UIButton是我们经常用的一个控件，它是继承自UIControl的，下面就总结一下相关属性及用法：
1.UIButton的创建
a.不带样式的：
let btn: UIButton = UIButton()
b.带样式的：
let btns:UIButton =UIButton(type: UIButtonType)；
其中UIButtonType是一个枚举如下所示：
publicenum UIButtonType :Int {
case Custom // no button type 自定义样式按钮
@available(iOS 7.0,*)
case System // standard system button //系统的样式按钮
case DetailDisclosure
case InfoLight
case InfoDark
case ContactAdd//联系人按钮
public staticvar RoundedRect: UIButtonType { get }// Deprecated,use UIButtonTypeSystem instead
}
用法如下：
let btn: UIButton = UIButton(type: .Custom)
2.UIButton设置字内容和颜色
btn.setTitle("按钮",forState: .Normal)
btn.setTitleColor(UIColor.whiteColor(),forState: .Normal)
3.UIButton设置背景颜色和背景图片
btn.backgroundColor =UIColor.blackColor()
btn.setBackgroundImage(UIImage(named:"1"),forState: .Normal)
4.UIButton设置字体大小
btn.titleLabel?.font =UIFont.systemFontOfSize(20)
5.禁用UIButton
btn.enabled =false //禁止按钮，默认为true
6.设置圆角
btn.layer.cornerRadius = 8
7.设置背景图片为圆角（因为我们直接设置UIButton圆角时，图片不会变为圆角）
buttonImage.setImage(UIImage(named:"1"),forState: UIControlState.Normal)
//设置背景图片为圆角
buttonImage.imageView?.layer.cornerRadius = 50
8.在UIButton上添加图片和文字，有时需要我们调整，此时需要：
方向为逆时针方向，上、左、下、右依次去设置的
btn.imageEdgeInsets =UIEdgeInsetsMake(top: CGFloat,left: CGFloat,bottom: CGFloat,right: CGFloat)
btn.titleEdgeInsets =UIEdgeInsetsMake(top: CGFloat,right: CGFloat)
例子如下：
//创建一个图片一个文字的按钮 let btn2: UIButton = UIButton(type: .Custom) btn2.frame = CGRectMake(50,100,120,35) btn2.setImage(UIImage(named: "1"),forState: .Normal) btn2.backgroundColor = UIColor.blackColor() btn2.titleLabel?.font = UIFont.systemFontOfSize(20) btn2.imageView?.contentMode = UIViewContentMode.ScaleAspectFit btn2.setTitle("图片按钮",forState: .Normal) //偏移量，分别为上下左右 btn2.imageEdgeInsets = UIEdgeInsetsMake(0,-50,0) btn2.titleEdgeInsets = UIEdgeInsetsMake(0,-80,5) btn2.setTitleColor(UIColor.whiteColor(),forState: .Normal) btn2.adjustsImageWhenHighlighted = false self.view.addSubview(btn2)9 .添加按钮的点击事件
第一种是不带参数的，第二种是带参数的
btn.addTarget(self,action:"click",forControlEvents: .TouchUpInside)
btn.addTarget(self,action:"clicks：",forControlEvents: .TouchUpInside)
第一种：
func click(){}
第二种：
func clicks(sender:UIButton){}
写的代码如下：
func initButtonView() {
//创建有状态的按钮
let btn: UIButton = UIButton(type: .Custom)
btn.frame = CGRectMake(50,20,30)
btn.setTitle("点击按钮",forState: .Selected)
btn.setTitle("未点击",forState: .Normal)
btn.backgroundColor = UIColor.blackColor()
btn.addTarget(self,action: "clickBtn:",forControlEvents: .TouchUpInside)
self.view .addSubview(btn)
//创建无状态的按钮
let btn1: UIButton = UIButton()
btn1.frame = CGRectMake(50,60,30)
btn1.setTitle("Normal",forState: .Normal)
btn1.backgroundColor = UIColor.blueColor()
self.view.addSubview(btn1)
//创建一个图片一个文字的按钮
let btn2: UIButton = UIButton(type: .Custom)
btn2.frame = CGRectMake(50,forState: .Normal)
btn2.adjustsImageWhenHighlighted = false
self.view.addSubview(btn2)
//创建禁止按钮
let btn3: UIButton = UIButton(type: .Custom)
btn3.frame = CGRectMake(50,140,35)
btn3.setTitle("点击按钮",forState: .Highlighted)
btn3.setTitle("禁止按钮",forState: .Normal)
btn3.enabled = false //禁止按钮，默认为true
btn3.setTitleColor(UIColor.redColor(),forState: .Disabled)
btn3.backgroundColor = UIColor.purpleColor()
self.view.addSubview(btn3)
//创建圆角按钮
let btn4: UIButton = UIButton(type: .Custom)
btn4.frame = CGRectMake(50,180,35)
btn4.backgroundColor = UIColor.blackColor()
btn4.setTitle("圆角按钮 ",forState: .Normal)
btn4.setTitleColor(UIColor.whiteColor(),forState: .Normal)
btn4.layer.cornerRadius = 8
self.view.addSubview(btn4)
//部分圆角按钮，主要利用layer的mask属性，在tongguoCAShaperLayer和UIBezierPath来画
let btn5: UIButton = UIButton(type: .Custom)
btn5.frame = CGRectMake(50,220,35)
btn5.backgroundColor = UIColor.blackColor()
btn5.setTitle("部分圆角按钮",forState: .Normal)
btn5.setTitleColor(UIColor.whiteColor(),forState: .Normal)
let shape: CAShapeLayer = CAShapeLayer()
let bepath: UIBezierPath = UIBezierPath(roundedRect: btn5.bounds,byRoundingCorners: [UIRectCorner.TopRight,UIRectCorner.TopLeft,UIRectCorner.BottomLeft],cornerRadii: CGSize(width: 8,height: 8))
UIColor.blackColor().setStroke()
shape.path = bepath.CGPath
btn5.layer.mask = shape
self.view.addSubview(btn5)
//创建带边框的按钮
let btn6: UIButton = UIButton(type: .Custom)
btn6.frame = CGRectMake(50,260,35)
btn6.setTitle("边框按钮",forState: .Normal)
btn6.setTitleColor(UIColor.blackColor(),forState: .Normal)
btn6.layer.borderColor = UIColor.blackColor().CGColor
btn6.layer.borderWidth = 1
btn6.layer.cornerRadius = 8
self.view.addSubview(btn6)
//显示提示信息的UILabel
labelText = UILabel()
labelText.frame = CGRectMake(50,300,44)
labelText.textColor = UIColor.orangeColor()
self.view.addSubview(labelText)
let btns: UIButton = UIButton(type: .Custom)
btns.frame = CGRectMake(<#T##x: CGFloat##CGFloat#>,<#T##y: CGFloat##CGFloat#>,<#T##width: CGFloat##CGFloat#>,<#T##height: CGFloat##CGFloat#>)
btn.setTitle("按钮",forState: .Normal)
btn.setTitleColor(UIColor.whiteColor(),forState: .Normal)
btn.backgroundColor = UIColor.blackColor()
btn.setBackgroundImage(UIImage(named: "1"),forState: .Normal)
btn.imageEdgeInsets = UIEdgeInsetsMake(<#T##top: CGFloat##CGFloat#>,<#T##left: CGFloat##CGFloat#>,<#T##bottom: CGFloat##CGFloat#>,<#T##right: CGFloat##CGFloat#>)
btn.titleEdgeInsets = UIEdgeInsetsMake(<#T##top: CGFloat##CGFloat#>,<#T##right: CGFloat##CGFloat#>)
btn.addTarget(self,action: "click",forControlEvents: .TouchUpInside)
}
func clickBtn(sender: UIButton){
sender.selected = !sender.selected
labelText.text = "点击了按钮"
}
效果图如下：
