CODEWITHSUNDEEP
xcodeeventsselectornstimertouches
majorl3oat
majorl3oat

Reputation: 1

how can I pass event through @selector in NSTimer

//I need to send event trough @selector([move:event]) thanks in advance.

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    moveTimer = [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(move:) userInfo:nil repeats:YES];
}

//my move function

- (void)move:(UIEvent *)event { 
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint location = [touch locationInView:touch.view];
    if (location.x > myImageView.center.x){
        [UIView animateWithDuration:0.001 animations:^{
            myImageView.center = CGPointMake(myImageView.center.x+5, myImageView.center.y); 
        }];
    }
    else if (location.x < myImageView.center.x){
        [UIView animateWithDuration:0.001 animations:^{
            myImageView.center = CGPointMake(myImageView.center.x-5, myImageView.center.y); 
        }];
    }
    if (location.y < myImageView.center.y){
         [UIView animateWithDuration:0.001 animations:^{
            myImageView.center = CGPointMake(myImageView.center.x, myImageView.center.y-5); 
        }];
    }
    else if (location.y > myImageView.center.y){
        [UIView animateWithDuration:0.001 animations:^{
            myImageView.center = CGPointMake(myImageView.center.x, myImageView.center.y+5); 
        }];
    }
}

Upvotes: 0

Views: 1685

Answers (2)

Caleb
Caleb

Reputation: 125037

If you want to use a timer to trigger a method that takes parameters, use -scheduledTimerWithTimeInterval:invocation:repeats: with an appropriate instance of NSInvocation in place of one of the methods that take selectors.

That said, you're going to have to reconsider your approach. Individual UIEvent and UITouch objects have a lifetime at least as long as an entire touch sequence. Per the documentation for each of those classes, you shouldn't retain them or otherwise use them outside of the method where you receive them. If you need to save the information from either of those objects for later use, you should copy the information you need into your own storage.

Upvotes: 0

ughoavgfhw
ughoavgfhw

Reputation: 39925

You cannot pass data through a selector. A selector is simply the name of a method, not a call to it. When used with a timer, the selector you pass should accept one argument, and that argument will be the timer which caused it. However, you can pass data to the called method using the userInfo parameter. You pass the event in that parameter, and retrieve it using the userInfo method on the timer.

moveTimer = [NSTimer scheduledTimerWithTimeInterval:0.05 target:self
                                           selector:@selector(move:)
                                           userInfo:event repeats:YES];

- (void)move:(NSTimer *)theTimer {
    UIEvent *event = [theTimer userInfo];
    ...

Upvotes: 3

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