Swift - 动态改变UIButton的大小 [英] Swift - dynamically change size of UIButton

问题描述

我正在尝试动态更改UIButton的框架，但它不起作用。

I'm trying to dynamically change frame of UIButton, but it doesn't work.

@IBOutlet weak var button1: UIButton!

@IBAction func btn_move2_touchupinside(sender: AnyObject, forEvent event: UIEvent) {
           button1.frame = CGRectMake(0, 0, 100, 100)
}

我猜我应该在帧后更改时重新加载按钮。
有人可以提供帮助吗？

I'm guessing that I should reload button after frame is changed. Can anybody help?

推荐答案

自动布局阻止您更新按钮的框架。以下3种不同的方法可以使这项工作从最简单到最难设置：

Auto Layout is preventing you from updating your button's frame. Here are 3 different ways you can make this work from easiest to set up to hardest:

1. 关闭自动布局。在Interface Builder中，单击View Controller。然后在最右侧的文件检查器中，取消选中使用自动布局。

定义按钮在编程 viewDidLoad中：

let button = UIButton.buttonWithType(.System) as UIButton
button.frame = CGRectMake(200, 200, 100, 100)
button.addTarget(self, action: "btn_move2_touchupinside:forEvent:", forControlEvents: .TouchUpInside)
button.setTitle("New Button", forState: .Normal)
self.view.addSubview(button)

为按钮设置4个约束（从超视图前导边距开始的水平偏移，从顶部布局向导垂直偏移，宽度和高度）。为这些约束设置 @IBOutlets ，然后在代码中更新它们的常量属性。

Set up 4 constraints for your button (horizontal offset from superview leading margin, vertical offset from top layout guide, width, and height). Set up @IBOutlets for these constraints and then update their constant properties in code.

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