数组的遍历方法

        NSArray * array = @[@"one",@"two",@"three"];
        for (int i = 0; i < array.count; i++)
        {
            NSString * str = array[i];
            NSLog(@"array[%d] = %@",i,str);
        }

        for (NSString * str in array)
        {
            NSLog(@"str = %@",str);
        }

 NSArray * array3 = @[@"one",@"two",@"three"];
        NSEnumerator * enumerateor =  [array3 objectEnumerator];
        NSString * value;
        while (value = [enumerateor nextObject]) {
            NSLog(@"enum str %@",value);
        }