nstimer

-(void)viewDidLoad{ dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ [NSTimer scheduledTimerWithTimeInterval:0.10 target:self selector:@selector(action_Timer) userInfo:nil repeats:YES]; } ); } -(void)action_Timer{ LOG("Timer called"); } action_Timer is not being called. I dont know why. Do you have any idea? You're calling +[NSTimer scheduledTimerWithTimeInterval:...] from a GCD worker thread. GCD worker threads don't run a run loop. That's why your first try didn't work. When you tried [[NSRunLoop mainRunLoop] addTimer:myTimer forMode:NSDefaultRunLoopMode] ,

I'm trying to build an alarm app that can fire an alarm while in locked-screen mode (the app is in the foreground, but the screen is locked). The alarm has to be triggered by a NSTimer not by uilocalnotification. In iOS 4 I used the 'play silent sound every 10 seconds' hack to prevent the app from going to deep sleep and the timer events worked fine. However, in iOS 5 this doesn't seem to work. Any ideas? Or this should work and I'm doing something wrong? It seems that you actually can use the 'play silent audio' hack in iOS 5, but the audio has to be audible meaning you can't play it at

I'm looking to create a countdown timer for SMPTE Timecode (HH:MM:SS:FF) on iOS. Basically, it's just a countdown timer with a resolution of 33.33333ms. I'm not so sure NSTimer is accurate enough to be counted on to fire events to create this timer. I would like to fire an event or call a piece of code every time this timer increments/decrements. I'm new to Objective-C so I'm looking for wisdom from the community. Someone has suggested the CADisplayLink class, looking for some expert advice. Try CADisplayLink. It fires at the refresh rate (60 fps). CADisplayLink *displayLink = [CADisplayLink

I am developing a QuiZ app. It needs a countdown timer, In that I want to start a timer at 75:00.00 (mm:ss.SS) and decrease it to 00:00.00 (mm:ss.SS) by reducing 1 millisecond. I want to display an alert that Time UP! when time reaches to 00:00.00 (mm:ss.SS). I am displaying the time by following below link Stopwatch using NSTimer incorrectly includes paused time in display Here is a simple solutions to your problem. Declarations @interface ViewController : UIViewController { IBOutlet UILabel * result; NSTimer * timer; int currentTime; } - (void)populateLabelwithTime:(int)milliseconds; -

The timer never invokes the method. What am I doing wrong ? This is the code: NSTimer *manualOverlayTimer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(hideManual) userInfo:nil repeats:NO]; method: -(void)hideManual thanks aneuryzm It was a thread issue. I've fixed with: dispatch_async(dispatch_get_main_queue(), ^{ // Timer here }); You don't need an NSTimer for a task of this sort. To hide your view object after a specific period of time on main thread you can use a gcd method dispatch_after dispatch_after(dispatch_time(DISPATCH_TIME_NOW, NSEC_PER_SEC * 2.0),

i am doing function call with scheduledTimerWithTimeInterval. i am just checking that xml parsing is completed or not for particular web services and invalidating timer in didEndElement method after getting successful response. timerForStopWebService = [NSTimer scheduledTimerWithTimeInterval:30.0 target:self selector:@selector(stopWS) userInfo:nil repeats:NO]; now i am facing problem with iOS 5.0 and its working fine in other iOS versions. in iOS 5.0, a function stopWS call anytime even if i am invalidating it. let me know if you have solution for that. and now i am implementing