OC -基础（八） 学习中。。。

    _scrollView = [[UIScrollView alloc] init];    _scrollView.frame = CGRectMake(0, 0, 320, 560);    _scrollView.bounces = YES;    _scrollView.pagingEnabled = YES;    _scrollView.scrollEnabled = YES;    _scrollView.contentSize=CGSizeMake(320*3, 576);    _scrollView.alwaysBounceVertical = YES;    _scrollView.alwaysBounceHorizontal =YES;    _scrollView.showsVerticalScrollIndicator = YES;    _scrollView.showsHorizontalScrollIndicator = YES;    _scrollView.backgroundColor =[UIColor yellowColor];    for (int i =0; i<3; i++) {        NSString * str;        if(i==0){        str = [NSString stringWithFormat:@"%d.png",i+1];        }else{        str = [NSString stringWithFormat:@"%d.jpg",i+1];        }        UIImage*  image = [UIImage imageNamed:str];        UIImageView * iView = [[UIImageView alloc] init];        iView.image = image;        iView.frame = CGRectMake(320*i, 0, 320, 576);        [_scrollView addSubview:iView];    }        [self.view addSubview:_scrollView];