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1 Selector是Objective-C一个非常强大的特性，合理使用Selector可以大大简化实现并避免重复代码。但NSObject提供 的performSelector最多只支持两个参数，对于两个以上的参数就无能为力了。一番调查后针对NSObject增加了如下扩展，使得 performSelector可以支持传入参数数组。多个参数就不再是问题了。  2 @interface NSObject (Addition)  3  4 - (id)performSelector:(SEL)selector withObjects:(NSArray *)objects;  5  6 @end  7  8 @implementation NSObject (Addition)  9 10 - (id)performSelector:(SEL)selector withObjects:(NSArray *)objects { 11     NSMethodSignature *signature = [self methodSignatureForSelector:selector]; 12     if (signature) { 13         NSInvocation* invocation = [NSInvocation invocationWithMethodSignature:signature]; 14         [invocation setTarget:self]; 15         [invocation setSelector:selector]; 16         for(int i = 0; i < [objects count]; i++){ 17             id object = [objects objectAtIndex:i]; 18             [invocation setArgument:&object atIndex: (i + 2)];        19         } 20         [invocation invoke]; 21         if (signature.methodReturnLength) { 22             id anObject; 23             [invocation getReturnValue:&anObject]; 24             return anObject; 25         } else { 26             return nil; 27         } 28     } else { 29         return nil; 30     } 31 } 32 @end