swift 宏定义

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swift中没有宏定义了，但是OC当中宏的习惯一时还改不了，想实现类似效果

xcode → File → New → File → Cocoa Touch Class → Next

把uikit 下边的删掉，然后就可以写了（其实是声明的全局变量）

import UIKitlet ScreenWidth = UIScreen.main.bounds.size.widthlet ScreenHeight = UIScreen.main.bounds.size.height// rgb颜色转换func UIColorFromRGB (hex:String) -> UIColor {    var cString:String =  hex.trimmingCharacters(in: NSCharacterSet.whitespacesAndNewlines)    if (cString.hasPrefix("#")) {        cString = (cString as NSString).substring(from: 1)    }    let rString = (cString as NSString).substring(to: 2)    let gString = ((cString as NSString).substring(from: 2) as NSString).substring(to: 2)    let bString = ((cString as NSString).substring(from: 4) as NSString).substring(to: 2)        var r:CUnsignedInt = 0, g:CUnsignedInt = 0, b:CUnsignedInt = 0;    Scanner(string: rString).scanHexInt32(&r)    Scanner(string: gString).scanHexInt32(&g)    Scanner(string: bString).scanHexInt32(&b)    return UIColor(red: CGFloat(r) / 255.0, green: CGFloat(g) / 255.0, blue: CGFloat(b) / 255.0, alpha: CGFloat(1))}

编译一下，就可以使用了，weakself 好像没办法像OC一样宏定了只能在用的时候，这样写

   weak var weakSelf = self        var view = UIView.init(frame: CGRect(x:0,y:0,width:ScreenWidth,height:ScreenHeight))        self.view.backgroundColor=UIColorFromRGB(hex: "0Xe0e6ea")

参考链接： http://www.imooc.com/qadetail/68779

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