ios键盘弹起不遮挡输入框

- (void)viewDidAppear:(BOOL)animated{

    

    [super viewDidAppear:animated];

    

    [[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(keyboardWillShown:)

                                                 name:UIKeyboardWillShowNotification object:nil];

    

    [[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(keyboardWillBeHidden:)

                                                 name:UIKeyboardWillHideNotification object:nil];

}

- (void)keyboardWillShown:(NSNotification *)aNotification {

    

    BOOL isMessageEdit = [_inputTextField isEditing];

    if(isMessageEdit){

            NSDictionary* info = [aNotification userInfo];

            CGSize keyboardSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

           float time = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];

            NSLog(@"keyboardSize.height is %f",keyboardSize.height);

            [UIView animateWithDuration:time animations:^{

                CGRect frame = self.base_baseView.frame;

                frame.origin.y -=  keyboardSize.height;

                self.base_baseView.frame = frame;

            }];

    }

}

- (void)keyboardWillBeHidden:(NSNotification *)aNotification{

    NSDictionary* info = [aNotification userInfo];

    float time = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];

    [UIView animateWithDuration:time animations:^{

        CGRect frame = self.base_baseView.frame;

        frame.origin.y =  64;

        self.base_baseView.frame = frame;

    }];

    

}

其中BOOL isMessageEdit = [_inputTextField isEditing];是用来判断是不是_inputTextField这个textfield在编辑状态，然后利用 NSDictionary* info = [aNotification userInfo];来获取键盘的一些信息，我将这个字典打印出来如下：

{

    UIKeyboardAnimationCurveUserInfoKey = 7;

    UIKeyboardAnimationDurationUserInfoKey = "0.25";

    UIKeyboardBoundsUserInfoKey = "NSRect: {{0, 0}, {768, 318}}";

    UIKeyboardCenterBeginUserInfoKey = "NSPoint: {384, 1183}";

    UIKeyboardCenterEndUserInfoKey = "NSPoint: {384, 865}";

    UIKeyboardFrameBeginUserInfoKey = "NSRect: {{0, 1024}, {768, 318}}";

    UIKeyboardFrameEndUserInfoKey = "NSRect: {{0, 706}, {768, 318}}";

}

可以看到键盘的信息，比较常用的UIKeyboardAnimationDurationUserInfoKey键盘弹起的时间，UIKeyboardFrameBeginUserInfoKey可以获取键盘弹出的高度

我是这样做的，想要避免_inputTextField被遮挡：

1.在进入页面之前注册一个通知，分别是键盘将要弹起和键盘将要收起的通知：

 [[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(keyboardWillShown:)

                                                 name:UIKeyboardWillShowNotification object:nil];

    

    [[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(keyboardWillBeHidden:)

                                                 name:UIKeyboardWillHideNotification object:nil];

2.判断是不是这个文本框在编辑：

BOOL isMessageEdit = [_inputTextField isEditing];

3.获取键盘弹出时间和弹出高度

CGSize keyboardSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

float time = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];

4.将view在获取的时间里弹起键盘的高度：

 [UIView animateWithDuration:time animations:^{

                CGRect frame = self.base_baseView.frame;

                frame.origin.y -=  keyboardSize.height;

                self.base_baseView.frame = frame;

            }];

5.在键盘将要收起的通知里，将页面恢复：

[UIView animateWithDuration:time animations:^{

        CGRect frame = self.base_baseView.frame;

        frame.origin.y =  64;

        self.base_baseView.frame = frame;

    }];

我这个带有导航栏，所以从64开始，你的如果没有可以设置y＝0哦。

搞定！！