消除performSelector:警告的方法

performSelector：方法將會由於不知道它的選擇器而致使內存泄露。ARC編譯器會給出一個警告:web "performSelector may cause a leak because its selector is unknown" 能夠利用IMP和函數指針方法配合解決：bash SEL selector = NSSelectorFromString(@"someMethod");

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