ios 以编程方式自动调整蒙版大小 vs Interface Builder / xib / nib

Autoresizing masks programmatically vs Interface Builder / xib / nib

提问by Raj Pawan Gumdal

I was in an (probably false) assumption that enabling the right margin indicator in xib is equivalent to using UIViewAutoresizingFlexibleLeftMargininside code and so on.

我有一个（可能是错误的）假设，即在 xib 中启用右边距指示器等效于使用UIViewAutoresizingFlexibleLeftMargin内部代码等。

So, I used to think according to this snapshot:

所以，我曾经根据这个快照思考：

Later today I had to cross check, and stumbled upon this thread.

今天晚些时候我不得不交叉检查，并偶然发现了这个线程。

And also the apple documentation, entitled with the section with title - "Handling Layout Changes Automatically Using Autoresizing Rules" in this link: https://developer.apple.com/library/content/documentation/WindowsViews/Conceptual/ViewPG_iPhoneOS/CreatingViews/CreatingViews.html

还有苹果文档，标题为“使用自动调整大小规则自动处理布局更改”部分的标题：https: //developer.apple.com/library/content/documentation/WindowsViews/Conceptual/ViewPG_iPhoneOS/CreatingViews/创建视图.html

So I now have a renewed concept in my mind as to how setting autoresizing masks programmatically would be equivalent to xib settings:

所以我现在对如何以编程方式设置自动调整大小掩码等效于 xib 设置有了一个新的概念：

Scenario 1: Setting only (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight)is equivalent to:

场景一：只设置(UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight)相当于：

In XIB?

在XIB？

Scenario 2: Setting (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin)in code is equivalent to:

场景二：(UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin)在代码中设置等价于：

In XIB?

在XIB？

Are my 2 renewed scenarios correct? Am I right now in my understanding?

我的 2 个更新场景是否正确？我现在理解了吗？

采纳答案by DarkDust

Yes, Interface Builder has it "reversed" in a sense (or UIView, depending on how you look at it). Your cited "scenarios" are correct.

是的，Interface Builder 在某种意义上将它“颠倒”了（或 UIView，取决于你如何看待它）。您引用的“场景”是正确的。

回答by Sam

Yes, you have cited things correctly. Also, I agree that it feels a bit backwards, so for that reason I appreciate your post.

是的，你引用的东西是正确的。另外，我同意感觉有点倒退，因此我很欣赏你的帖子。

You might like using a preprocessor Macro UIViewAutoresizingFlexibleMarginswhen making a UIView's margin flexible in every direction. I put this in the precompiled header file so it gets included everywhere.

UIViewAutoresizingFlexibleMargins在使 UIView 的边距在各个方向上都灵活时，您可能喜欢使用预处理器宏。我把它放在预编译的头文件中，所以它被包含在任何地方。

#define UIViewAutoresizingFlexibleMargins                 \
              UIViewAutoresizingFlexibleBottomMargin    | \
              UIViewAutoresizingFlexibleLeftMargin      | \
              UIViewAutoresizingFlexibleRightMargin     | \
              UIViewAutoresizingFlexibleTopMargin

Using UIViewAutoresizingFlexibleMarginswill make a UI Element stay centered since it will NOT be hugging any one side. To make the element grow / shrink with its parent, set the UIViewAutoresizingFlexibleWidthand UIViewAutoresizingFlexibleHeightrespectively.

使用UIViewAutoresizingFlexibleMargins将使 UI 元素保持居中，因为它不会拥抱任何一侧。要使元素与其父元素一起增长/缩小UIViewAutoresizingFlexibleWidth，请UIViewAutoresizingFlexibleHeight分别设置和。

I like using UIViewAutoresizingFlexibleMarginsbecause I can later reference it like:

我喜欢使用，UIViewAutoresizingFlexibleMargins因为我以后可以像这样引用它：

myView.autoresizingMask = UIViewAutoresizingFlexibleMargins;

instead of

代替

myView.autoresizingMask = UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin;

All to often I see these margins OR'ed together on one line like the example above. Just hard to read.

我经常看到这些边距或像上面的例子一样在一行上。只是难读。

回答by Abdurrahman Mubeen Ali

Enabling the vertical/horizontal arrow (called spring)inside the box will make the height/width flexible. But enabling an outside line (called strut)will make that side inflexible/ non-flexible.

启用框内的垂直/水平箭头（称为弹簧）将使高度/宽度灵活。但是启用外线（称为支柱）会使那一侧变得不灵活/不灵活。

Enabling the outer left line (left strut)is not equivalent to enabling UIViewAutoresizingFlexibleRightMargin. Instead, UIViewAutoresizingFlexibleRightMargin= onif right strut disabled, offif right strut enabled.

启用外部左线（左支柱）不等同于启用UIViewAutoresizingFlexibleRightMargin. 相反，如果右支柱禁用，则UIViewAutoresizingFlexibleRightMargin= on，如果右支柱启用，则关闭。

It is quite confusing at first, but if you see closely, there is a difference in the springs and struts. I don't know why Apple did this, but for me, there were some cases where it was easier to use. And using opposite properties in code is even more confusing.

一开始很混乱，但如果你仔细观察，弹簧和支柱是有区别的。我不知道苹果为什么这样做，但对我来说，在某些情况下它更容易使用。在代码中使用相反的属性更令人困惑。

回答by Muhammad Nayab

Swift 4use this

Swift 4使用这个

gadBannerView?.autoresizingMask = [.flexibleRightMargin  , .flexibleLeftMargin , .flexibleTopMargin , .flexibleBottomMargin]

Objective-C

目标-C

myView.autoresizingMask = UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin;