type 'simple Class' does not conform to protocol 'Example Protocol'错误
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在看swift教程中“接口和扩展”这小部分。在编写时提示“type 'simple Class' does not conform to protocol 'Example Protocol'”的错误,原因是simpleClass没有完全实现protocol中定义的方法。检查了下代码,原来是自己把方法名给写错了。
mutating 只针对 struct 和 enum 。
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