Geek asks and answers

UIView two animations coexisting

How can I continue the animation forever after calling the second animation? For instance:

1) start the pulsating object 2) Move it while its pulsating 3) it continues to pulsate

Everything works, except that the second animation stops the first for an indefinite period. The following is sample code:

//Pulsate **

        [UIView animateWithDuration:0.25
                              delay:0
                            options: (UIViewAnimationCurveEaseOut | UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionRepeat)
                         animations:^{
                             CGAffineTransform currentTransform = self.transform;
                             CGAffineTransform newTransform1 = CGAffineTransformScale(currentTransform, .95, .95);
                             [self setTransform:newTransform1];
                             CGAffineTransform newTransform2 = CGAffineTransformScale(currentTransform, 1, 1);
                             [self setTransform:newTransform2];
                         } 
                         completion:nil];    


//Move **
     [UIView animateWithDuration:0.30
                      delay:0
                    options: (UIViewAnimationCurveEaseOut | UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionBeginFromCurrentState )
                 animations:^{
                     [[(UIPinchGestureRecognizer*)sender view] setCenter:CGPointMake(myAppDelegate.MCViewReference.center.x-300, myAppDelegate.MCViewReference.center.y)];
                 } 
                 completion:^(BOOL finished){
                }];
+3
source share
2 answers

You will not be able to do this with block-based animations like you have here. You need to split the animation using explicit animations with CABasicAnimation. Create one animation for the pulsating effect and set it to an indefinite time. You can then move it by setting the center (animated or non-animated).

CABasicAnimation *pulsation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
pulsation.fromValue = [NSNumber numberWithFloat:0.95f];
pulsation.toValue = [NSNumber numberWithFloat:1.f];
pulsation.duration = 0.25f;
pulsation.autoreverses = YES;
pulsation.repeatCount = INFINITY;

[self.layer addAnimation:pulsation forKey:@"pulse"];

, . , [self.layer removeAnimationForKey:@"pulse" removeAllAnimations:.

+5

, .

+1

More articles:


All Articles