处理输入框被键盘遮盖的问题

来源：互联网发布：大数据hive 编辑：程序博客网时间：2024/06/07 21:50

我们使用输入框类的控件，有时候在屏幕底部会出现键盘遮盖的问题。

有两种方式处理：1.利用代理方法；2.利用监听键盘事件；

利用代理

意思就是在代理方法里面进行对父视图的Y抽偏移量的计算，上代码缺点是位移不够精确。

#pragma mark - UITextFieldDelegate- (void)textFieldDidBeginEditing:(UITextField *)textField {    NSLog(@"textFieldDidBeginEditing");    CGRect frame = textField.frame;        CGFloat heights = self.view.frame.size.height;        // 当前点击textfield的坐标的Y值 + 当前点击textFiled的高度 - （屏幕高度- 键盘高度 - 键盘上tabbar高度）        // 在这一部 就是了一个 当前textfile的的最大Y值 和 键盘的最全高度的差值，用来计算整个view的偏移量        int offset = frame.origin.y + 42- ( heights - 216.0-35.0);//键盘高度216        NSTimeInterval animationDuration = 0.30f;        [UIView beginAnimations:@"ResizeForKeyBoard" context:nil];        [UIView setAnimationDuration:animationDuration];        float width = self.view.frame.size.width;        float height = self.view.frame.size.height;        if(offset > 0) {        CGRect rect = CGRectMake(0.0f, -offset,width,height);                self.view.frame = rect;    }        [UIView commitAnimations];}- (void)textFieldDidEndEditing:(UITextField *)textField {    NSLog(@"textFieldDidEndEditing");    NSTimeInterval animationDuration = 0.30f;        [UIView beginAnimations:@"ResizeForKeyboard" context:nil];        [UIView setAnimationDuration:animationDuration];        CGRect rect = CGRectMake(0.0f, 0.0f, self.view.frame.size.width, self.view.frame.size.height);        self.view.frame = rect;        [UIView commitAnimations];}

利用监听键盘事件

推荐大家利用这种方式：

- (void)addNotification {        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textFieldBeginEditing:) name:UITextFieldTextDidBeginEditingNotification object:nil];}#pragma mark - Notification- (void)keyboardWillShow:(NSNotification *)notification {        NSDictionary *userInfo = [notification userInfo];    NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];    CGRect keyboardRect = [aValue CGRectValue];        //父view的偏移量 = 选中textfield的Y + 选中textfield的Height - （父view的height - keyboar的height - keyboard的tabbar的height）        CGFloat offset = (CGRectGetMaxY(self.editTextField.frame)+CGRectGetHeight(self.editTextField.frame))-(CGRectGetHeight(self.view.frame)-CGRectGetHeight(keyboardRect));        double duration = [[notification.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];        if (offset > 0) {                [UIView animateWithDuration:duration animations:^{            self.view.frame = CGRectMake(0.0f, -offset, CGRectGetWidth(self.view.frame), CGRectGetHeight(self.view.frame));        }];            }}- (void)keyboardWillHide:(NSNotification *)notification {        double duration = [[notification.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];    [UIView animateWithDuration:duration animations:^{        self.view.frame = CGRectMake(0, 0, CGRectGetWidth(self.view.frame), CGRectGetHeight(self.view.frame));    }];}//获取当前正在编辑的textfield- (void)textFieldBeginEditing:(NSNotification *)notification{    self.editTextField = [notification object];}

总结

其实方法都是一样，最重要的是大家要理解重点，

父view的Y抽偏移量 =选中textfield的Y +选中textfield的Height -（父view的height - keyboar的height - keyboard的tabbar的height）

0 0