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苹果开发中文网站读URLNavigator源码
source link: http://www.cocoachina.com/ios/20190430/26893.html
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URLNavigator?是Swift版本的Router。Router的主要作用是解耦。之前在各个ViewController间跳转，需要import ViewController，这样就造成ViewController之间的依赖，也即耦合。通过router不需要再import ViewController。所有的只要import router，只依赖router这一个类，router里再去import 其他的ViewController，这样，就达到我们说的解耦。
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