iOS:For-circle要使用`AFHTTPSessionManager`上传多张照片，返回returnUrl以拼接到字符串

#import <AFNetworking/AFHTTPSessionManager.h>

AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
manager.requestSerializer = [AFHTTPRequestSerializer serializer];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];

NSDictionary *parameters = @{@"key1": @"value1", @"key2": @"value2"};

[manager POST:@"http://example.com/upload" parameters:parameters constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
    for (UIImage *image in images) {
        NSData *imageData = UIImageJPEGRepresentation(image, 0.5);
        [formData appendPartWithFileData:imageData name:@"file" fileName:@"image.jpg" mimeType:@"image/jpeg"];
    }
} progress:nil success:^(NSURLSessionDataTask *task, id responseObject) {
    // 上传成功，可以在这里处理返回的数据
    NSDictionary *responseDict = [NSJSONSerialization JSONObjectWithData:responseObject options:kNilOptions error:nil];
    NSString *returnUrl = responseDict[@"returnUrl"];
    // 将returnUrl拼接到字符串中
    NSString *resultString = [NSString stringWithFormat:@"http://example.com/%@", returnUrl];
    NSLog(@"Result: %@", resultString);
} failure:^(NSURLSessionDataTask *task, NSError *error) {
    // 上传失败，可以在这里处理错误信息
    NSLog(@"Error: %@", error);
}];