diff: /../Podfile.lock: No such file or directory   
  diff: /Manifest.lock: No such file or directory error: The sandbox is not in sync with the Podfile.lock. 
  Run 'pod install' or update your CocoaPods installation.

class UserInfo: NSObject {
    var name: String?
    var age: Int = 0
    var address: String?
    init(dict: [String:Any]) {
        super.init()
        setValuesForKeys(dict)
    }
}
let userInfo = UserInfo(dict: ["name":"Len", "age":24, "address":"ShenZhen"])
        print("\(userInfo.name) \(userInfo.age) \(userInfo.address)")

import UIKit
extension UIColor {
    
    func rgb(r: Float, g: Float, b:Float, a:Float = 1.0) -> UIColor {
        return UIColor(colorLiteralRed: r/255.0, green: g/255.0, blue: b/255.0, alpha: a)
    }
    
    func hexColor(rgb: Int, a: Float = 1.0) -> UIColor {
        let red   = CGFloat((rgb & 0xFF0000) >> 16) / 255.0
        let green = CGFloat((rgb & 0xFF00) >> 8) / 255.0
        let blue  = CGFloat(rgb & 0xFF) / 255.0
        return UIColor(red: red, green: green, blue: blue, alpha: CGFloat(a))
    }
    
    convenience public init(hexColor: Int, a:CGFloat = 1.0) {
        let red   = CGFloat((hexColor & 0xFF0000) >> 16) / 255.0
        let green = CGFloat((hexColor & 0xFF00) >> 8) / 255.0
        let blue  = CGFloat(hexColor & 0xFF) / 255.0
        self.init(red: red, green: green, blue: blue, alpha: a)
    }
}
extension UIButton {
    convenience init(title: String, color: UIColor = UIColor(hexColor: 0x000000)) {
        self.init()
        self.setTitle(title, for: .normal)
        self.setTitleColor(color, for: .normal)
    }
}
testButton = UIButton(title: "hahaha", color: UIColor(hexColor: 0xff453b))

// 没有 func -> 不让调用
// 没有() -> 不让重载
// 在对象被销毁前自动调用
// 类似于 OC 的 dealloc
deinit {
	
	// 跟踪对象的销毁
	// 必须释放的
	
	/**
		使用场景
		通知：不释放不会崩溃，但是会泄露
		KVO：不释放会崩溃
		NSTimer：不销毁会循环引用
		CADisplayLink
	*/
	
}