App Transport Security has blocked a cleartext HTTP (http://) resource load since it is insecure. 报错处理.

在做一个网络应用时,解析json时报错 App Transport Security has blocked a cleartext HTTP (http://) resource load since it is insecure. Temporary exceptions can be configured via your app's Info.plist file. fatal error: unexpectedly found nil while unwrapping an Optional value

报错原因是xcode禁止明文http传输.通过修改info.plist可解决:

1. 添加App Transport Security Settings,类型是Dictionary
2. 在App Transport Security Settings添加Allow Arbitrary Loads,类型是Boolean,值是YES

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不过从苹果官方目前发布出来的消息上看， 在 2017 年一月份开始，就不再允许开发者打开 NSAllowsArbitraryLoads 设置了。

这里有详细介绍