UIButton的文字图片布局实现以下效果
调用方式如下:
```
var btn1 = GJVerButton()
var btn2 = GJVerButton()
var btn3 = GJVerButton()
var btn4 = GJVerButton()
override func viewDidLoad() {
super.viewDidLoad()
for i in 0..<4{
let button = GJVerButton()
button.backgroundColor = .orange
button.setTitle("微信",for: .normal)
button.setTitleColor(.black,for: .normal)
button.setImage(.init(named:"wechat"),for: .normal)
button.contentEdgeInsets = UIEdgeInsets(top:20,left:20,bottom:20,right:20)
switch i {
case 0:
self.btn1 = button
case 1:
self.btn2 = button
case 2:
self.btn3 = button
default:
self.btn4 = button
}
}
view.addSubview(btn1)
view.addSubview(btn2)
view.addSubview(btn3)
view.addSubview(btn4)
let verh = 60
btn1.snp.makeConstraints{ make in
make.centerX.equalTo(view.snp.centerX)
make.top.equalTo(view.snp.top).offset(100)
}
btn2.snp.makeConstraints{ make in
make.centerX.equalTo(view.snp.centerX)
make.top.equalTo(btn1.snp.bottom).offset(verh)
}
btn3.snp.makeConstraints{ make in
make.centerX.equalTo(view.snp.centerX)
make.top.equalTo(btn2.snp.bottom).offset(verh)
}
btn4.snp.makeConstraints{ make in
make.centerX.equalTo(view.snp.centerX)
make.top.equalTo(btn3.snp.bottom).offset(verh)
}
btn1.imagePosition(style: .top, spacing: 10)
btn2.imagePosition(style: .bottom, spacing: 10)
btn3.imagePosition(style: .left, spacing: 10)
btn4.imagePosition(style: .right, spacing: 10)
}
```
GJVerButton.swift代码实现
```
class GJVerButton: UIButton {
enum RGButtonImagePosition {
case top //图片在上，文字在下，垂直居中对齐
case bottom //图片在下，文字在上，垂直居中对齐
case left //图片在左，文字在右，水平居中对齐
case right //图片在右，文字在左，水平居中对齐
}
func imagePosition(style: RGButtonImagePosition, spacing: CGFloat) {
let imageWidth = self.imageView?.frame.size.width
let imageHeight = self.imageView?.frame.size.height
var labelWidth: CGFloat! = 0.0
var labelHeight: CGFloat! = 0.0
labelWidth = self.titleLabel?.intrinsicContentSize.width
labelHeight = self.titleLabel?.intrinsicContentSize.height
var imageEdgeInsets = UIEdgeInsets.zero
var labelEdgeInsets = UIEdgeInsets.zero
switch style {
case.top:
imageEdgeInsets = UIEdgeInsets(top: -labelHeight-spacing/2,left:0,bottom:0,right: -labelWidth)
labelEdgeInsets = UIEdgeInsets(top:0,left: -imageWidth!,bottom: -imageHeight!-spacing/2,right:0)
break;
case.left:
imageEdgeInsets = UIEdgeInsets(top:0,left: -spacing/2,bottom:0,right: spacing)
labelEdgeInsets = UIEdgeInsets(top:0,left: spacing/2,bottom:0,right: -spacing/2)
break;
case.bottom:
imageEdgeInsets = UIEdgeInsets(top:0,left:0,bottom: -labelHeight!-spacing/2,right: -labelWidth)
labelEdgeInsets = UIEdgeInsets(top: -imageHeight!-spacing/2,left: -imageWidth!,bottom:0,right:0)
break;
case.right:
imageEdgeInsets = UIEdgeInsets(top:0,left: labelWidth+spacing/2,bottom:0,right: -labelWidth-spacing/2)
labelEdgeInsets = UIEdgeInsets(top:0,left: -imageWidth!-spacing/2,bottom:0,right: imageWidth!+spacing/2)
break;
}
self.titleEdgeInsets = labelEdgeInsets
self.imageEdgeInsets = imageEdgeInsets
}
}
```
