iOS开发笔记之解决键盘遮挡UITextField问题

    // 键盘出现的通知
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    // 键盘消失的通知
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];

- (void)keyboardWillShow:(NSNotification *)notification {
    // 获取键盘高度
    CGFloat kbHeight = [[notification.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size.height;
    
    // 计算出键盘顶端到输入框底端的距离
    CGRect tFActualFrame = [self.currentTF convertRect:self.currentTF.frame toView:self.view];  // textField在self.view中的实际frame

    CGFloat offset;
    
    offset = tFActualFrame.origin.y + tFActualFrame.size.height - (Screen_Height - kbHeight - Keyboard_Interval);  // Keyboard_Interval为自定义的textField与键盘保持的距离

    // 键盘动画时间
    double duration = [[notification.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    // 将视图上移计算好的偏移
    if (offset > 0) {
        [UIView animateWithDuration:duration animations:^{
            self.view.frame = CGRectMake(0, -offset, self.view.frame.size.width, self.view.frame.size.height);
        }];
    }
}

// 键盘消失事件
- (void)keyboardWillHide:(NSNotification *)notification {
    // 键盘动画时间
    double duration = [[notification.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    // 视图恢复原位置
    [UIView animateWithDuration:duration animations:^{
        self.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
    }];
}