Swift 方法变动（笔记）

1.分类

extension UIView
{    
          /**摇摆*/    
      func shake()   
     {        let animation = CABasicAnimation(keyPath: "position")       
              animation.duration = 0.05        
              animation.repeatCount = 5        
              animation.autoreverses = true        
              animation.fromValue = NSValue(CGPoint: CGPointMake(self.center.x - 4.0, self.center.y))       
             animation.toValue = NSValue(CGPoint: CGPointMake(self.center.x + 4.0, self.center.y))        
            layer.addAnimation(animation, forKey: "position")    }
}

2.通知

// 发通知
NSNotificationCenter.defaultCenter().postNotificationName("testNotification", object: nil)

// 收通知
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(test), name: "testNotification", object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(OneVc.test(_:)), name: "testNotification", object: nil)
//NSNotificationCenter.defaultCenter().addObserver(self, selector: "test", name: "testNotification", object: nil)

3.宏

Swift没有#define了，但是可以用let，还能用全局函数

func RGB(r:CGFloat,g:CGFloat,b:CGFloat) -> UIColor {
    return UIColor.init(red: r/255.0, green: g/255.0, blue: b/255.0, alpha: 1)
}

4.协议代理

protocol OneVcDelegate :NSObjectProtocol{
    func changeColor(color:UIColor)
}

class OneVc: UIViewController,OneVcDelegate {
    
    override func viewDidLoad()
    {
        super.viewDidLoad()
    }
    
    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        let vc = TwoVc()
        vc.delegate = self;
        self.navigationController?.pushViewController(vc, animated: true)
    }
    
    func changeColor(color:UIColor) {
        self.view.backgroundColor = color
    }

}
}

class TwoVc: UIViewController {
    
    weak var delegate :OneVcDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }
    
    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        self.delegate!.changeColor(UIColor.redColor())
        self.navigationController?.popViewControllerAnimated(true)
    }
}