NSArray的扫描输出

    NSArray *array=@[@"AA",@"BB",@"CC",@"DD"];

    

    [array enumerateObjectsUsingBlock:^(id obj,NSUInteger idx,BOOL *stop) {

        NSLog(@"%@",obj);

    }];

    

    [arrayenumerateObjectsAtIndexes:[NSIndexSetindexSetWithIndexesInRange:NSMakeRange(1,3)]options:NSEnumerationReverseusingBlock:^(id obj,NSUInteger idx, BOOL *stop) {

         NSLog(@"%@",obj);

    }];