MonoTouch:如何在运行时更改控件的位置? [英] MonoTouch: How to change control's location at runtime?

问题描述

我想在运行时更改 UIImageView 的位置.在 IB 中，我可以更改 X 坐标以重新定位它.所以，我试过这个代码:

I want to change the location of an UIImageView at runtime. In IB, I can change X coordinate to relocate it. So, I tried this code:

imageView.Frame.X = 25;

但它没有任何影响.为什么?我对其他控件也有同样的问题.如何让它发挥作用?

But it doesn't have any effect. Why? I have the same problem for other controls as well. How to make it work?

推荐答案

Frame 属性是一个值类型，这意味着如果你这样做:

The Frame property is a value type, this means that if you do:

imageView.Frame.X = 25

你实际上在做什么:

var temp = imageView.Frame;
temp.X = 25;

该值永远不会到达 imageView.对于值类型，您必须分配一个完全构造的类型，例如:

The value never reaches the imageView. With value types, you have to assign a fully constructed type, so for example:

var current = imageView.Frame;当前.X = 25;imageView.Frame = 当前；

var current = imageView.Frame; current.X = 25; imageView.Frame = current;

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