标签：ble add ring gre 技术分享 selector str rand target
一、思维导图
二、
代码
//创建UIView 和按钮 let views = UIView(frame: CGRect(x:20, y: 20, width: 100, height: 100))//FIXME:改变viewsframe views.backgroundColor = UIColor.yellow view.addSubview(views) //MARK: 创建一个按钮 let Button2 = UIButton(type: .contactAdd) Button2.backgroundColor = UIColor.red //FIXME:sfsl Button2.frame = views.bounds views.addSubview(Button2) // Button2 .addTarget(self, action: #selector(button2Click), for:) Button2.addTarget(self, action: #selector(button2Click), for: .touchUpInside) } //MARK:-- methods response func button2Click() { print("按钮单击") }
//常量和变量
1 let a = 10 2 let b:Double = 105.3 3 // Binary operator ‘+‘ cannot be applied to operands of type ‘Int‘ and ‘Double‘ 4 print(a+Int(b)) 5 6 7 var name:String = "Hello Word" //不管是变量还是常量必须初始化，且常量的值不能改变 8 name = "我是 Hello Word" 9 print(name)
//分支和三运算
//1 if f
let a = 10
if a > 5 {
print("a>5")
}else{
print("a<5")
}
//2 三目
// a > 5 ? print("a大") : print("a小")
//或写成
a > 5 ? print("a大大大") :()
标签：ble add ring gre 技术分享 selector str rand target
原文地址：http://www.cnblogs.com/TheYouth/p/6259951.html
