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| 关键词： nbsp CompletionHandle application UIBackgroundFetc NSURLSession NSURLSessionConf session iguration userInfo NSString |
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { [application setMinimumBackgroundFetchInterval:UIApplicationBackgroundFetchIntervalMinimum]; NSLog(@"Launched in background %d",UIApplicationStateBackground == application.applicationState); return YES; } // 1.利用Background Fetch - (void)application:(UIApplication *)application performFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler { NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration]; NSURLSession *session = [NSURLSession sessionWithConfiguration:sessionConfiguration]; NSURL *url = [[NSURL alloc] initWithString:@"http://127.0.0.1/data.json"]; NSURLSessionDataTask *task = [session dataTaskWithURL:url completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { if (error) { completionHandler(UIBackgroundFetchResultFailed); return; } completionHandler(UIBackgroundFetchResultNewData); }]; [task resume]; } // 2.利用Remote Notification /* 推送的内容 { "aps" : { "content-available" : 1 }, "content-id" : 42 } */ - (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler { NSLog(@"Received remote notification with userInfo %@", userInfo); NSNumber *contentID = userInfo[@"content-id"]; NSString *downloadURLString = [NSString stringWithFormat:@"http://yourserver.com/downloads/%d.mp3", [contentID intValue]]; NSURL* downloadURL = [NSURL URLWithString:downloadURLString]; NSURLRequest *request = [NSURLRequest requestWithURL:downloadURL]; NSURLSessionDownloadTask *task = [[self backgroundURLSession] downloadTaskWithRequest:request]; task.taskDescription = [NSString stringWithFormat:@"Podcast Episode %d", [contentID intValue]]; [task resume]; completionHandler(UIBackgroundFetchResultNewData); } - (NSURLSession *)backgroundURLSession { static NSURLSession *session = nil; static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ NSString *identifier = @"io.objc.backgroundTransferExample"; NSURLSessionConfiguration* sessionConfig = [NSURLSessionConfiguration backgroundSessionConfiguration:identifier]; session = [NSURLSession sessionWithConfiguration:sessionConfig delegate:self delegateQueue:[NSOperationQueue mainQueue]]; }); return session; } |
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