关于应用在Xcode8上运行时的报错：Assigning to 'id<XXDelegate>' from incompatible type...
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如上图这样的报错基本上是由两种情况造成的：
1、没有遵守协议（基本上都是这种情况造成的）
解决办法：遵守这个协议
2、strong 类型不兼容
解决办法：将 strong 改为 weak
注意：有时 Xcode 不能及时清楚警告和错误，需要手动clean一下（ Product ->Clean）
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