CODEWITHSUNDEEP
iphoneobjective-c
Siddiqui
Siddiqui

Reputation: 7840

Time between touch began and touch ended

Is there any method in objective-c to find the time between touch began and touch ended??

Upvotes: 3

Views: 3964

Answers (3)

willc2
willc2

Reputation: 39691

// add this ivar to your view controller
NSTimeInterval lastTouch;

 // assign the time interval in touchesBegan:
 -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
 {
     lastTouch = [event timestamp];
 }  


 // calculate and print interval in touchesEnded:
 -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event;
{
    NSTimeInterval touchBeginEndInterval = [event timestamp] - lastTouch;

    NSLog(@"touchBeginEndInterval %f", touchBeginEndInterval);
}

Upvotes: 18

Meltemi
Meltemi

Reputation: 38359

Each UITouch has it's own time/date stamp. Compare the ones you're interested in. Take a looke at the UIResponder class ref.

Aside- SO needs to update their code or release an iPhone app. Typing into their javascriptoided out text fields with an iPhone is almost comical.

Upvotes: 2

Peter Hosey
Peter Hosey

Reputation: 96373

In your touchesBegan:withEvent: method, create an NSDate object and store it in an instance variable. (For non-debugging purposes, create one date per touch and use CFMutableDictionary to associate the date with the touch.) Then, in touchesEnded:withEvent:, retrieve the stored date and create a new date, and send the latter a timeIntervalSinceDate: message to subtract the older date from it, giving you the result in seconds.

Upvotes: 0

Related Questions