IOS development (21) about UITextField keyboard occlusion

1 Preface
During App creation, the UITextField Keyboard will block the following content. Because IOS does not have its own mechanism, you need to write your own method to control it, today, we will introduce a simple method to address the problem of keyboard occlusion.

2. code example
ZYViewController. h

 

[Plain]
# Import <UIKit/UIKit. h>
 
@ Interface ZYViewController: UIViewController <UITextFieldDelegate>
 
@ Property (nonatomic, strong) UITextField * myTextField;
 
@ End

# Import <UIKit/UIKit. h>

@ Interface ZYViewController: UIViewController <UITextFieldDelegate>

@ Property (nonatomic, strong) UITextField * myTextField;

@ End
ZYViewController. m

 

[Plain]
@ Synthesize myTextField;
 
-(Void) viewDidLoad
{
[Super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
// Self. view. backgroundColor = [UIColor underPageBackgroundColor];
MyTextField = [[UITextField alloc] init]; // initialize UITextField
MyTextField. frame = CGRectMake (35,230,250, 35 );
MyTextField. delegate = self; // sets the proxy.
MyTextField. borderStyle = UITextBorderStyleRoundedRect;
MyTextField. contentVerticalAlignment = uicontrolcontentverticalignmentcenter; // center vertically
MyTextField. placeholder = @ "Please entry your content! "; // Default text when the content is empty
MyTextField. returnKeyType = UIReturnKeyDone; // set the style of the put back button.
MyTextField. keyboardType = UIKeyboardTypeNumbersAndPunctuation; // you can specify the keyboard style as a number.
[Self. view addSubview: myTextField];


// Register the notification when the keyboard appears or is hidden
[[Nsicationcenter center defacenter center] addObserver: self
Selector: @ selector (keyboadWillShow :)
Name: UIKeyboardWillShowNotification
Object: nil];
[[Nsicationcenter center defacenter center] addObserver: self
Selector: @ selector (keyboardWillHide :)
Name: UIKeyboardWillHideNotification
Object: nil];
// Add a gesture and click to close the keyboard in other areas of the screen
UITapGestureRecognizer * gesture = [[UITapGestureRecognizer alloc] initWithTarget: self action: @ selector (hideKeyboard)];
Gesture. numberOfTapsRequired = 1; // Number of gesture strikes
[Self. view addGestureRecognizer: gesture];
}
 
// Events called when the keyboard appears
-(Void) keyboadWillShow :( NSNotification *) note {
NSDictionary * info = [note userInfo];
CGSize keyboardSize = [[info objectForKey: UIKeyboardFrameEndUserInfoKey] CGRectValue]. size; // frame of the keyboard
CGFloat offY = (460-keyboardSize.height)-myTextField. frame. size. height; // screen height-keyboard height-UITextField height
[UIView beginAnimations: nil context: NULL]; // Add an animation here to make the change smoother.
[UIView setAnimationDuration: 0.3]; // sets the animation time in seconds.
MyTextField. frame = CGRectMake (35, offY, 250, 35); // move the y coordinate of the UITextField to offY
[UIView commitAnimations]; // starts the animation effect.

}
// Events called when the keyboard disappears
-(Void) keyboardWillHide :( NSNotification *) note {
[UIView beginAnimations: nil context: NULL]; // Add an animation here to make the change smoother.
[UIView setAnimationDuration: 0.3];
MyTextField. frame = CGRectMake (35,230,250, 35); // restore the UITextField position
 
[UIView commitAnimations];
}
// Hide the keyboard
-(Void) hideKeyboard {
[MyTextField resignFirstResponder];
}
# Pragma mark-
# Pragma mark UITextFieldDelegate
// Start editing:
-(BOOL) textFieldShouldBeginEditing :( UITextField *) textField
{
Return YES;
}
 
// Click the return button to perform the following actions:
-(BOOL) textFieldShouldReturn :( UITextField *) textField
{
[TextField resignFirstResponder]; // cancel the first response
Return YES;
}
 
// Edited:
-(Void) textFieldDidEndEditing :( UITextField *) textField
{

}
 
-(Void) viewDidDisappear :( BOOL) animated {
[Super viewDidDisappear: animated];
[[Nsicationcenter center defacenter center] removeObserver: self]; // remove the observer
}

@ Synthesize myTextField;

-(Void) viewDidLoad
{
[Super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
// Self. view. backgroundColor = [UIColor underPageBackgroundColor];
MyTextField = [[UITextField alloc] init]; // initialize UITextField
MyTextField. frame = CGRectMake (35,230,250, 35 );
MyTextField. delegate = self; // sets the proxy.
MyTextField. borderStyle = UITextBorderStyleRoundedRect;
MyTextField. contentVerticalAlignment = uicontrolcontentverticalignmentcenter; // center vertically
MyTextField. placeholder = @ "Please entry your content! "; // Default text when the content is empty
MyTextField. returnKeyType = UIReturnKeyDone; // set the style of the put back button.
MyTextField. keyboardType = UIKeyboardTypeNumbersAndPunctuation; // you can specify the keyboard style as a number.
[Self. view addSubview: myTextField];


// Register the notification when the keyboard appears or is hidden
[[Nsicationcenter center defacenter center] addObserver: self
Selector: @ selector (keyboadWillShow :)
Name: UIKeyboardWillShowNotification
Object: nil];
[[Nsicationcenter center defacenter center] addObserver: self
Selector: @ selector (keyboardWillHide :)
Name: UIKeyboardWillHideNotification
Object: nil];
// Add a gesture and click to close the keyboard in other areas of the screen
UITapGestureRecognizer * gesture = [[UITapGestureRecognizer alloc] initWithTarget: self action: @ selector (hideKeyboard)];
Gesture. numberOfTapsRequired = 1; // Number of gesture strikes
[Self. view addGestureRecognizer: gesture];
}

// Events called when the keyboard appears
-(Void) keyboadWillShow :( NSNotification *) note {
NSDictionary * info = [note userInfo];
CGSize keyboardSize = [[info objectForKey: UIKeyboardFrameEndUserInfoKey] CGRectValue]. size; // frame of the keyboard
CGFloat offY = (460-keyboardSize.height)-myTextField. frame. size. height; // screen height-keyboard height-UITextField height
[UIView beginAnimations: nil context: NULL]; // Add an animation here to make the change smoother.
[UIView setAnimationDuration: 0.3]; // sets the animation time in seconds.
MyTextField. frame = CGRectMake (35, offY, 250, 35); // move the y coordinate of the UITextField to offY
[UIView commitAnimations]; // starts the animation effect.

}
// Events called when the keyboard disappears
-(Void) keyboardWillHide :( NSNotification *) note {
[UIView beginAnimations: nil context: NULL]; // Add an animation here to make the change smoother.
[UIView setAnimationDuration: 0.3];
MyTextField. frame = CGRectMake (35,230,250, 35); // restore the UITextField position

[UIView commitAnimations];
}
// Hide the keyboard
-(Void) hideKeyboard {
[MyTextField resignFirstResponder];
}
# Pragma mark-
# Pragma mark UITextFieldDelegate
// Start editing:
-(BOOL) textFieldShouldBeginEditing :( UITextField *) textField
{
Return YES;
}

// Click the return button to perform the following actions:
-(BOOL) textFieldShouldReturn :( UITextField *) textField
{
[TextField resignFirstResponder]; // cancel the first response
Return YES;
}

// Edited:
-(Void) textFieldDidEndEditing :( UITextField *) textField
{

}

-(Void) viewDidDisappear :( BOOL) animated {
[Super viewDidDisappear: animated];
[[Nsicationcenter center defacenter center] removeObserver: self]; // remove the observer
}
Running result:

Initial status

 

Click the input box