Question

我正在使用setImageWithURLRequest:placeholderImage:success:failure从网址下载图片，并且图片下载正常。我遇到的问题是，当我将下载的图像设置为UIIMageView时，没有显示任何内容，但删除了占位符。

我的代码如下：

__weak UIImageView *userCardImageView;


AFImageResponseSerializer *serializer = [[AFImageResponseSerializer alloc] init];
serializer.acceptableContentTypes = [serializer.acceptableContentTypes setByAddingObject:@"image/png"];
self.userCardImageView.imageResponseSerializer = serializer;

[self.userCardImageView setImageWithURLRequest:urlRequest placeholderImage:nil success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {

        [userCardImageView setImage:image];

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

        if (error)
        {
            NSLog(@"Error:   %@", error);
            NSLog(@"Error response:     %@", response);
        }

    }];

网址是正确的，因为当我将其复制并浏览到浏览器中时，我会得到我的图片。

有人可以告诉我如何让我的代码更新URL吗？我是否有权将UIImageView分配给弱势财产？我这样做是因为使用self或强变量可能会导致保留周期。

Answer 1

您似乎应该实现

行

[userCardImageView setImage:image];

而不是

[userCardImageView setImage:[UIImage imageWithData:userCardImageData]];

在您的成功栏中

PS：如果你要设置图像的是self.userCardImageView，你宁愿声明一个弱控制器而不是弱UIImageView引用。像

这样的东西

__weak __typeof(&*self)weakSelf = self

Answer 2

实际上您没有正确地将下载的图像分配到图像视图。[userCardImageView setImage:[UIImage imageWithData:userCardImageData]];，我们无需分配此变量userCardImageData中的图像，请尝试此代码

[self.userCardImageView setImageWithURLRequest:urlRequest placeholderImage:nil success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
    dispatch_async(dispatch_get_main_queue(), ^{
        [userCardImageView setImage:image]; //set image in main thread , we got downloaded image as parameter in block
    });


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

    if (error)
    {
        NSLog(@"Error:   %@", error);
        NSLog(@"Error response:     %@", response);
    }

}];

希望这有帮助

Answer 3

应该足够了：

[self.userCardImageView setImageWithURL:url];

AFNetworking setImageWithURLRequest不更新UIImageView

3 个答案: