Button中UILabel和UIImage的布局

要想很好的完成Button中UILabel和UIImage的布局,我们可以简单的分成两步。

• 确定UILabel和UIImage的位置(左右 或者 右左)
• imageEdgeInsets titleEdgeInsets(这里用到的两个属性)
• 将两者看成一个整体完成相应的布局
• contentEdgeInsets(这里用到的属性)

import UIKit

var str = "Hello, playground"

let btn = UIButton(frame: CGRect(x: 0, y: 0, width: 100, height: 44))
btn.setTitle("Gaol", forState: .Normal)

let image = UIImage(named: "icon_check")
btn.setImage(image, forState: .Normal)

//默认状态
btn.imageEdgeInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
btn.titleEdgeInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
btn.contentEdgeInsets = UIEdgeInsets(top: 10, left: 0, bottom: 10, right: 0)


//图在右边
let imageWidth = btn.imageView!.bounds.size.width
let labelWidth = btn.titleLabel!.bounds.size.width
btn.imageEdgeInsets = UIEdgeInsets(top: 0, left: labelWidth, bottom: 0, right: -labelWidth)
btn.titleEdgeInsets = UIEdgeInsets(top: 0, left: -imageWidth, bottom: 0, right: imageWidth)
btn.contentEdgeInsets = UIEdgeInsets(top: 10, left: 0, bottom: 10, right: 0)