ios xcode 1.swift中的keypath、类与协议的组合类型

1.Keypath

class User {

var name: String = "张三"

var age: Int = 9

}

let user1 = User()

user1.name = "李四"

user1.age = 10

let name = user1[keyPath: \User.name]

let age = user1[keyPath: \User.age]

print(name,age) // 李四 10

2. 类与协议的组合类型

protocol Shakeable {

func shake()

}

extension UIButton: Shakeable {

func shake() {

print("shake~~~~~",self.tag)

}

}

override func viewDidLoad() {

super.viewDidLoad()

let titles = ["按钮1", "按钮2", "按钮3"]

let colors = [UIColor.red, UIColor.blue, UIColor.orange]

let buttons = zip(0..., titles).map { (i, title) -> UIButton in

let button = UIButton(type: .system)

button.frame = CGRect(x: i * 100, y: 200, width: 80, height: 80)

button.setTitle(title, for:.normal)

button.tag = i

self.view.addSubview(button)

return button

}

zip(buttons, colors).forEach({

$0.0.backgroundColor = $0.1

})

shakeEm(controls: buttons)

}

func shakeEm(controls: [UIControl & Shakeable]) {

for control in controls where control.isEnabled {

control.shake()

}

}

打印结果 shake~~~~~ 0 shake~~~~~ 1 shake~~~~~ 2

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