在我的 iPhone 定时器应用程序中，
其中计时器应在后台运行。
所以，
我已经在 appdelegate 中设置了通知，它工作得很好......
这样我就可以从视图控制器调用方法，这使得计时器处于活动状态。
看一些代码...
应用程序委托
- (void)applicationDidEnterBackground:(UIApplication *)application
{
/*
Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
*/
NSLog(@"Time Remaining %d",(self.viewController.totalSeconds-self.viewController.totalCount));
[self.viewController selectandnotify:(self.viewController.totalSeconds-self.viewController.totalCount)];
[self.viewController stopTimer];
[self.viewController startTimerAction];
}
这里我调用方法启动定时器动作方法在我的视图控制器中...看看这个...
-(void)startTimerAction
{
timer_main = [NSTimer scheduledTimerWithTimeInterval:(1.0) target:self selector:@selector(ShowActicity) userInfo:nil repeats:YES];
}
NSTimer 是哪个
每次都在这里
-显示活动方法将在每秒后调用...这在我的视图控制器中如下...
-(void)ShowActicity
{
NSLog(@"Total Counts %d",totalCount);
if (totalCount == totalSeconds) {
if ([timer_main isValid]) {
[timer_main invalidate];
isTimeOver = YES;
[self generateLog];
}
} else {
totalCount++;
seconds =seconds + 1;
if(seconds > 59)
{
minutes = minutes + 1;
seconds= 0;
}
}
如何每次从视图控制器调用这个方法......
我认为如果我委托是一个不错的选择吗？
任何其他方式......请有一些建议
一般使用此代码进行后台运行。在后台计时器不起作用
- (void)applicationDidEnterBackground:(UIApplication *)application
{
UIApplication* app = [UIApplication sharedApplication];
bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
[app endBackgroundTask:bgTask];
bgTask = UIBackgroundTaskInvalid;
}];
// Start the long-running task and return immediately.
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// Do the work associated with the task.
[self startTimerAction];
[app endBackgroundTask:bgTask];
bgTask = UIBackgroundTaskInvalid;
});
}
http://developer.apple.com/library/ios/#DOCUMENTATION/iPhone/Conceptual/iPhoneOSProgrammingGuide/ManagingYourApplicationsFlow/ManagingYourApplicationsFlow.html#//apple_ref/doc/uid/TP40007072-CH4-SW3
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