CODEWITHSUNDEEP
objective-cxcode
Prashant
Prashant

Reputation: 2192

NSTimer with CFRunLoop

I am having a strange issue. My NSTimer CallMe method does not get fired without CFRunLoop. And if I add CFRunLoop then the line after CFRunLoop never gets called. I want both the line after CFRunLoop and CallMe method to get fired.

EDIT - I dont care about CFRunLoop just want the the timer to fire every 20 secs.

I have added the code and the comments below

int main(int argc, char * const argv[]) {
Updater *theUpdater = [[Updater alloc] init];
NSTimer *theTimer = [theUpdater getTimer];
[theTimer retain];
//CFRunLoopRun();
 NSLog(@"I am here"); //If I uncomment CFRUnLoop this line does not get executed
}

@implementation Updater

- (NSTimer *)getTimer {
NSLog(@"Timer started");
NSTimer *theTimer;
theTimer = [NSTimer scheduledTimerWithTimeInterval:20.0
                                                target:self 
                                      selector:@selector(CallMe:) 
                                         userInfo:nil 
                                         repeats:YES];

return theTimer;

}

-(void) CallMe:(NSTimer*)theTimer{
NSLog(@"I Never get called");
}

@end

Upvotes: 2

Views: 1194

Answers (2)

Perception
Perception

Reputation: 80603

Your timer needs to be created in the context of your CFRunLoop. So your code should look more like this:

NSRunLoop* myRunLoop = [NSRunLoop currentRunLoop];

Updater * theUpdater = [[Updater alloc] init];

[myRunLoop run]

You should have the Updater object retain your timer, since it is its owner. Note that when you invoke the run function that it will never terminate. For other options consult the NSRunLoop documentation.

Upvotes: 1

omz
omz

Reputation: 53551

This is the expected behavior. From the CFRunLoop docs (emphasis added):

CFRunLoopRun

Runs the current thread’s CFRunLoop object in its default mode indefinitely.

In other words, CFRunLoopRun() never returns, unless you call CFRunLoopStop() somewhere.

Upvotes: 1

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