设置UIScrollView的contentInset不起作用

Question

我正在使用Apple提出的揭示UITextfield的方法，该方法在被选中后会被键盘隐藏（见清单5-1）：https://developer.apple.com/library/ios/documentation/StringsTextFonts/Conceptual/TextAndWebiPhoneOS/KeyboardManagement/KeyboardManagement.html#//apple_ref/doc/uid/TP40009542-CH5-SW1

这对我不起作用，因为每次我设置conentInset时，我的scrollView会自动向上滚动几个像素就可以了。即使我删除了scrollRectToVisible调用，我的scrollView仍会向上移动。如果我在viewDidLoad中设置contentInset，那么一切都可以作为例外。

注意：我目前没有使用autolayout。如果我在任何事情都没有发生自动布局。

有什么建议吗？

Answer 1

设置contentInset，setContentOffset和scrollIndicatorInsets

示例：

/*!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 Method is used to handle the keyboard visibility.

 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*/
- (void)keyboardWasShown:(NSNotification *)notification
{
    @try
    {
        // Step 1: Get the size of the keyboard.
        CGSize keyboardSizePotriat = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
        CGSize keyboardSize = {keyboardSizePotriat.height,keyboardSizePotriat.width};

        // Step 2: Adjust the bottom content inset of your scroll view by the keyboard height.
        UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize.height, 0.0);
        self.theScrollView.contentInset = contentInsets;
        self.theScrollView.scrollIndicatorInsets = contentInsets;

        // Modify the scrollPoint as per your screen.
        CGPoint scrollPoint = CGPointMake(0.0, self.activeTextField.frame.origin.y - (keyboardSize.height - 45));
        [self.theScrollView setContentOffset:scrollPoint animated:YES];
    }
    @catch (NSException *exception)
    {
        NSLog(@"%s\n exception: Name- %@ Reason->%@", __PRETTY_FUNCTION__,[exception name],[exception reason]);
    }
}

查看以下链接了解更多详情

iOS SDK: Keeping Content From Underneath the Keyboard