UIScrollView 在 iOS7 中不滚动自动布局

问题描述

我有一个 UIScrollView，里面有 6 个文本字段和一个按钮.scrollView 内容不足，无法滚动.

I have a UIScrollView with a 6 textfields in it and a button inside of it. There is not enough content in the scrollView to make it scroll.

但是当键盘显示时，我希望滚动视图滚动，这样用户就不必关闭键盘来选择另一个被键盘隐藏的文本字段.

But when the keyboard shows, I would like the scrollview to scroll so the user doesn't have to dismiss the keyboard in order to select another textfield that is hidden by the keyboard.

我使用的是 iOS7 并启用了自动布局.

I am using iOS7 and have autolayout enabled.

有什么建议吗?

我正在使用故事板，我拥有的唯一代码如下.

I am using storyboards and the only code I have is the following.

reg.h 文件

interface registerViewController : UIViewController <UITextFieldDelegate, UIScrollViewDelegate>

推荐答案

为了让scrollview 可以滚动，内容的大小必须大于scrollview 的frame，这样scrollview 才有东西可以滚动到.使用 setContentSize 调整内容大小:

In order to make a scrollview scrollable, the content size must be larger than the scrollview's frame so the scrollview has something to scroll to. Use setContentSize to adjust the content size:

[scrollview setContentSize:CGSizeMake(width, height)];

在这种情况下，你应该将大小调整为view.frame.width，view.frame.height + keyboard_height，然后在键盘出现后调整内容偏移:

In this case, you should adjust the size to view.frame.width, view.frame.height + keyboard_height, then adjust the content offset once the keyboard appears:

[scrollview setContentOffset:CGPointMake(0, 0 - keyboard_height)];

如果由于某些与自动布局相关的奇怪原因，这仍然无法使视图可滚动，请在 viewDidLayoutSubviews 中实现此 setContentSize 函数以覆盖自动布局:

If for some screwy, autolayout-related reason this still doesn't make the view scrollable, implement this setContentSize function in viewDidLayoutSubviews in order to override the autolayout:

- (void)viewDidLayoutSubviews {
     [scrollview setContentSize:CGSizeMake(width, height)];
}

要在关闭键盘后重置滚动视图，请将滚动视图内容大小重置为滚动视图的框架，并将偏移量重置为零:

To reset the scrollview after dismissing the keyboard, reset the scrollview content size to the scrollview's frame and the offset to zero:

[scrollview setContentSize:CGSizeMake(scrollview.frame.size.width, scrollview.frame.size.height)];
[scrollview setContentOffset:CGPointZero];

附:要为内容偏移设置动画，请使用:

P.S. To animate the content offset, use:

[scrollview setContentOffset:offsetSize animated:YES];

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