ios,objective-c,animation,objective-c-blocks , Objective-C: Animations in Blocks
Objective-C: Animations in Blocks
Question:
Tag: ios,objective-c,animation,objective-c-blocks
I have a UIImageView sliderPump which I move from right to left side of the screen infinite times by calling two methods one after another:
-(void)pumpGoesRight
{
if (slide)
{
[UIView animateWithDuration:0.8 animations:^
{
[sliderPump setFrame:CGRectMake(sliderPump.frame.origin.x+235, sliderPump.frame.origin.y, sliderPump.frame.size.width, sliderPump.frame.size.height)];
} completion:^(BOOL finished)
{
[self pumpGoesLeft];
}];
}
else
return;
}
-(void)pumpGoesLeft
{
if (slide)
{
[UIView animateWithDuration:0.8 animations:^
{
[sliderPump setFrame:CGRectMake(sliderPump.frame.origin.x-235, sliderPump.frame.origin.y, sliderPump.frame.size.width, sliderPump.frame.size.height)];
} completion:^(BOOL finished)
{
[self pumpGoesRight];
}];
[self performSelector:@selector(pumpGoesRight) withObject:nil afterDelay:0.8];
}
else
return;
}
And I use this code to find out the X position of the UIImageView sliderPump and stop the animation:
-(void)stop
{
slide = NO;
NSLog(@"Slide Pump position: %f", sliderPump.layer.frame.origin.x);
[self.view.layer removeAllAnimations];
}
The problem is that when I call stop method, I suppose to get a current position of the sliderPump, but what I get is the final position of the sliderPimp at the end of the animation, even if the animation is not completed yet. How can I get the current position of the frame? Thanks!
Answer:
You should use the presentation layer.
NSLog(@"Slide Pump position: %f", [sliderPump.layer.presentationLayer frame].origin.x);
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