xcode 横向自动布局内容大小的 UIScrollview

Question

提问by Jim

I'm trying to show a simple settings screen in my app and I'm using Autolayout. Since my app supports landscape, and the settings controls don't quite fit vertically when the phone is landscape, I added a UIScrollview.

我正在尝试在我的应用程序中显示一个简单的设置屏幕，并且我正在使用自动布局。由于我的应用程序支持横向，并且设置控件在手机横向时不太适合垂直，因此我添加了一个 UIScrollview。

It seems that the combination of UIScrollview and Autolayout is a common question here and elsewhere. I've read a few articles on it, and from what it can tell, it seems that a good way to go for what I'm trying to do is to put my various controls within a view, like a "contentView" with constraints aligned in that view. Then have that contentView be the sole subview of the UIScrollView. I have the contentView with constraints tied to the edges of the UIScrollView.

似乎 UIScrollview 和 Autolayout 的组合是这里和其他地方的常见问题。我已经阅读了一些关于它的文章，从它可以看出，似乎我想要做的事情的一个好方法是将我的各种控件放在一个视图中，例如带有约束的“contentView”在该视图中对齐。然后让 contentView 成为 UIScrollView 的唯一子视图。我将 contentView 的约束绑定到 UIScrollView 的边缘。

UINavigationView -> UIScrollview -> contentView (UIView) -> Control Subviews

xib

It works fine in portrait, even if I add content in my contentView that requires scrolling to see, but when I go to landscape, it doesn't let me scroll down far enough. It's like the content size gets reset to the frame of the visible area (or the frame of the navigation controller superview) when I rotate.

它在纵向模式下运行良好，即使我在 contentView 中添加了需要滚动才能看到的内容，但是当我进入横向模式时，它并不能让我向下滚动得足够远。就像当我旋转时内容大小被重置为可见区域的框架（或导航控制器超级视图的框架）。

simulator

模拟器

I'm wondering if I need to check for rotation and then set the content size again at that time? If so, is there a way to get that size dynamically from the view (contentView)?

我想知道我是否需要检查旋转然后再次设置内容大小？如果是这样，有没有办法从视图（contentView）中动态获取该大小？

Thanks for any help you can offer! Jim

谢谢你的尽心帮助！吉姆

Answer 1

回答by Rob

There are two components to having auto layout properly handle scroll views:

自动布局正确处理滚动视图有两个组成部分：

Constraints for scroll view's subviews: The contentSizeof the scroll view will be dictated by the constraints of the scroll view's subviews. Thus, you need to have a bottom constraint for the last control in the scroll view (i.e. second switch) to its superview (i.e. the scroll view). It looks like you do have this. These constraints for subviews of the scroll view will automatically adjust the scroll view's contentSizeas needed.
By the way, the constantfor this second switch's bottom constraint will generally default to some largish value corresponding to how it was laid out in portrait. You may want to select and edit this bottom constraint for this last control and change it so that it's the "standard" value.

Constraints for the scroll view itself: You need to make sure you have the bottom constraint for the scroll view, itself, to its superview (and make sure you do nothave a height constraint on the scroll view). This will adjust the frameof the scroll view upon screen rotation. I wonder if this might be missing in your project.

You can confirm this by running your app in the debugger, hitting "pause" button:

enter image description here

and then at the (lldb)prompt, type po [[UIWindow keyWindow] recursiveDescription], and you should see something like:

(lldb) po [[UIWindow keyWindow] recursiveDescription]
<UIWindow: 0x8b97ff0; frame = (0 0; 320 480); autoresize = W+H; gestureRecognizers = <NSArray: 0x8b98450>; layer = <UIWindowLayer: 0x8b97af0>>
   | <UIView: 0x8b9a830; frame = (0 0; 320 480); transform = [0, -1, 1, 0, 0, 0]; autoresize = RM+BM; layer = <CALayer: 0x8b9a240>>
   |    | <UIScrollView: 0x8b9aa50; frame = (0 0; 480 320); clipsToBounds = YES; autoresize = RM+TM; gestureRecognizers = <NSArray: 0x8b9a6c0>; layer = <CALayer: 0x8b9a130>; contentOffset: {0, 0}>
   |    |    | <UILabel: 0x8b9ade0; frame = (20 20; 63 21); text = 'Settings'; clipsToBounds = YES; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x8b9aec0>>
   |    |    | <UILabel: 0x8b9d590; frame = (20 49; 51 21); text = 'View 1'; clipsToBounds = YES; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x8b9d6b0>>
   |    |    | <UILabel: 0x8b9db70; frame = (408 49; 51 21); text = 'View 2'; clipsToBounds = YES; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x8b9dc10>>
   |    |    | <UIView: 0x8b9de60; frame = (335 78; 124 53); autoresize = RM+BM; layer = <CALayer: 0x8b9dec0>>
   |    |    | <UIView: 0x8b9e000; frame = (20 78; 284 53); autoresize = RM+BM; layer = <CALayer: 0x8b9e060>>
   |    |    | <UILabel: 0x8b9e250; frame = (20 139; 59 21); text = 'Slider 1'; clipsToBounds = YES; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x8b9e2f0>>
   |    |    | <UISlider: 0x8b9e460; frame = (18 238; 444 34); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x8b9e5c0>; value: 0.500000>
   |    |    |    | <UIView: 0x8ace410; frame = (2 16; 440 2); userInteractionEnabled = NO; layer = <CALayer: 0x8ace470>>
   |    |    |    |    | <UIView: 0x8ace610; frame = (221 0; 219 2); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8ace670>>
   |    |    |    |    |    | <UIView: 0x8ace6e0; frame = (-221 0; 440 2); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8ace740>>
   |    |    |    |    |    |    | <CAGradientLayer: 0x8ace7b0> (layer)
   |    |    |    |    | <UIView: 0x8ace7e0; frame = (0 0; 221 2); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8ace840>>
   |    |    |    | <UIImageView: 0x8ace9d0; frame = (207 1; 31 31); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8acea60>>
   |    |    |    |    | <UIImageView: 0x8ace8b0; frame = (-13 -6.5; 57 43.5); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8ace940>>
   |    |    | <UISlider: 0x8b9e850; frame = (17 168; 444 34); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x8b9e930>; value: 0.500000>
   |    |    |    | <UIView: 0x8ba5430; frame = (2 16; 440 2); userInteractionEnabled = NO; layer = <CALayer: 0x8ba5490>>
   |    |    |    |    | <UIView: 0x8acc190; frame = (221 0; 219 2); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8acae30>>
   |    |    |    |    |    | <UIView: 0x8acc3f0; frame = (-221 0; 440 2); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8ac84d0>>
   |    |    |    |    |    |    | <CAGradientLayer: 0x8accb90> (layer)
   |    |    |    |    | <UIView: 0x8acdf50; frame = (0 0; 221 2); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8acdfb0>>
   |    |    |    | <UIImageView: 0x8ace070; frame = (207 1; 31 31); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8ace100>>
   |    |    |    |    | <UIImageView: 0x8acdfe0; frame = (-13 -6.5; 57 43.5); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8acdc80>>
   |    |    | <UILabel: 0x8b9e9c0; frame = (20 209; 59 21); text = 'Slider 2'; clipsToBounds = YES; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x8b9ea60>>
   |    |    | <UISwitch: 0x8b9ece0; frame = (411 279; 51 31); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x8b9edd0>>
   |    |    |    | <_UISwitchInternalViewNeueStyle1: 0x8b9f0c0; frame = (0 0; 51 31); gestureRecognizers = <NSArray: 0x8b723f0>; layer = <CALayer: 0x8b9f1c0>>
   |    |    |    |    | <UIView: 0x8b9f750; frame = (35.5 0; 15.5 31); clipsToBounds = YES; layer = <CALayer: 0x8b9f7b0>>
   |    |    |    |    |    | <UIView: 0x8b9f3b0; frame = (-35.5 0; 51 31); layer = <CALayer: 0x8b9f410>>
   |    |    |    |    | <UIView: 0x8b9f6c0; frame = (0 0; 35.5 31); clipsToBounds = YES; layer = <CALayer: 0x8b9f720>>
   |    |    |    |    |    | <UIView: 0x8b9f440; frame = (0 0; 51 31); layer = <CALayer: 0x8b9f4a0>>
   |    |    |    |    | <UIView: 0x8ba11e0; frame = (0 0; 51 31); layer = <CALayer: 0x8ba1240>>
   |    |    |    |    |    | <UIImageView: 0x8ba0f10; frame = (39 16; 0 0); alpha = 0; userInteractionEnabled = NO; layer = <CALayer: 0x8ba10f0>>
   |    |    |    |    |    | <UIImageView: 0x8ba1120; frame = (12 16; 0 0); userInteractionEnabled = NO; layer = <CALayer: 0x8ba11b0>>
   |    |    |    |    | <UIImageView: 0x8b9fab0; frame = (7 -6; 57 43.5); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8ba0a40>>
   |    |    | <UISwitch: 0x8b974b0; frame = (411 318; 51 31); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x8b75570>>
   |    |    |    | <_UISwitchInternalViewNeueStyle1: 0x8b7d6a0; frame = (0 0; 51 31); gestureRecognizers = <NSArray: 0x8b845e0>; layer = <CALayer: 0x8b78750>>
   |    |    |    |    | <UIView: 0x8b7df70; frame = (35.5 0; 15.5 31); clipsToBounds = YES; layer = <CALayer: 0x8b7be00>>
   |    |    |    |    |    | <UIView: 0x8b72410; frame = (-35.5 0; 51 31); layer = <CALayer: 0x8b7a660>>
   |    |    |    |    | <UIView: 0x8b7ba80; frame = (0 0; 35.5 31); clipsToBounds = YES; layer = <CALayer: 0x8b7bd00>>
   |    |    |    |    |    | <UIView: 0x8b78dd0; frame = (0 0; 51 31); layer = <CALayer: 0x8b7ba20>>
   |    |    |    |    | <UIView: 0x8b81580; frame = (0 0; 51 31); layer = <CALayer: 0x8b77ee0>>
   |    |    |    |    |    | <UIImageView: 0x8b97880; frame = (39 16; 0 0); alpha = 0; userInteractionEnabled = NO; layer = <CALayer: 0x8b7e1a0>>
   |    |    |    |    |    | <UIImageView: 0x8b77460; frame = (12 16; 0 0); userInteractionEnabled = NO; layer = <CALayer: 0x8b7e350>>
   |    |    |    |    | <UIImageView: 0x8b80670; frame = (7 -6; 57 43.5); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8b80700>>
   |    |    | <UILabel: 0x8b97cf0; frame = (335 284; 67 21); text = 'Switch 1'; clipsToBounds = YES; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x8b808b0>>
   |    |    | <UILabel: 0x8b79d60; frame = (335 323; 67 21); text = 'Switch 2'; clipsToBounds = YES; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x8b77b90>>
   |    |    | <UIImageView: 0x8ac44f0; frame = (476 473; 3 7); alpha = 0; opaque = NO; autoresize = LM; userInteractionEnabled = NO; layer = <CALayer: 0x8a89130>>
   |    |    | <UIImageView: 0x8ac2be0; frame = (313 316; 7 3); alpha = 0; opaque = NO; autoresize = TM; userInteractionEnabled = NO; layer = <CALayer: 0x8ac2c70>>
   |    | <_UILayoutGuide: 0x8b9cb20; frame = (0 0; 0 20); hidden = YES; layer = <CALayer: 0x8b9e5f0>>
   |    | <_UILayoutGuide: 0x8ac4440; frame = (0 320; 0 0); hidden = YES; layer = <CALayer: 0x8a90370>>

Check the frameof the UIScrollView(e.g. the above is for landscape on iPhone), and make sure it corresponds to the size of screen. If you haven't defined the constraints between the scroll view and its superview, this framemay be incorrect.

滚动视图的子视图的约束：contentSize滚动视图的约束将由滚动视图的子视图的约束决定。因此，您需要为滚动视图（即第二个开关）中的最后一个控件设置一个底部约束到其超级视图（即滚动视图）。看起来你确实有这个。这些滚动视图子视图的约束将contentSize根据需要自动调整滚动视图。
顺便说一下，constant第二个开关的底部约束通常会默认为一些较大的值，对应于它的纵向布局方式。您可能希望为最后一个控件选择和编辑此底部约束并对其进行更改，使其成为“标准”值。

滚动视图本身的约束：您需要确保滚动视图本身对其超级视图具有底部约束（并确保滚动视图没有高度约束）。这将frame在屏幕旋转时调整滚动视图的。我想知道这是否可能在您的项目中丢失。

您可以通过在调试器中运行您的应用程序来确认这一点，点击“暂停”按钮：

在此处输入图片说明

然后在(lldb)提示符下，键入po [[UIWindow keyWindow] recursiveDescription]，您应该会看到如下内容：

(lldb) po [[UIWindow keyWindow] recursiveDescription]
<UIWindow: 0x8b97ff0; frame = (0 0; 320 480); autoresize = W+H; gestureRecognizers = <NSArray: 0x8b98450>; layer = <UIWindowLayer: 0x8b97af0>>
   | <UIView: 0x8b9a830; frame = (0 0; 320 480); transform = [0, -1, 1, 0, 0, 0]; autoresize = RM+BM; layer = <CALayer: 0x8b9a240>>
   |    | <UIScrollView: 0x8b9aa50; frame = (0 0; 480 320); clipsToBounds = YES; autoresize = RM+TM; gestureRecognizers = <NSArray: 0x8b9a6c0>; layer = <CALayer: 0x8b9a130>; contentOffset: {0, 0}>
   |    |    | <UILabel: 0x8b9ade0; frame = (20 20; 63 21); text = 'Settings'; clipsToBounds = YES; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x8b9aec0>>
   |    |    | <UILabel: 0x8b9d590; frame = (20 49; 51 21); text = 'View 1'; clipsToBounds = YES; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x8b9d6b0>>
   |    |    | <UILabel: 0x8b9db70; frame = (408 49; 51 21); text = 'View 2'; clipsToBounds = YES; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x8b9dc10>>
   |    |    | <UIView: 0x8b9de60; frame = (335 78; 124 53); autoresize = RM+BM; layer = <CALayer: 0x8b9dec0>>
   |    |    | <UIView: 0x8b9e000; frame = (20 78; 284 53); autoresize = RM+BM; layer = <CALayer: 0x8b9e060>>
   |    |    | <UILabel: 0x8b9e250; frame = (20 139; 59 21); text = 'Slider 1'; clipsToBounds = YES; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x8b9e2f0>>
   |    |    | <UISlider: 0x8b9e460; frame = (18 238; 444 34); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x8b9e5c0>; value: 0.500000>
   |    |    |    | <UIView: 0x8ace410; frame = (2 16; 440 2); userInteractionEnabled = NO; layer = <CALayer: 0x8ace470>>
   |    |    |    |    | <UIView: 0x8ace610; frame = (221 0; 219 2); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8ace670>>
   |    |    |    |    |    | <UIView: 0x8ace6e0; frame = (-221 0; 440 2); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8ace740>>
   |    |    |    |    |    |    | <CAGradientLayer: 0x8ace7b0> (layer)
   |    |    |    |    | <UIView: 0x8ace7e0; frame = (0 0; 221 2); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8ace840>>
   |    |    |    | <UIImageView: 0x8ace9d0; frame = (207 1; 31 31); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8acea60>>
   |    |    |    |    | <UIImageView: 0x8ace8b0; frame = (-13 -6.5; 57 43.5); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8ace940>>
   |    |    | <UISlider: 0x8b9e850; frame = (17 168; 444 34); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x8b9e930>; value: 0.500000>
   |    |    |    | <UIView: 0x8ba5430; frame = (2 16; 440 2); userInteractionEnabled = NO; layer = <CALayer: 0x8ba5490>>
   |    |    |    |    | <UIView: 0x8acc190; frame = (221 0; 219 2); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8acae30>>
   |    |    |    |    |    | <UIView: 0x8acc3f0; frame = (-221 0; 440 2); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8ac84d0>>
   |    |    |    |    |    |    | <CAGradientLayer: 0x8accb90> (layer)
   |    |    |    |    | <UIView: 0x8acdf50; frame = (0 0; 221 2); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8acdfb0>>
   |    |    |    | <UIImageView: 0x8ace070; frame = (207 1; 31 31); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8ace100>>
   |    |    |    |    | <UIImageView: 0x8acdfe0; frame = (-13 -6.5; 57 43.5); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8acdc80>>
   |    |    | <UILabel: 0x8b9e9c0; frame = (20 209; 59 21); text = 'Slider 2'; clipsToBounds = YES; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x8b9ea60>>
   |    |    | <UISwitch: 0x8b9ece0; frame = (411 279; 51 31); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x8b9edd0>>
   |    |    |    | <_UISwitchInternalViewNeueStyle1: 0x8b9f0c0; frame = (0 0; 51 31); gestureRecognizers = <NSArray: 0x8b723f0>; layer = <CALayer: 0x8b9f1c0>>
   |    |    |    |    | <UIView: 0x8b9f750; frame = (35.5 0; 15.5 31); clipsToBounds = YES; layer = <CALayer: 0x8b9f7b0>>
   |    |    |    |    |    | <UIView: 0x8b9f3b0; frame = (-35.5 0; 51 31); layer = <CALayer: 0x8b9f410>>
   |    |    |    |    | <UIView: 0x8b9f6c0; frame = (0 0; 35.5 31); clipsToBounds = YES; layer = <CALayer: 0x8b9f720>>
   |    |    |    |    |    | <UIView: 0x8b9f440; frame = (0 0; 51 31); layer = <CALayer: 0x8b9f4a0>>
   |    |    |    |    | <UIView: 0x8ba11e0; frame = (0 0; 51 31); layer = <CALayer: 0x8ba1240>>
   |    |    |    |    |    | <UIImageView: 0x8ba0f10; frame = (39 16; 0 0); alpha = 0; userInteractionEnabled = NO; layer = <CALayer: 0x8ba10f0>>
   |    |    |    |    |    | <UIImageView: 0x8ba1120; frame = (12 16; 0 0); userInteractionEnabled = NO; layer = <CALayer: 0x8ba11b0>>
   |    |    |    |    | <UIImageView: 0x8b9fab0; frame = (7 -6; 57 43.5); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8ba0a40>>
   |    |    | <UISwitch: 0x8b974b0; frame = (411 318; 51 31); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x8b75570>>
   |    |    |    | <_UISwitchInternalViewNeueStyle1: 0x8b7d6a0; frame = (0 0; 51 31); gestureRecognizers = <NSArray: 0x8b845e0>; layer = <CALayer: 0x8b78750>>
   |    |    |    |    | <UIView: 0x8b7df70; frame = (35.5 0; 15.5 31); clipsToBounds = YES; layer = <CALayer: 0x8b7be00>>
   |    |    |    |    |    | <UIView: 0x8b72410; frame = (-35.5 0; 51 31); layer = <CALayer: 0x8b7a660>>
   |    |    |    |    | <UIView: 0x8b7ba80; frame = (0 0; 35.5 31); clipsToBounds = YES; layer = <CALayer: 0x8b7bd00>>
   |    |    |    |    |    | <UIView: 0x8b78dd0; frame = (0 0; 51 31); layer = <CALayer: 0x8b7ba20>>
   |    |    |    |    | <UIView: 0x8b81580; frame = (0 0; 51 31); layer = <CALayer: 0x8b77ee0>>
   |    |    |    |    |    | <UIImageView: 0x8b97880; frame = (39 16; 0 0); alpha = 0; userInteractionEnabled = NO; layer = <CALayer: 0x8b7e1a0>>
   |    |    |    |    |    | <UIImageView: 0x8b77460; frame = (12 16; 0 0); userInteractionEnabled = NO; layer = <CALayer: 0x8b7e350>>
   |    |    |    |    | <UIImageView: 0x8b80670; frame = (7 -6; 57 43.5); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x8b80700>>
   |    |    | <UILabel: 0x8b97cf0; frame = (335 284; 67 21); text = 'Switch 1'; clipsToBounds = YES; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x8b808b0>>
   |    |    | <UILabel: 0x8b79d60; frame = (335 323; 67 21); text = 'Switch 2'; clipsToBounds = YES; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x8b77b90>>
   |    |    | <UIImageView: 0x8ac44f0; frame = (476 473; 3 7); alpha = 0; opaque = NO; autoresize = LM; userInteractionEnabled = NO; layer = <CALayer: 0x8a89130>>
   |    |    | <UIImageView: 0x8ac2be0; frame = (313 316; 7 3); alpha = 0; opaque = NO; autoresize = TM; userInteractionEnabled = NO; layer = <CALayer: 0x8ac2c70>>
   |    | <_UILayoutGuide: 0x8b9cb20; frame = (0 0; 0 20); hidden = YES; layer = <CALayer: 0x8b9e5f0>>
   |    | <_UILayoutGuide: 0x8ac4440; frame = (0 320; 0 0); hidden = YES; layer = <CALayer: 0x8a90370>>

检查frame的UIScrollView（例如，上面是关于iPhone景观），并确保它对应于屏幕的大小。如果您还没有定义滚动视图与其父视图之间的约束，这frame可能是不正确的。

Answer 2

回答by Gobe

Maybe others will have a better solution for this, but the fastest without changing too much on your current build would be to do exactly what you said: check for rotation and then set the content size again. It would be done like this in your Settings View Controllerimplementation file:

也许其他人会对此有更好的解决方案，但在不改变当前构建的情况下最快的方法是完全按照您说的去做：检查旋转，然后再次设置内容大小。这将在您的设置视图控制器实现文件中完成：

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
    self.scrollView.contentSize = self.contentView.bounds.size;
}

... assuming you have added in that same file outlets to your UIScrollViewand your UIViewnamed scrollViewand contentViewrespectively.

......假设你已经在同一个文件网点添加到您UIScrollView和您的UIView命名scrollView和contentView分别。

xcode 横向自动布局内容大小的 UIScrollview

提问by Jim

回答by Rob

回答by Gobe

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xcode 横向自动布局内容大小的 UIScrollview

提问by Jim

回答by Rob

回答by Gobe

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