显示UIWebView的键盘时向上移动UIView

Question

I am trying to move an UIView when user touch a textfield in a webview , because keyboard will cover the webview and users will not able to enter text , my codes works very fine ! on iOS 7 !!! but iOS 8 the view moves up but when user select another textfield (in webview) the UIView moves down to the initial position !!! . here is my code :

/* _contactForm = UIWebView
    _contactView = UIView */



- (void)viewDidLoad
{
    [super viewDidLoad];

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

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

}


- (void)keyboardDidShow: (NSNotification *) notif {


      [[[_contactForm subviews] lastObject] setScrollEnabled:YES];

    if ([[UIDevice currentDevice]userInterfaceIdiom]==UIUserInterfaceIdiomPad) {


    [UIView animateWithDuration:.20
                          delay:0
                        options:UIViewAnimationOptionCurveLinear animations:^
                        {

                         [_contentView setFrame:CGRectMake(0, 37 , _contentView.frame.size.width, _contentView.frame.size.height)];


                        } completion:nil];

    }

}




- (void)keyboardDidHide: (NSNotification *) notif{

    [[[_contactForm subviews] lastObject] setScrollEnabled:NO];

    [UIView animateWithDuration:.20
                          delay:0
                        options:UIViewAnimationOptionCurveLinear animations:^
     {

         [_contentView setFrame:CGRectMake(0, 176 , _contentView.frame.size.width, _contentView.frame.size.height)];

     }completion:nil];


    }

}

I also tried UIKeyboardDidHideNotification and UIKeyboardDidShowNotification , but no success !

WebView loads an HTML file from bundle , this is textfield's codes :

<form action="http://someurl.net/mail/mail.cshtml" method="post"  onsubmit="return validate();">

    <input class="textInput" type="text" name="name" placeholder="NAME"/>

    <div class="clearfix"></div>
    <input class="textInput" type="email" name="email" placeholder="EMAIL"/>

    <div class="clearfix"></div>
    <input class="textInput" type="text" name="phone" placeholder="PHONE"/>

    <div class="clearfix"></div>
    <textarea name="msg" cols="19" rows="3" placeholder="MESSAGE"></textarea>
    <div class="clearfix"></div>
    <input type="submit" class="submit" value="SEND"/>

</form>

Answer 1

In iOS 8 its better to use keyboardFrameDidChange rather than UIKeyboardWillShowNotification

Add a listener :

[[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardFrameDidChange:)
                                                 name:UIKeyboardDidChangeFrameNotification object:nil];

Implement the selector :

-(void)keyboardFrameDidChange:(NSNotification*)notification{

NSDictionary* info = [notification userInfo];

CGRect kKeyBoardFrame = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];

[UIView animateWithDuration:0.25f delay:0 options:[[[notification userInfo] objectForKey:UIKeyboardAnimationCurveUserInfoKey] integerValue] animations:^{

   // Do your animation
} completion:^(BOOL finished) {

    [yourView layoutIfNeeded];
}];
}

Answer 2

It's hard to debug the specific issue with your views since I don't know how your constraints are set up. You really shouldn't be issuing a setFrame call, especially with fixed numbers for the height and other values!

It's already been pointed out by Sreejith that you can get the keyboard size this way:

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

If you don't want to change the constraints directly (don't forget you can IBOutlet them and set the constant) you can try altering the edge insets with something like this:

self.scrollView.contentInset = UIEdgeInsetsMake(self.topLayoutGuide.length, 0, self.view.height - keyboardSize.origin.y, 0);

The animation time should also be driven off they keyboard info:

NSTimeInterval animationDuration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];

Linking to a demo project would help a lot in debugging if these suggestions do not work.

Answer 3

我通过设置webView的autoresizingMask解决了相同的问题

_webView.autoresizingMask = UIViewAutoresizingFlexibleHeight;