網(wǎng)上看到一篇iOS程序進(jìn)入后臺仍可運行定時器的方法,在此做一個記錄 原文,也許以后可以用到
1.在Info.plist中伯病，添加"Required background modes"鍵纲爸，value為：App plays audio
2.在AppDelegate 的 application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions中添加代碼
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease]; // Override point for customization after application launch.
NSError *setCategoryErr = nil;
NSError *activationErr = nil;
[[AVAudioSession sharedInstance]
setCategory: AVAudioSessionCategoryPlayback
error: &setCategoryErr];
[[AVAudioSession sharedInstance]
setActive: YES
error: &activationErr];
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible]; return YES;
}
3在AppDelegate進(jìn)入后臺的方法applicationDidEnterBackground:(UIApplication *)application添加代碼
- (void)applicationDidEnterBackground:(UIApplication *)application{
UIApplication* app = [UIApplication sharedApplication];
__block UIBackgroundTaskIdentifier bgTask;
bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
dispatch_async(dispatch_get_main_queue(), ^{
if (bgTask != UIBackgroundTaskInvalid) {
bgTask = UIBackgroundTaskInvalid;
}
});
}];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
dispatch_async(dispatch_get_main_queue(), ^{
if (bgTask != UIBackgroundTaskInvalid) {
bgTask = UIBackgroundTaskInvalid;
}
});
});
}
