NSTimer ScheduledTimerWithTimeInterval：target：selector：userInfo：repeats不调用该方法

Question

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

Answer 1

It was a thread issue. I've fixed with:

dispatch_async(dispatch_get_main_queue(), ^{
    // Timer here
});

Answer 2

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), dispatch_get_main_queue(), ^(void){
    // Your code
  });

where 2.0 is an amount of seconds that will pass before the block will get executed

Answer 3

Just use this

[NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(hideManual) userInfo:nil repeats:NO];

EDIT

This code work well when btn (an UIButton ) pressed and -(void)btnPressed function called.

-(void)btnPressed{
    [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(hideManual) userInfo:nil repeats:NO];
}

-(void)hideManual{
    NSLog(@"Hi, I'm here!");
}

Answer 4

try this :

NSTimer *manualOverlayTimer = [NSTimer scheduledTimerWithTimeInterval:1.0
                              target:self
                              selector:@selector(hideManual)
                              userInfo:nil
                              repeats:YES];

repeat:YES instead of [[NSRunLoop currentRunLoop] addTimer:manualOverlayTimer forMode:NSDefaultRunLoopMode];

Answer 5

in your code fragments it does not show when and where the NSTimer is fired.

if you want to use the NSTimer , you should fire the timer after the init, like this:

NSTimer *_timer = [NSTimer scheduledTimerWithTimeInterval:2.f target:self selector:@selector(hideManual) userInfo:nil repeats:false];
[_timer fire];

but you can use the following line in your any method as well:

[self performSelector:@selector(hideManual) withObject:nil afterDelay:2.f];

it looks easier in this case than working with NSTimer .