消除performSelector:警告的方法

performSelector：方法将会由于不知道它的选择器而致使内存泄露。ARC编译器会给出一个警告:web "performSelector may cause a leak because its selector is unknown" 能够利用IMP和函数指针方法配合解决：bash SEL selector = NSSelectorFromString(@"someMethod");

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