objective-c SEL 跟 NSString 轉換!!

SEL 轉 NSString
NSString *msg = [NSString stringWithFormat:@"%@ doesn't exist!",NSStringFromSelector(selector)];
常常用來記錄一些錯誤!!;
//-----------------------------------------------
NSString 轉 SEL
NSString *actionName = [NSString stringWithFormat:@"%@:",action.m_Action];
SEL actionFunc = NSSelectorFromString(actionName);
then you can do like:
[self performSelector:actionFunc];
常常用來 在runtime  動態產生 SEL 

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