ios UIView animation curves - uiviewanimation

Question

Is there any way to do things the "short and easy" way like below? The curve appears to still use EaseOut.
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
[UIView animateWithDuration:0.5 animations:^{
// ... do stuff here
}];

Answer 1

You are mixing two different kinds of UIView-animations. You should be using something like this either of these:
[UIView animateWithDuration:0.5
delay:0.0
options:UIViewAnimationOptionCurveEaseIn
animations:^{
// ... do stuff here
} completion:NULL];
This came from the newer block-based UIView-animation API. The first line, on the other hand, is part of the older UIView animation API that looks like this:
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
// ... do stuff here
[UIView commitAnimations];
They do the same thing and you can use either (though Apple recommends the block-based API since it is easier/cleaner to do callbacks after the animation finishes).

Answer 2

You can do it using Core Animation , CAKeyFrameAnimation to define the curve points. See this tutorial: http://nachbaur.com/blog/core-animation-part-4

Answer 3

Let's take curve points p1, p2, p3, p4 and p5, & find mid point for each pair of adjacent points. Label m1 as the mid point for p1 and p2. Similarly for m2, m3, m4.
Add quad curve to point m2 with p2 as a control point.
Add quad curve to point m3 with p3 as a control point.
Add quad curve to point m4 with p4 as a control point.
Code:
CGFloat screenHeight = self.view.frame.size.height;
CGFloat screenWidth = self.view.frame.size.width;
UIView *aniView = [[UIView alloc] initWithFrame:CGRectMake(50, screenHeight, 50, 50)];
[aniView setBackgroundColor:[UIColor redColor]];
aniView.layer.cornerRadius = 25.0;
[self.view addSubview:aniView];
UIBezierPath *movePath = [UIBezierPath bezierPath];
[movePath moveToPoint:aniView.center];
[movePath addQuadCurveToPoint:CGPointMake(screenWidth-50,screenHeight-50)
controlPoint:CGPointMake(screenWidth/2,screenHeight-150)];
CAKeyframeAnimation *moveAnim = [CAKeyframeAnimation animationWithKeyPath:#"position"];
moveAnim.path = movePath.CGPath;
moveAnim.removedOnCompletion = YES;
CAAnimationGroup *animGroup = [CAAnimationGroup animation];
animGroup.animations = [NSArray arrayWithObjects:moveAnim, nil];
animGroup.duration = 2.0;
[CATransaction begin]; {
[CATransaction setCompletionBlock:^{
[aniView.layer removeAllAnimations];
[aniView removeFromSuperview];
}];
[aniView.layer addAnimation:animGroup forKey:nil];
} [CATransaction commit];
Copy past above code into some method and try calling the method...