IOS Development --- keyboard overlay control textfield

During the development process, we often encounter a problem: when we select the input box, the keyboard jumps out and overwrites our input box. The problem we need to solve is: move the input box up so that it is above the keyboard:

Prerequisites:

Declare a textfield in your h file

@property (retain, nonatomic) IBOutlet UITextField *textView;

First, the viewdidload method is as follows:

- (void)viewDidLoad{    [super viewDidLoad];// Do any additional setup after loading the view, typically from a nib.    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardwasShown:) name:UIKeyboardDidShowNotification object:nil];    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardwasHidden:) name:UIKeyboardDidHideNotification object:nil];}

In this method, we call two methods: processing the listening event when the keyboard is displayed, and processing the listening event when the keyboard disappears.

(1) Handling of listening events during keyboard display

-(void)keyboardwasShown:(NSNotification *) notify{    CGRect frame = [self.view frame];    if ([[notify name]isEqualToString:UIKeyboardDidShowNotification]) {        [UIView animateWithDuration:0.3 animations:^{            self.view.frame = frame;        }completion:^(BOOL finished) {            //        }];    }        NSDictionary *info = [notify userInfo];    NSValue *aValue = [info objectForKey:UIKeyboardFrameBeginUserInfoKey];        CGSize keyBoardSize = [aValue CGRectValue].size;    CGRect rect = self.textView.frame;    rect.origin.y = self.view.frame.size.height - keyBoardSize.height - rect.size.height;    self.textView.frame = rect;    }

(2) handling of listening events when the keyboard disappears

-(void) keyboardwasHidden:(NSNotification *) notify{    NSDictionary *info = [notify userInfo];    NSValue *aValue = [info objectForKey:UIKeyboardFrameEndUserInfoKey];        CGSize keyBoardSize = [aValue CGRectValue].size;            CGRect rect = self.textView.frame;    rect.origin.y = self.view.frame.size.height - rect.size.height;    self.textView.frame = rect;}