AF上传图片

+ (void)uploadImageWithUrl:(NSString *)url
image:(UIImage *)image
success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure
{

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
[manager POST:url parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
NSData *imageData = UIImageJPEGRepresentation(image, 0.5);

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = @"yyyyMMddHHmmss";
NSString *str = [formatter stringFromDate:[NSDate date]];
NSString *fileName = [NSString stringWithFormat:@"%@.jpg", str];

// 上传图片，以文件流的格式
[formData appendPartWithFileData:imageData name:@"myfiles" fileName:fileName mimeType:@"image/jpeg"];

} success:^(AFHTTPRequestOperation *operation, id responseObject) {
success(operation,responseObject);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
failure(operation,error);
}];

}