CODEWITHSUNDEEP
iphoneobjective-ccocoa-touchuigesturerecognizeruitapgesturerecognizer
Abhinav
Abhinav

Reputation: 38162

Handling UITapGestureRecognizer in custom view

I have a custom view class. Inside my view controller I add a Tap gesture recognizer on this view object. Now, in the handler of tap gesture I am setting up a property on my view object which I am trying to fetch in the drawRect of my view class. Now, surprisingly when I print view objects in my "handleGesture" & "drawRect", I get two different objects. Because of this my if condition inside drawRect do not get execute. What could be the reason?

It do not come in state UIGestureRecognizerStateBegan. It always coming inside UIGestureRecognizerStateEnded.

// Adding Gesture in my view
 MyCustomView *customView= [[[MyCustomView alloc] init] autorelease];
UIGestureRecognizer *GestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleGesture:)];
        [customView addGestureRecognizer:GestureRecognizer];
        [GestureRecognizer release];

// Handling tap on my view
- (void)handleGesture:(UIGestureRecognizer *)GestureRecognizer; {
    MyCustomView *aView= (MyCustomView *)GestureRecognizer.view;
switch (iGestureRecognizer.state) {
    case UIGestureRecognizerStateBegan:
        NSLog(@"Began");
        [aView setNeedsDisplay];
        aView.touchDown = YES;
        break;
    case UIGestureRecognizerStateEnded:    
        NSLog(@"Ended");
        aView.touchDown = NO;
        [aView setNeedsDisplay];
        break;
    default:
        break;
}
}

// Inside my view class
- (void)drawRect:(CGRect)iRect {
    if (self.touchDown) {
// Do something here
}
}

Upvotes: 1

Views: 1596

Answers (1)

picciano
picciano

Reputation: 22711

There is nothing calling the drawRect method. You don't want to do this directly, but in your handleGesture method, you could put in a call to [aView setNeedsDisplay] and your view's drawRect will get called in the next drawing cycle.

Upvotes: 2

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