written by my predecessors. solution 1: workshop? Mod = space & uid = 107838 & do = blog & id = 44715. The second solution is to directly move the entire view to the keyboard width. In some scenarios, it is not very appropriate. I have made some changes based on the two parameters. The specific steps are as follows:

I have defined a basic ViewController-BaseViewController.

The. h file content is as follows:

# Import

@ Interface BaseViewController: UIViewController {

UITextField * _ checkText; // used to identify which UITextField is clicked

@ Property (nonatomic) UITextField * checkText;

-(Void) moveInputBarWithKeyboardHeight :( float) _ CGRectHeightwithDuration :( NSTimeInterval) _ NSTimeInterval;

@ End

The. m file is as follows:

# Import "BaseViewController. h"

@ Implementation BaseViewController

-(Void) viewDidLoad {

[Super viewDidLoad];

// Registration notification

[[Nsicationcenter center defacenter center] addObserver: selfselector: @ selector (keyboardWillShow :) name: UIKeyboardWillShowNotificationobject: nil];

[[Nsicationcenter center defacenter center] addObserver: selfselector: @ selector (keyboardWillHide :) name: UIKeyboardWillHideNotificationobject: nil];

// Keyboard height change notification, added by ios5.0

# Ifdef _ IPHONE_5_0

Float version = [[[UIDevice currentDevice] systemVersion] floatValue];

If (version> = 5.0 ){

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

}

# Endif

}

# Pragma mark began to edit UITextField. I tried this method and was called before keyboardWillShow.

-(Void) textFieldDidBeginEditing :( UITextField *) textField {

_ CheckText = textField; // sets the clicked object.

}

# Pragma mark-method called when the keyboard pops up

# Pragma mark Responding to keyboard events

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

If (nil = _ checkText ){

Return;

}

/*

Reduce the size of the text view so that it's not obscured by thekeyboard.

Animate the resize so that it's in sync with the appearance of thekeyboard.

*/

NSDictionary * userInfo = [notification userInfo];

// Get the origin of the keyboard when it's displayed.

NSValue * aValue = [userInfo objectForKey: UIKeyboardFrameEndUserInfoKey];

// Get the top of the keyboard as the y coordinate of its origin inself's view's coordinate system. the bottom of the text view's frame shouldalign with the top of the keyboard's final position.

CGRect keyboardRect = [aValue CGRectValue];

// Get the duration of the animation.

NSValue * animationDurationValue = [userInfoobjectForKey: UIKeyboardAnimationDurationUserInfoKey];

NSTimeInterval animationDuration;

[AnimationDurationValue getValue: & animationDuration];

CGRect textFrame = _ checkText. frame; // The current location of UITextField

Float textY = textFrame. origin. y + textFrame. size. height; // obtain the height of the Bottom Border of UITextField from the top

Float bottomY = self. view. frame. size. height-textY; // obtain the distance from the bottom border to the bottom.

If (bottomY> = keyboardRect. size. height) {// default keyboard height. if it is greater than this height, the system returns

Return;

}

Float moveY = keyboardRect. size. height-bottomY;

// Animate the resize of the text view's frame in sync with the keyboard 'sappearance.

[Self moveInputBarWithKeyboardHeight: moveYwithDuration: animationDuration];

}

// Method called when the keyboard is hidden

(Void) keyboardWillHide :( NSNotification *) notification {

NSDictionary * userInfo = [notification userInfo];

/*

Restore the size of the text view (fill self's view ).

Animate the resize so that it's in sync with the disappearance of thekeyboard.

*/

NSValue * animationDurationValue = [userInfoobjectForKey: UIKeyboardAnimationDurationUserInfoKey];

NSTimeInterval animationDuration;

[AnimationDurationValue getValue: & animationDuration];

[Self moveInputBarWithKeyboardHeight: 0.0 withDuration: animationDuration];

}

# Pragma mark mobile view

-(Void) moveInputBarWithKeyboardHeight :( float) _ CGRectHeightwithDuration :( NSTimeInterval) _ NSTimeInterval {

CGRect rect = self. view. frame;

[UIView beginAnimations: nil context: NULL];

[UIView setAnimationDuration: _ NSTimeInterval];

Rect. origin. y =-_ CGRectHeight; // move the view up

Self. view. frame = rect;

[UIView commitAnimations];

}

-(Void) dealloc {

[[Nsicationicationcenter defacenter center] removeObserver: self]; // notification of removing Keyboard Events when the View Controller is eliminated

}

Hope to help you!

Zookeeper