Question

我有一个包含多个文本字段和文本视图的表单。显示keyboad时，我更新了scrollview框架以防止文本字段隐藏在键盘下。我确实关注this question并实施了类似的解决方案。

它实际上适用于uitextfields，但不适用于uitextviews。

当键盘显示时，scrollview高度会降低键盘高度，然后滚动到聚焦的uitextfield。但是如果关注的项目是uitextview，它就不会滚动，而uiscrollview的高度会降低。

我的scrollview的IB截图;

https://www.dropbox.com/s/a1iblh6nsdqy34t/Screenshot%202014-05-30%2021.44.32.png https://www.dropbox.com/s/o2h8avt5w82r5eo/Screenshot%202014-05-30%2021.45.19.png

这是代码;

// register for keyboard notifications
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardWillShow:)
                                             name:UIKeyboardWillShowNotification
                                           object:nil];

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

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

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

通知处理程序;

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

    if(keyboardUp)
        return;

    NSDictionary* userInfo = [n userInfo];

    // get the size of the keyboard
    CGSize keyboardSize = [[userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;


    const int movementDistance = -keyboardSize.height - keyboardPaddingToScrollView;
    const float movementDuration = 0.30f;

    int movement = movementDistance;

    [UIView beginAnimations: @"anim" context: nil];
    [UIView setAnimationBeginsFromCurrentState: YES];
    [UIView setAnimationDuration: movementDuration];

    CGRect contentSize = self.view.frame;
    contentSize.size.height += movementDistance;
    [self.view setFrame:contentSize];

    [UIView commitAnimations];

}

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

    keyboardUp = true;

    NSLog(NSStringFromCGRect(self.view.frame));
}

-(void)keyboardWillHide:(NSNotification *)n {

    if(!keyboardUp)
        return;

    NSDictionary* userInfo = [n userInfo];

    // get the size of the keyboard
    CGSize keyboardSize = [[userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;


    const int movementDistance = keyboardSize.height + keyboardPaddingToScrollView;
    const float movementDuration = 0.30f;

    int movement = movementDistance;

    [UIView beginAnimations: @"anim" context: nil];
    [UIView setAnimationBeginsFromCurrentState: YES];
    [UIView setAnimationDuration: movementDuration];

    CGRect contentSize = self.view.frame;
    contentSize.size.height += movementDistance;
    self.view.frame = contentSize;

    [UIView commitAnimations];


}

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

    keyboardUp = false;
}

UITerollViews的UIScrollView滚动问题

0 个答案: