变量@variable已分配但其值从未使用

Variable @variable assigned but value never used.

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变量的已分配内存量取决于几个因素。

The amount of memory allocated for a variable depends on a few factors.

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虽然此组件在视图控制器类内不具有已分配的实例变量，但是您需要定义类delegate。

This component does not have an assigned instance variable inside the view controller class, but you need to define the class delegate.

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