1.根據字符串的長度確定Button的長度（button的高度給定）
let hight:CGFloat = 30.0
let size1 = CGSize(width: getLabWidth(labelStr: "我的升級換代卡號多少", font: UIFont.systemFont(ofSize: 14), height: hight), height: hight)
let rect1 = CGRect(origin: CGPoint(x:40,y:200), size: size1)//設置Button的frame
let bt1:UIButton = UIButton.init(frame: rect1)
bt1.backgroundColor = UIColor.red//設置Button的背景色
bt1.titleLabel?.font = UIFont.systemFont(ofSize: 12)//設置Button的字體大小
bt1.titleLabel?.numberOfLines = 0;//設置Button的文本換行
bt1.setTitle("我的手機點哈卡的卡刪繁就簡哈哈放假薩法介紹", for: UIControlState.normal)//設置Button的文本內容
bt1.addTarget(self, action: #selector(didBt), for: UIControlEvents.touchUpInside)//設置Button的點擊事件
bt1.isSelected = true//設置Button的選中狀態
bt1.layer.borderWidth = 2.0;//設置Button的邊框寬度
bt1.layer.borderColor = UIColor.blue.cgColor//設置Button的邊框顏色
bt1.layer.cornerRadius = 10;//設置Button的圓角弧度
bt1.layer.masksToBounds = true
self.view.addSubview(bt1)//把button添加到控制器里
2.根據字符串的長度確定Button的高度（button的寬度給定）
let width:CGFloat = 60.0;
let size = CGSize(width: width, height: getLabHeigh(labelStr: "我的升級換代卡號多少", font: UIFont.systemFont(ofSize: 14), width: width))
let rect = CGRect(origin: CGPoint(x:20,y:100), size: size)//設置Button的frame
let bt:UIButton = UIButton.init(frame: rect)
bt.backgroundColor = UIColor.red//設置Button的背景色
bt.titleLabel?.font = UIFont.systemFont(ofSize: 12)//設置Button的文本字體大小
bt.titleLabel?.numberOfLines = 0;
bt.setTitle("我的升級換代卡號多少", for: UIControlState.normal)//設置Button的文本內容
bt.addTarget(self, action: #selector(didBt), for: UIControlEvents.touchUpInside)//設置Button的點擊事件
bt.isSelected = true//設置Button的選中狀態
self.view.addSubview(bt)
3.相關方法
@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
}