Animation speed is different from beginAnimations and uses an animation block.

Question

I am trying to convert some animation code that uses beginAnimations to use animation blocks. The problem I am facing is that when I use animation blocks, the animations go much faster and I can’t adjust the speed by changing the duration value

This is where I started initially:

birdFly.image = [UIImage imageNamed: @"bird1.png"];
[self.view addSubview:birdFly];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:20];
birdFly.frame = CGRectMake(-1116,27,111,48);
[UIView commitAnimations];
[birdFly release];

This is what I tried to first replace with what I had above. Using this code, the animation is much faster than using the source code. Even changing the duration does not change the speed at all:

birdFly.image = [UIImage imageNamed: @"bird1.png"];
[self.view addSubview:birdFly];
[UIView animateWithDuration:20
    animations:^{
        birdFly.frame = CGRectMake(-1116,27,111,48);
    }];

I also tried this, thinking that I needed a completion block, but the speed was still as fast compared to what I originally had when I did not use blocks.

birdFly.image = [UIImage imageNamed: @"bird1.png"];
[self.view addSubview:birdFly];     
UIViewAnimationOptions options = UIViewAnimationOptionCurveEaseInOut | UIViewAnimationOptionAllowUserInteraction;
        [UIView animateWithDuration:20 delay:0.0 options:options animations:^
        {
            birdFly.frame = CGRectMake(-1116,27,111,48);
        } completion:nil];

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Answer 1

, -animateWithDuration:animations: . UIViewAnimationOptionOverrideInheritedDuration (, , UIViewAnimationOptionOverrideInheritedCurve, ).