iOS推送增加右侧显示图Service Extension

#import "NotificationService.h"
#import "JPushNotificationExtensionService.h"
@interface NotificationService ()
@property (nonatomic, strong) void (^contentHandler)(UNNotificationContent *contentToDeliver);
@property (nonatomic, strong) UNMutableNotificationContent *bestAttemptContent;
@end
@implementation NotificationService
- (void)didReceiveNotificationRequest:(UNNotificationRequest *)request withContentHandler:(void (^)(UNNotificationContent * _Nonnull))contentHandler {
    self.contentHandler = contentHandler;
    self.bestAttemptContent = [request.content mutableCopy];
    // 读取图片地址，并加载
    NSString *imgUrl = [NSString stringWithFormat:@"%@", self.bestAttemptContent.userInfo[@"imageUrl"]]; // ??图片字段的key值需要跟后台开发统一
    if (imgUrl) {
        NSURL *fileURL = [NSURL URLWithString:imgUrl];
        [self downloadAndSave:fileURL handler:^(NSString *localPath) {
            if (localPath) {
                UNNotificationAttachment * attachment = [UNNotificationAttachment attachmentWithIdentifier:@"myAttachment" URL:[NSURL fileURLWithPath:localPath] options:nil error:nil];
                self.bestAttemptContent.attachments = @[attachment];
            }
            [self apnsDeliverWith:request];
        }];
    } else {
        [self apnsDeliverWith:request];
    }
}
- (void)serviceExtensionTimeWillExpire {
    self.contentHandler(self.bestAttemptContent);
}
#pragma mark - 私有方法
- (void)downloadAndSave:(NSURL *)fileURL handler:(void (^)(NSString *))handler {
    // 这里需要用系统网络请求来下载图片
    NSURLSession *session = [NSURLSession sharedSession];
    NSURLSessionDownloadTask *task = [session downloadTaskWithURL:fileURL completionHandler:^(NSURL * _Nullable location, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        NSString *localPath = nil;
        if (!error) {
            // 临时文件夹路径，APP没有运行时会自动清除图片，不会占用内存
            NSString *localURL = [NSString stringWithFormat:@"%@/%@", NSTemporaryDirectory(), fileURL.lastPathComponent];
            if ([[NSFileManager defaultManager] moveItemAtPath:location.path toPath:localURL error:nil]) {
                localPath = localURL;
            }
        }
        handler(localPath);
    }];
    [task resume];
}
- (void)apnsDeliverWith:(UNNotificationRequest *)request {
    [JPushNotificationExtensionService jpushSetAppkey:@"本应用在极光平台的AppKey"];
    [JPushNotificationExtensionService jpushReceiveNotificationRequest:request with:^ {
        NSLog(@"apns upload success");
        self.contentHandler(self.bestAttemptContent);
    }];
}
@end