標籤：ios
ios後台更新和下載by 伍雪穎
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
[application setMinimumBackgroundFetchInterval:UIApplicationBackgroundFetchIntervalMinimum];
NSLog(@"Launched in background %d",UIApplicationStateBackground == application.applicationState);
returnYES;
}
// 1.利用Background Fetch
- (void)application:(UIApplication *)application performFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler {
NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfigurationdefaultSessionConfiguration];
NSURLSession *session = [NSURLSessionsessionWithConfiguration:sessionConfiguration];
NSURL *url = [[NSURLalloc]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
/*
推送的內容
{
"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 = [NSStringstringWithFormat:@"http://yourserver.com/downloads/%d.mp3", [contentID intValue]];
NSURL* downloadURL = [NSURLURLWithString:downloadURLString];
NSURLRequest *request = [NSURLRequestrequestWithURL:downloadURL];
NSURLSessionDownloadTask *task = [[selfbackgroundURLSession]downloadTaskWithRequest:request];
task.taskDescription = [NSStringstringWithFormat:@"Podcast Episode %d", [contentID intValue]];
[task resume];
completionHandler(UIBackgroundFetchResultNewData);
}
- (NSURLSession *)backgroundURLSession
{
staticNSURLSession *session =nil;
staticdispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
NSString *identifier =@"io.objc.backgroundTransferExample";
NSURLSessionConfiguration* sessionConfig = [NSURLSessionConfigurationbackgroundSessionConfiguration:identifier];
session = [NSURLSessionsessionWithConfiguration:sessionConfig
delegate:self
delegateQueue:[NSOperationQueuemainQueue]];
});
return session;}
ios後台更新和下載
