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NSCache无需拦截key为空的情况 #29

@xiwuxisheng

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@xiwuxisheng

NSCache进行swizzing交换时,无需判断key为nil的情况,因为setObject:forKey方法里key不遵循NSCoping协议,而且通过本地测试(我用的iOS13)测试,当key为nil时,执行上述set方法不会crash,仍然可以继续执行

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