Question

这是来自UIImageView+AFNetworking库。

    AFImageRequestOperation *requestOperation = [[AFImageRequestOperation alloc] initWithRequest:urlRequest];
    [requestOperation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
        if ([[urlRequest URL] isEqual:[[self.af_imageRequestOperation request] URL]]) {
            if (success) {
                success(operation.request, operation.response, responseObject);
            } else {
                self.image = responseObject;
                [self setNeedsLayout];
                [self setNeedsDisplay];
            }

            self.af_imageRequestOperation = nil;
        }

我添加了setNeedsLayout和setNeedsDisplay。在这种情况下，imageview（UITableViewCell的imageView仍然具有0,0,0,0帧。单击单元格将刷新图像视图，否则图像不会显示。

如何强制UIImageView调整大小？

我试过放入

 self.image = responseObject;
                    self.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y,
                                                 self.image.size.width, self.image.size.height);
                    [self setNeedsDisplay];
                    [self setNeedsLayout];

基于

How to make UIImageView automatically resize to the size of the image loaded

设置框架的解决方案。我可以在那里注销一个更大的框架，但它不会出现在屏幕上。

Answer 1

在没有看到其余代码的情况下很难分辨，但我相信问题可能出在请求操作的完成处理程序中：

        if (success) {
            success(operation.request, operation.response, responseObject);
        } else {
            self.image = responseObject;
            [self setNeedsLayout];
            [self setNeedsDisplay];
        }

您似乎只在请求失败时设置图像。将其移至成功块可能会解决问题。

        if (success) {
            success(operation.request, operation.response, responseObject);
            self.image = responseObject;
            [self setNeedsLayout];
            [self setNeedsDisplay];
        }

您是否有特殊原因没有使用AFNetworking / UIImageView + AFNetworking.h方法？似乎它们适合您的用例。

- (void)setImageWithURL:(NSURL *)url
       placeholderImage:(nullable UIImage *)placeholderImage;  

- (void)setImageWithURLRequest:(NSURLRequest *)urlRequest
          placeholderImage:(nullable UIImage *)placeholderImage
                   success:(nullable void (^)(NSURLRequest *request, NSHTTPURLResponse * _Nullable response, UIImage *image))success
                   failure:(nullable void (^)(NSURLRequest *request, NSHTTPURLResponse * _Nullable response, NSError *error))failure;

AFNetworking使用URL设置UITableViewCell的imageView图像，设置图像后imageview帧仍为0

1 个答案: