ios 中键盘被遮挡解决方案

1.当view是非可以滚动的view时，

// 添加对键盘的通知

- -(void)viewDidLoad{

        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];

        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];

}

- -(void)keyboardWillShow:(NSNotification *)sender{

{

    // 得到键盘的高度

    NSDictionary *dict = [sender userInfo];

    CGSize keyboardSize = [dict[@"UIKeyboardFrameEndUserInfoKey"] CGRectValue].size;

    // 得到输入框CGRectGetMaxY(<#CGRect rect#>)+40到底部的高度

    CGFloat height = (SCREEN_H - (_IPText.frame.origin.y + _IPText.frame.size.height + 40));

    CGFloat newY = -keyboardSize.height + height;

    // 如果键盘的高度大于上面的高度

    if (keyboardSize.height > height) {

        [UIView beginAnimations:nil context:NULL];

        [UIView setAnimationDuration:0.2];

        self.view.frame = CGRectMake(0, newY, SCREEN_W, SCREEN_H);

        [UIView commitAnimations];

    }
}

- (void)keyboardWillHide:(NSNotification *)sender

{

    [UIView beginAnimations:nil context:NULL];

    // 动画时间3s

    [UIView setAnimationDuration:0.2];

    self.view.frame = CGRectMake(0, 0, SCREEN_W, SCREEN_H);

    [UIView commitAnimations];

}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event

{

    [_IPText resignFirstResponder];

}

2.类似于聊天框被遮挡。

- (void)viewDidLoad

{

    // 监听键盘的弹出与隐藏

    // 利用消息中心，首先监听UIKeyboardWillChangeFrameNotification 键盘frame改变的消息

        [[NSNotificationCenter defaultCenter] addObserver:self         selector:@selector(keyboardChangeFrame:)     name:UIKeyboardWillChangeFrameNotification object:nil];

}

//监听键盘弹出与退出的方法

-(void)keyboardChangeFrame:(NSNotification *)sender

{

    /*

     UIKeyboardAnimationCurveUserInfoKey = 7;

     UIKeyboardAnimationDurationUserInfoKey = "0.25";

     UIKeyboardBoundsUserInfoKey = "NSRect: {{0, 0}, {375, 216}}";

     UIKeyboardCenterBeginUserInfoKey = "NSPoint: {187.5, 775}";

     UIKeyboardCenterEndUserInfoKey = "NSPoint: {187.5, 559}";

     //弹出键盘

     UIKeyboardFrameBeginUserInfoKey = "NSRect: {{0, 667}, {375, 216}}";

     UIKeyboardFrameEndUserInfoKey = "NSRect: {{0, 451}, {375, 216}}";

     //隐藏键盘

     UIKeyboardFrameBeginUserInfoKey = "NSRect: {{0, 451}, {375, 216}}";

     UIKeyboardFrameEndUserInfoKey = "NSRect: {{0, 667}, {375, 216}}";

     */

    //transform是相对位移

    // 设置窗口的颜色

    self.view.window.backgroundColor = self.tableView.backgroundColor;

    // 0.取出键盘动画的时间

    CGFloat duration = [sender.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    // 1.取得键盘最后的frame

    CGRect keyboardFrame = [sender.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];

    // 2.计算控制器的view需要平移的距离

    CGFloat transformY = keyboardFrame.origin.y - self.view.frame.size.height;

    // 3.让UITableView的最后一个cell滚到键盘最上面

    // self.view.transform = CGAffineTransformMakeTranslation(0, transformY);

    NSIndexPath *lastIndex = [NSIndexPath indexPathForRow:self.messagesFrame.count - 1 inSection:0];

    [self.tableView scrollToRowAtIndexPath:lastIndex atScrollPosition:UITableViewScrollPositionBottom animated:YES];

    // 4.执行动画（self.view.transform是tableView加上textFiled一起向上移动，也就是整个view）

    [UIView animateWithDuration:duration animations:^{

        self.view.transform = CGAffineTransformMakeTranslation(0, transformY);

    }];

    //    self.view.transform = CGAffineTransformMakeTranslation(0, -216);

}