启动屏幕厦门国际银行：缺少宽度/高度限制 [英] Launch Screen XIB: Missing Width / Height Constraints

问题描述

使用的 X code 6 后，我建立一个iOS应用为目标的 iOS8上。

Using Xcode 6, I am building an iOS app that targets iOS8.

我工作的一个 LaunchScreen.xib 文件，从菜单中创建：文件＆gt;新＆GT;文件＆gt; iOS版 - 用户界面 - 屏幕启动。 使用自动布局已启用。

I'm working on a LaunchScreen.xib file, created from the menu: File > New > File > iOS - User Interface - Launch Screen. "Use Auto Layout" is enabled.

在厦门国际银行的主要的UIView ，我已经放在一个的UIImageView 。我想补充的宽度和高度的限制，使的UIImageView 的大小与容器相同。然而，X code没有让我这样做。我只能​​间距和对齐工作

Inside the XIB's main UIView, I've placed a UIImageView. I would like to add width and height constraints, so that the UIImageView has the same size as the container. However, Xcode doesn't let me do that: I can only work with spacing and alignment.

下面是我所看到的：

我是什么做错了吗？为什么我不能看到一个菜单像下面这样？

What am I doing wrong? Why can't I see a menu like the following?

我知道我可以通过设置前导空格，尾随的空间，顶部空间和容器底部的空间达到0相同的结果，但我也想明白这里发生了什么。

I know I could reach the same result by setting leading space, trailing space, top space, and bottom space to container to 0, but I would also like to understand what's happening here.

推荐答案

编辑：

X code 7 现在默认为启动画面一个Storyboard文件。结果
如下所述，不像XIBs，故事板文件允许你设置宽度和高度的限制，以根的UIView 。

Xcode 7 now defaults to a Storyboard file for the Launch Screen.
As explained below, unlike XIBs, Storyboard files allow you to set width and height constraints to the root UIView.

我一直没能找到一个官方的解释，为什么XIBs那样做，时，他们有一个的UIView 在根 。结果
看起来怪我那是什么我们提供了一个默认值（ LaunchScreen.xib ）未设置为完全一样，我们已经习惯了故事板

I haven't been able to find an official explanation as to why XIBs behave like that, when they have a UIView at the root.
What looks weird to me is that what we are provided with as a default (LaunchScreen.xib) isn't set up to behave exactly like the Storyboards we've got used to.

我选择了第一种方案是使用故事板绘制启动屏幕，而不是厦门国际银行：

The first solution I opted for was using a Storyboard to draw the Launch Screen, instead of a XIB:

• 删除 LaunchScreen.xib


• 创建一个 LaunchScreen.storyboard （菜单：文件＆gt;新建＆GT;文件＆gt;的iOS - 用户界面 - 故事板）


• 转到您的项目属性，选择导航到你的目标的一般属性，然后在启动画面文件组合框
选择 LaunchScreen.storyboard

• 开启 LaunchScreen.storyboard ，添加一个视图控制器，和确定可勾选在初始视图控制器盒


• 您现在可以在视图控制器的查看你的启动屏幕工作，你会得到的宽度和高度限制，我最初找

• Delete LaunchScreen.xib
• Create a LaunchScreen.storyboard (Menu: File > New > File > iOS - User Interface - Storyboard)
• Go to your project properties, select navigate to your target's general properties and select LaunchScreen.storyboard in the "Launch Screen File" combo box
• Open LaunchScreen.storyboard, add a View Controller, and make sure to tick the "Is Initial View Controller Box"
• You can now work on the View Controller's View as your Launch Screen, and you'll get the width and height constraints I was initially looking for

这是另一种解决方案是在 LaunchScreen.xib 删除默认的的UIView ，并用视图控制器取代它。< BR>
就像在previous情况下，如果你这样做，你可以在视图控制器的视图的工作，你会得到一般的约束菜单。

An alternative solution is removing the default UIView in LaunchScreen.xib and replacing it with a View Controller.
Just like in the previous case, if you do so, you can work on the View Controller's View, and you'll get the usual constraint menu.

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