ios - 启用分页的 scrollView 无法正常工作？ ( objective-C )

Question

我想用三个 UIView 创建分页 scrollView。而不是想将 imageView 作为 subview 添加到这些 UIView 中。我无法弄清楚如何计算 imageViews 的框架。当我在没有 imageViews 的情况下运行代码时，它工作得很好。

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.scrollView.delegate = self;
    self.scrollView.frame = self.view.frame;

    NSArray *colorsArray = [NSArray arrayWithObjects:[UIColor blueColor], [UIColor yellowColor],[UIColor greenColor], nil];

    NSArray *imagesArray = [NSArray arrayWithObjects:[UIImage imageNamed:@"123.png"],[UIImage imageNamed:@"13.png"],[UIImage imageNamed:@"12.png"],nil];

    for (int i = 0; i < colorsArray.count; i++) {
        CGRect frame;
        frame.origin.x = self.view.frame.size.width * i;
        frame.size = self.view.frame.size;

        self.scrollView.pagingEnabled = YES;

        UIView *view = [[UIView alloc] initWithFrame:frame];
        view.backgroundColor = [colorsArray objectAtIndex:i];

        UIImageView *imageView = [[UIImageView alloc] initWithFrame:view.frame];
        imageView.contentMode = UIViewContentModeScaleAspectFit;
        imageView.image = [imagesArray objectAtIndex:i];
        [view addSubview:imageView];

        [self.scrollView addSubview:view];

    }

    self.scrollView.contentSize = CGSizeMake(self.view.frame.size.width * colorsArray.count, self.scrollView.frame.size.height);

    self.pageControl.numberOfPages = 3;
    self.pageControl.currentPage = 0;
}


- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    CGFloat pageWidth = CGRectGetWidth(self.scrollView.bounds);
    CGFloat pageFraction = self.scrollView.contentOffset.x / pageWidth;
    self.pageControl.currentPage = roundf(pageFraction);
}

Answer 1

ImageView 的框架需要与其父 View (即 View )相关，而不是 ScrollView 。要实现你想要的分页改变:

    UIImageView *imageView = [[UIImageView alloc] initWithFrame:view.frame];

到:

    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0.0, 0.0, view.frame.size.width, view.frame.size.height)];