Swift3.0学习之Button

1.根据字符串的长度确定Button的长度（button的高度给定）

let hight:CGFloat = 30.0

let size1 = CGSize(width: getLabWidth(labelStr: "我的升级换代卡号多少", font: UIFont.systemFont(ofSize: 14), height: hight), height: hight)

let rect1 = CGRect(origin: CGPoint(x:40,y:200), size: size1)//设置Button的frame

let bt1:UIButton = UIButton.init(frame: rect1)

bt1.backgroundColor = UIColor.red//设置Button的背景色

bt1.titleLabel?.font = UIFont.systemFont(ofSize: 12)//设置Button的字体大小

bt1.titleLabel?.numberOfLines = 0;//设置Button的文本换行

bt1.setTitle("我的手机点哈卡的卡删繁就简哈哈放假萨法介绍", for: UIControlState.normal)//设置Button的文本内容

bt1.addTarget(self, action: #selector(didBt), for: UIControlEvents.touchUpInside)//设置Button的点击事件

bt1.isSelected = true//设置Button的选中状态

bt1.layer.borderWidth = 2.0;//设置Button的边框宽度

bt1.layer.borderColor = UIColor.blue.cgColor//设置Button的边框颜色

bt1.layer.cornerRadius = 10;//设置Button的圆角弧度

bt1.layer.masksToBounds = true

self.view.addSubview(bt1)//把button添加到控制器里

2.根据字符串的长度确定Button的高度（button的宽度给定）

let width:CGFloat = 60.0;

let size = CGSize(width: width, height: getLabHeigh(labelStr: "我的升级换代卡号多少", font: UIFont.systemFont(ofSize: 14), width: width))

let rect = CGRect(origin: CGPoint(x:20,y:100), size: size)//设置Button的frame

let bt:UIButton = UIButton.init(frame: rect)

bt.backgroundColor = UIColor.red//设置Button的背景色

bt.titleLabel?.font = UIFont.systemFont(ofSize: 12)//设置Button的文本字体大小

bt.titleLabel?.numberOfLines = 0;

bt.setTitle("我的升级换代卡号多少", for: UIControlState.normal)//设置Button的文本内容

bt.addTarget(self, action: #selector(didBt), for: UIControlEvents.touchUpInside)//设置Button的点击事件

bt.isSelected = true//设置Button的选中状态

self.view.addSubview(bt)

3.相关方法

@objc func didBt(bt:UIButton){

if bt.isSelected == true {

self.view.backgroundColor = UIColor.red

bt.isSelected = false

}else{

self.view.backgroundColor = UIColor.yellow

bt.isSelected = true

}

}

func getLabHeigh(labelStr:String,font:UIFont,width:CGFloat) -> CGFloat {

let statusLabelText: NSString = labelStr as NSString

let size = CGSize(width: width, height: 900)

let dic = NSDictionary(object: font, forKey: NSFontAttributeName as NSCopying)

let strSize = statusLabelText.boundingRect(with: size, options: .usesLineFragmentOrigin, attributes: dic as? [String : AnyObject], context: nil).size

return strSize.height

}

func getLabWidth(labelStr:String,font:UIFont,height:CGFloat) -> CGFloat {

let statusLabelText: NSString = labelStr as NSString

let size = CGSize(width:900,height: height)

let dic = NSDictionary(object: font, forKey: NSFontAttributeName as NSCopying)

let strSize = statusLabelText.boundingRect(with: size, options: .usesLineFragmentOrigin, attributes: dic as? [String : AnyObject], context: nil).size

return strSize.width

}