1

我有一个 UIScrollView，我想从 flickr 加载图像列表。然后，我希望照片的显示方式与您滚动浏览照片的原生库存 iphone 照片应用程序一样。

这是我的代码

- (void)viewDidLoad
{
    [super viewDidLoad];

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

        UIView *subview = [[UIView alloc] initWithFrame:frame];


        [self returnImageFromFlickr:[self.urlArray objectAtIndex:i]];

        UIImageView *imageView = self.largePhoto;

        [subview addSubview:imageView];
        [self.scrollView addSubview:subview];

    }

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

-(void)returnImageFromFlickr:(NSURL *)url {



    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
    [self.largePhoto setImageWithURLRequest:request placeholderImage:[UIImage imageNamed:@"placeholder.png"] success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {



        [self.largePhoto setImageWithURL:url placeholderImage:[UIImage imageNamed:@"placeholder.png"]];

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {

    }];

}

正在发生的事情只显示最后一张图像。

我按照我的理解尝试了您的解决方案并得到了这个。这不是在拍照片。只是一个白屏。加上 returnImageFromFlicrk 方法中的警告

[imageView setImageWithURL:url placeholderImage:[UIImage imageNamed:@"placeholder.png"]];

说在此块中强烈捕获“imageView”可能会导致保留周期

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.

   /*for (int i = 0; i < self.urlArray.count; i++) {
        CGRect frame;
        frame.origin.x = self.scrollView.frame.size.width * i;
        frame.origin.y = 0;
        frame.size = self.scrollView.frame.size;

        UIView *subview = [[UIView alloc] initWithFrame:frame];


        [self returnImageFromFlickr:[self.urlArray objectAtIndex:i]];

        UIImageView *imageView = self.largePhoto;

        [subview addSubview:imageView];
        //subview.backgroundColor = [colors objectAtIndex:i];
        [self.scrollView addSubview:subview];

    }*/

    for (int i = 0; i < self.urlArray.count; i++) {
        CGRect frame;
        frame.origin.x = self.scrollView.frame.size.width * i;
        frame.origin.y = 0;
        frame.size = self.scrollView.frame.size;
        UIImageView *imageView = [[UIImageView alloc] init];
        [self returnImageFromFlickr:[self.urlArray objectAtIndex:i] imageview:imageView];

        [self.scrollView addSubview:imageView];

    }

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

-(void)returnImageFromFlickr:(NSURL *)url imageview:(UIImageView *)imageView {
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
    [imageView setImageWithURLRequest:request placeholderImage:[UIImage imageNamed:@"placeholder.png"] success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
        [imageView setImageWithURL:url placeholderImage:[UIImage imageNamed:@"placeholder.png"]];

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {

    }];


}
4

3 回答 3

0

您没有为 Scroll 内容 pan 设置正确的参数，这就是为什么您想要的所有图像都没有显示在 scrollView 中的原因。尝试更新 ScrollView 的内容平移以适应所有图像的宽度。像

self.scrollView.contentSize = CGSizeMake（宽度，高度）；

在这种情况下，高度将是单个图像的高度，宽度将是（单个图像的宽度 * 图像总数）

于 2013-02-27T12:20:49.247 回答
0

你覆盖 self.largePhoto，你需要在 returnImageFromFlickr 中设置你的 imageView

试试这个

UIImageView *imageView = [[UIImageView alloc] init];
[self returnImageFromFlickr:[self.urlArray objectAtIndex:i] imageview:imageView];

和

-(void)returnImageFromFlickr:(NSURL *)url imageview:(UIImageView *)imageView {
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
    [imageView setImageWithURLRequest:request placeholderImage:[UIImage imageNamed:@"placeholder.png"] success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
        [imageView setImage:image];

} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {

}];

}

于 2013-02-27T12:26:46.780 回答
0

我需要做的就是将代码从 viewDidLoad 移动到 viewDidApear

于 2013-02-28T09:58:50.337 回答