在 Swift 中实现循环/遍历有如下几种方式：
1.1 for-in
1.1.1 遍历区间
1.1.1.1 顺序遍历for index in 0 ..< 5 { print(index)}输出：01234
1.1.1.2 逆序遍历for index in (0 ... 5).reversed() { ...
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ReactiveCocoa 10.0 7.3 Objective-CReactiveCocoa (RAC) is a Cocoa framework inspired by Functional Reac...
swift中没有了#Define这种宏定义了，可以用let来声明常量来取代,判断当前系统版本
let IS_IOS7 = (UIDevice.currentDevice().systemVersion as NSString).doubleValue >= 7.0 let IS_IOS8 = (UIDevice.current...
