问题描述

当我将子视图添加到根 ViewController 的视图中，并且自动布局设置leadingSpace、trailingSpace、topSpace 和 bottomSpace 为零时，左右两侧会出现一些额外的空间(所以如果我打印 subview 的框架，它的原点将为 16并且 32 的尺寸小于应有的尺寸).所以实际上我们得到前导和尾随空格不是零......

When I add subview to root ViewController's view, and with auto layout setup leadingSpace,trailingSpace,topSpace and bottomSpace to zero, there are appear some extra spaces on left and right sides (so if I print subview's frame its origin will be 16 and size less on 32 than should be). So actually we get that leading and trailing spaces are not zeros...

正如您在图片前导空格上看到的 - 零，但 origin.x = 16

As you can see on picture leading space - zero, but origin.x = 16

早些时候我没有努力使用自动布局，所以我的问题是:是新 Xcode 的 bug 还是功能?

Earlier I wasn't working hard with auto layout, so my question is: Is it a bug of new Xcode or a feature?

附:所有框架和约束都已更新.

P.S. All frames and constraints updated.

推荐答案

iOS 8 增加了 内容边距" 到 UIView.来自 WWDC 2014 的 What's New in Cocoa Touch"视频讨论了内容边距(在标题下自适应边距")从大约 12 分 30 秒开始.

iOS 8 adds the concept of "content margins" to UIView. The "What's New in Cocoa Touch" video from WWDC 2014 discusses content margins (under the title "Adaptive Margins") starting at about 12m30s.

默认边距为每边 8 磅.布局约束的每一端都可以相对于视图的边缘而不是视图的真实边缘(使用 File > Open Quickly 转到 NSLayoutAttribute 的定义以查看可能性).

The default margins are 8 points on each side. Each end of a layout constraint can be relative to a view's margin instead of to the view's true edge (use File > Open Quickly to go to the definition of NSLayoutAttribute to see the possibilities).

您的约束是相对于边距".当您使用添加新约束"弹出框创建约束时，您可以选择它是否与边距相关:

Your constraint is "relative to margin". When you create the constraint with the "Add New Constraints" popover, you can choose whether it's margin-relative or not:

它总是默认为margin-relative；如果您不希望它们与边距相关，则每次添加约束时都必须关闭该复选框.

It always defaults to margin-relative; you have to turn the checkbox off every time you add constraints if you don't want them to be margin-relative.

您无法在屏幕截图的快速编辑弹出窗口中更改约束是否与边距相关.相反，双击约束以调出其完整的属性检查器.在那里，您可以使用弹出菜单为约束的每一端选择是否与边距相关:

You can't change whether a constraint is margin-relative in the quick-edit popover of your screen shot. Instead, double-click the constraint to bring up its full Attributes inspector. There, you can use the popup menus to select, for each end of the constraint, whether it's margin-relative or not:

这篇关于Xcode 6 beta 7:故事板在左右两侧增加了额外的空间的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！