AFNetworking 3.0无法下载图像
我试图使用AFNetworking 3.0以这种方式下载图像：
- (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; } 每次我收到此错误：
***断言失败 – [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？
如果使用AFNetworking 3.0，则需要添加头文件AFImageDownloader.h ：
#import
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"); }];
伙计们，我很抱歉花时间。 我注意到链接数组中的几个元素是空的，在添加了检查条件后我遇到了与答案内容类型相关的另一个问题：
“不可接受的内容类型：text / plain”
和
“Error Domain = NSCocoaErrorDomain Code = 3840”无法使用AFNetworking完成操作“
在我尝试了几个变种之后：
manager.responseSerializer = [AFImageResponseSerializer serializer]; manager.responseSerializer = [AFJSONResponseSerializer serializerWithReadingOptions:NSJSONReadingAllowFragments]; manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"];
“ manager.responseSerializer = [AFHTTPResponseSerializer serializer]; ”是正确的。 还要记住，您正在使用异步进程和管理器在函数返回值后获得答案。 谢谢你们！
您可以使用 ：
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration]; AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration]; NSURL *URL = [NSURL URLWithString:@"http://example.com"]; NSURLRequest *request = [NSURLRequest requestWithURL:URL]; NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) { NSURL *documentsDirectoryURL = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:NO error:nil]; return [documentsDirectoryURL URLByAppendingPathComponent:[response suggestedFilename]]; } completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) { NSLog(@"File downloaded to: %@", filePath); }]; [downloadTask resume];
图像下载已经过重构，以便在AFNetworking 3.0中使用新的AFImageDownloader类来跟踪AlamofireImage的架构。
您可以使用AFNetworking的直接方法下载图像
NSURLRequest *request = [[NSURLRequest alloc]initWithURL:[NSURL URLWithString:"YOUR URL OF IMAGE HERE"]; ["YOUR IMAGEVIEW" setImageWithURLRequest:request placeholderImage:"YOUR PLACEHOLDER IMAGE" success:^(NSURLRequest * _Nonnull request, NSHTTPURLResponse * _Nullable response, UIImage * _Nonnull image) { "YOUR IMAGEVIEW".image = image; } failure:^(NSURLRequest * _Nonnull request, NSHTTPURLResponse * _Nullable response, NSError * _Nonnull error) { NSLog(@"%@",error); }];
希望这件事有所帮助
使用URLFragmentAllowedCharacterSet而不是URLHostAllowedCharacterSet