以编程方式更改中心X / Y的路线约束的乘数 [英] Programmatically Change multiplier of Alignment Constraint of Center X / Y

问题描述

如何以最简单的方式以编程方式更改乘数？

How can I programmatically change the multiplier in the simplest way?

对于Swift 2.0

For Swift 2.0

推荐答案

对于Y，如果您将图像的顶部设置为与SuperView顶部相等的常数，则常数为0。然后输入此代码：

So for Y, if you set the top of the image equal with a constant of 0 to the top of the superView. then enter this code:

@IBOutlet weak var topc: NSLayoutConstraint!


let heightOfSuperview = self.view.bounds.height
topc.constant = heightOfSuperview * 0.90 // this has the same effect as multiplier  

这等于Center.y乘数= 0.9：1

This is equivalent of Center.y multiplier = 0.9:1

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