08闭包.md

闭包

• 闭包定义* 闭包简化 - 尾随闭包* 闭包参数* 闭包返回值* 闭包的循环引用

swiftweak var weakSelf = selfdemo("zhangsan") { (_) -> Int in print(weakSelf?.view.backgroundColor)

 return 20
}