AFNetworking 2.0 setImageWithURLRequest

Question

我在我当前的一个项目中下载图像时使用此代码，但它不能与AFNetworking 2.0一起使用。我试过通过AFImageResponseSerializer，但我找不到合适的代码。

[cell.posterImage setImageWithURLRequest:urlRequest placeholderImage:[UIImage imageNamed:@"placeholder.png"] success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
            cell.posterImage.image = image;
        } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
            NSLog(@"Request failed with error: %@", error);
        }];

有关AFNetworking 2.0中使用的新代码的任何建议吗？谢谢！

Answer 1

我使用此代码使其工作：

AFHTTPRequestOperation *posterOperation = [[AFHTTPRequestOperation alloc] initWithRequest:urlRequest];
posterOperation.responseSerializer = [AFImageResponseSerializer serializer];
[posterOperation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
    NSLog(@"Response: %@", responseObject);
    _posterImageView.image = responseObject;

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Image request failed with error: %@", error);
}];
[[NSOperationQueue mainQueue] addOperation:posterOperation];
[posterOperation start];

但是我使用它来解决占位符图像的另一个问题。有什么想法吗？

Answer 2

您正在寻找UIImageView (AFNetworking) category。

#import "UIImageView+AFNetworking.h"

//...
[cell.posterImage setImageWithURLRequest:urlRequest placeholderImage:[UIImage imageNamed:@"placeholder.png"] success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
        cell.posterImage.image = image;
    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
        NSLog(@"Request failed with error: %@", error);
    }];

cell.posterImage必须是UIImageView，而不是UIImage。

Answer 3

使用更新的AFNetworking 2.0（如果您的文件仅供下载使用，则无法通过简单的网址访问）：

NSString * methodURL = @"http://www.yourserver.com/pathToImageDownloadMethod";
NSInteger someIDYouHaveOfAnImage = 13;
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.responseSerializer = [AFImageResponseSerializer serializer];
NSDictionary * parameterDictionary = @{@"Parameter" : [NSNumber numberWithInteger:someIDYouHaveOfAnImage]};
[manager GET:methodURL parameters:parameterDictionary success:^(AFHTTPRequestOperation *operation, id responseObject) {
    if ([responseObject isKindOfClass:[UIImage class]]) {
        UIImage * image = responseObject;
        // Here is your image object
    }
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"failure getting the file : %@", error.localizedDescription);
}];

希望它有所帮助。

Answer 4

https://github.com/AFNetworking/AFNetworking/archive/master.zip包含UIKit + AFNetworking目录