AFNetworking 3.0无法下载图像 [英] AFNetworking 3.0 can't download image

问题描述

我正在尝试使用AFNetworking 3.0以这种方式下载图像：

I am trying to download an image using AFNetworking 3.0 doing this way:

- (UIImage *) loadImage:(NSString *) link
 {
    __block UIImage *image = [UIImage imageNamed:@"no_user_profile_pic.png"];
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    manager.responseSerializer = [AFImageResponseSerializer serializer];
    [manager GET:[link stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLHostAllowedCharacterSet]]
      parameters:nil
        progress:nil
         success:^(NSURLSessionTask *task, id responseObject) {
             image = (UIImage *) responseObject;
         } failure:^(NSURLSessionTask *operation, NSError *error) {
             NSLog(@"Load Image error - %@", [error description]);
         }];
    return image;
}

以及每次收到此错误时：

and every time I am getting this error:

***断言失败 - [AFHTTPRequestSerializer requestWithMethod：URLString：parameters：error：]，/ Users /.../AFNetworking/AFURLRequestSerialization.m:353

*** Assertion failure in -[AFHTTPRequestSerializer requestWithMethod:URLString:parameters:error:], /Users/.../AFNetworking/AFURLRequestSerialization.m:353

我无法弄清楚我做错了什么。发生了什么错误？

I can't figure out what I am doing wrong. What is that error happening?

推荐答案

如果使用AFNetworking 3.0，则需要添加头文件 AFImageDownloader.h ：

If you use AFNetworking 3.0 you need add the header file AFImageDownloader.h:

#import <AFNetworking/AFImageDownloader.h>

并使用方法 downloadImageForURLRequest ：

NSString* stringVideo = [NSString stringWithFormat:@"https:%@", your link];
AFImageDownloader* dow = [[AFImageDownloader alloc] init];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString: stringVideo]];
[dow downloadImageForURLRequest:request success:^(NSURLRequest * _Nonnull request, NSHTTPURLResponse * _Nullable response, UIImage * _Nonnull responseObject) {
    NSLog(@"Succes downloud image");
} failure:^(NSURLRequest * _Nonnull request, NSHTTPURLResponse * _Nullable response, NSError * _Nonnull error) {
    NSLog(@"Error downloud image");
}];

这篇关于AFNetworking 3.0无法下载图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！