问题
i had tried various method and couldn't figure out how to achieve this.i searched on internet a lot but can't figure out.
i have an ImageView (a wheel which spins) , i want to rotate it by 360 degree for 10 times(this is to just give user feel of fast turning wheel) , and then i want to rotate it by particular value say 90 degree( but it might be varying).
after this animation finishes i want to bring ImageView back to the initial position.
how do i achieve this ? Thanks in advance.
回答1:
well i found out how to do this. i used below method to rotate by 360 degree for 10 times , and then rotate by particular degree.
-(void)rotate:(int)degreeToRotate
{
CGFloat radians = (M_PI/180) * degreeToRotate;
[UIView animateWithDuration:2 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations: ^{
//configuring to rotate 360 degree 10 times
CABasicAnimation* rotationAnimation;
rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2.0 ];
rotationAnimation.cumulative = YES;
rotationAnimation.repeatCount = 10;
[_scoreImageView.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];
} completion:^(BOOL finished) {
//rotate by particular degree
[ UIView animateWithDuration:2 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
// -radians, to ensure clockwise rotation
self.scoreImageView.transform = CGAffineTransformMakeRotation(-radians);
} completion:^(BOOL finished) {
//method call to reset image original position
[self performSelector:@selector(resetPosition) withObject:nil afterDelay:3];
}];
}];
}
below method is used to reset image to original position.
-(void)resetPosition
{
[UIView animateWithDuration:0.2 animations:^() {
self.scoreImageView.transform = CGAffineTransformIdentity;
}];
}
来源：https://stackoverflow.com/questions/44854367/rotating-image-multiple-times-and-stopping-at-desired-degree