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iosobjective-ctouch

Count the seconds for long holding touch

I'm trying to count the seconds for holding a tap on the screen or a specific view object.

There are some touch events like touchDownInside, touchUpInside, touchesBegan, and many more, but what method can perform holding touch?

Solution

  • Create the following two methods and add the property. Comment the button "Touch Down" event to the touchDown: method and the "Touch Up Inside" event to the touchUp: method.

    @property (strong, nonatomic) NSDate *touchDownTime;

- (IBAction)touchDown:(id)sender {
    self.touchDownTime = [NSDate date];
}

- (IBAction)touchUp:(id)sender {
    NSTimeInterval timeDown = [self.touchDownTime timeIntervalSinceNow];
    NSLog(@"'timeDown: %0.1f sec", timeDown);
}

    If you need to do something every second (or some interval) start a timer in touchDown and invalidate in touchUp.