ScrollView Image -Page控制iOS

Question

在下面的实现中，图像是从数据库中获取的，一旦我放置一个调试点并查看webservice返回的图像数量，它就会显示五个。但是，在我的滚动视图中，只显示三个图像。

-(void) setSizeSliding
{
    for (int i = 0; i < colors.count; i++) {
        CGRect frame;
        frame.origin.x = self.scrollView.frame.size.width * i;
        frame.origin.y = 0;
        frame.size = self.scrollView.frame.size;

        NSString*slidingImage = [[colors objectAtIndex:i] valueForKey:@"picture"];
        NSURL *url = [NSURL URLWithString:slidingImage];
        NSData *data = [[NSData alloc] initWithContentsOfURL:url];
        UIImage *tmpImage = [[UIImage alloc] initWithData:data];

        UIImageView *slidingImageView = [[UIImageView alloc]initWithFrame:frame];
        slidingImageView.image = tmpImage;
        [self.scrollView addSubview:slidingImageView];
    }

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


}

更新

如果我更改页面控制页面属性，那么我可以向上滚动到所有五个图像。但是，我怎么能避免使用const值？

Answer 1

以下是解决方案，一旦我将self.pageControl.numberOfPages添加到我的代码中，就可以了。

 -(void) setSizeSliding
    {
        for (int i = 0; i < colors.count; i++) {
            CGRect frame;
            frame.origin.x = self.scrollView.frame.size.width * i;
            frame.origin.y = 0;
            frame.size = self.scrollView.frame.size;

            NSString*slidingImage = [[colors objectAtIndex:i] valueForKey:@"picture"];
            NSURL *url = [NSURL URLWithString:slidingImage];
            NSData *data = [[NSData alloc] initWithContentsOfURL:url];
            UIImage *tmpImage = [[UIImage alloc] initWithData:data];

            UIImageView *slidingImageView = [[UIImageView alloc]initWithFrame:frame];
            slidingImageView.image = tmpImage;
            [self.scrollView addSubview:slidingImageView];
        }

        self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * colors.count, self.scrollView.frame.size.height);
   //solution    
   // the following code needs to be added to handle number of pages
    self.pageControl.numberOfPages = colors.count;


    }