Xcode AutoLayout，使边距与高度成比例
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Xcode AutoLayout, Make Margin proportional with height
提问by Mostafa Mohamed Raafat
I am having a big time figuring out how to make the margin of two objects proportional. If i choose aspect ratio on Xcode it gives me the option for adjust the height of my object proportional screen height. and thats not my case. I want the margin between a button and screen bottom to be proportional to screen height. And i want it to be done using Xcode "No Code".
我很想弄清楚如何使两个对象的边距成比例。如果我在 Xcode 上选择纵横比，它会为我提供调整对象比例屏幕高度的选项。这不是我的情况。我希望按钮和屏幕底部之间的边距与屏幕高度成正比。我希望它使用 Xcode“无代码”来完成。
Your support is highly appreciated.
非常感谢您的支持。
Thank you
谢谢
采纳答案by GaétanZ
Use the multiplier property of NSLayoutConstraint !
使用 NSLayoutConstraint 的 multiplier 属性！
First, set the equal height constraint from your view to its superview with the multiplier you wish. You can use Ctrl + drag from your view to the superview.
首先，使用您希望的乘数设置从您的视图到其超视图的等高约束。您可以使用 Ctrl + 从视图拖动到超级视图。
Then set another constraint at 0 from the top of your view to the superview and a equal width constrain with a multiplier to 1 from your view to the superview.
然后在从视图顶部到父视图的 0 处设置另一个约束，并从视图到父视图设置一个等宽约束，乘数为 1。
Done !
完毕 ！
回答by ChikabuZ
回答by Rory McKinnel
I know you wanted no code, but I think you would be best to use a height constraint. Add a constraint for height for the margin and CTRL drag it into your header file to get something like:
我知道您不需要任何代码，但我认为您最好使用高度约束。为边距添加高度约束，然后按 CTRL 将其拖入您的头文件中以获得类似以下内容：
@property (strong, nonatomic) IBOutlet NSLayoutConstraint *myMarginHeightConstraint;
You need a property which contains the fraction of the screen height for the margin:
您需要一个属性，其中包含边距的屏幕高度部分：
@property CGFloat myHeightFraction;
Then add this in viewDidLoad.
然后在 viewDidLoad 中添加它。
- (void)viewDidLoad
{
[super viewDidLoad];
self.myHeightFraction = 0.1; // e.g to get margin at 10% of height
myMarginHeightConstraint.constant = myHeightFraction * [[UIScreen mainScreen] bounds].size.height;
...
}
