如何在软件键盘向上推动时更改UIScrollView内容的高度

问题描述：

我有一个带有textview和按钮的视图，就像在任何典型的消息应用程序中一样。当键盘出现时，文本视图和按钮也被向上推，但是内容被向上推离屏幕，在那里我没有看到它的顶端，但当我强制向下滚动时，我看到它爬下来，它向上弹当我放手的时候。我已经用快速草图说明了我遇到的问题，第三个屏幕是所需的行为。如何在软件键盘向上推动时更改UIScrollView内容的高度

我在.xib文件中有这个视图。我有一个观点 - >滚动型 - >内容查看（其中有一个表，并TextView的和按钮）

我注册键盘的通知，这里是为显示/隐藏方法的代码

- (void)registerForKeyboardNotifications { 
    [[NSNotificationCenter defaultCenter] addObserver:self 
             selector:@selector(keyboardWasShown:) 
              name:UIKeyboardWillShowNotification 
              object:nil]; 

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

} 

- (void)keyboardWasShown:(NSNotification *) aNotification { 
    NSDictionary *info = [aNotification userInfo]; 

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

    // the hardcoded 49 is the height of the uitabbar 
    UIEdgeInsets contentInsets = UIEdgeInsetsMake(-keyboardSize.height+49, 0.0, keyboardSize.height-49, 0.0); 
    self.scrollView.contentInset = contentInsets; 
    self.scrollView.scrollIndicatorInsets = contentInsets; 

    [self.view addGestureRecognizer:self.tapRecognizer]; 

} 


- (void)keyboardWillBeHidden:(NSNotification *) aNotification { 
    UIEdgeInsets contentInsets = UIEdgeInsetsZero; 
    self.scrollView.contentInset = contentInsets; 
    self.scrollView.scrollIndicatorInsets = contentInsets; 

    [self.view removeGestureRecognizer:self.tapRecognizer]; 
}

答

试试这个。

// Called when the UIKeyboardWillShowNotification is sent. 
- (void)keyboardWasShown:(NSNotification*)aNotification{ 

    NSDictionary* info = [aNotification userInfo]; 
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size; 

    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0, 0.0, kbSize.height, 0.0); 
    scrollView.contentInset = contentInsets; 
    scrollView.scrollIndicatorInsets = contentInsets; 

    CGPoint scrollPoint = CGPointMake(0, scrollView.contentSize.height - scrollView.bounds.size.height + scrollView.contentInset.bottom); 
    [scrollView setContentOffset:scrollPoint animated:true]; 

} 

// Called when the UIKeyboardWillHideNotification is sent 
- (void)keyboardWillBeHidden:(NSNotification*)aNotification{ 
    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, 0.0, 0.0); 
    scrollView.contentInset = contentInsets; 
    scrollView.scrollIndicatorInsets = contentInsets; 
}

不幸的是没有为我工作。文本视图和按钮随滚动视图一起移动。 – ioskaveen

请尝试编辑答案 –

这也行不通。我想要做的是适合软件键盘之间的导航栏下的视图顶部的滚动视图 – ioskaveen

答

我已经看到了keyboardWasShown方法这一行

UIEdgeInsets contentInsets = UIEdgeInsetsMake(-keyboardSize.height+49, 0.0, keyboardSize.height-49, 0.0);

你在哪里顶边插图是-ve，becouse 49 - keyboardSize（这是APPX 256）。用此替代它：

UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, (keyboardSize.height-49), 0.0);

玩计算最佳套件给你。希望这项工作:)

如何在软件键盘向上推动时更改UIScrollView内容的高度

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