ios - 画像を元から回転させて元に戻す方法は?

Question

CGAffineTransformMakeRotationと を使用して画像を回転させようとしましたCGAffineTransformRotate。画像を元の画像から時計回りに元の画像に再び回転させたい（0度から360度のように）。プレーヤーでCDのように画像を回転させる必要があります。私はこのようなことをしました：

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.1];  
CGAffineTransform transform = CGAffineTransformMakeRotation(1.0);
transform = CGAffineTransformRotate(transform, -180);
ImageView.transform = transform;

[UIView commitAnimations];

180度回転するだけで、-300度に変更すると反時計回りに回転します(これは必要ありません)。

Answer 1

これを試して：

-(void)startAnimationWithRevolutions:(float)revPerSecond forTime:(float)time
{
    spinWheel.userInteractionEnabled = FALSE;
    float totalRevolutions = revPerSecond * time;
    [CATransaction begin];
[CATransaction setValue:[NSNumber numberWithFloat:time] forKey:kCATransactionAnimationDuration];

    CABasicAnimation* spinAnimation = [CABasicAnimation
                                       animationWithKeyPath:@"transform.rotation"];
    CGAffineTransform transform = spinWheel.transform;
    float fromAngle = atan2(transform.b, transform.a);
    float toAngle = fromAngle + (totalRevolutions*4*M_PI);
    spinAnimation.fromValue = [NSNumber numberWithFloat:fromAngle];
    spinAnimation.toValue = [NSNumber numberWithFloat:toAngle];
    spinAnimation.repeatCount = 0;
    spinAnimation.removedOnCompletion = NO;
    spinAnimation.delegate = self;
    spinAnimation.timingFunction = [CAMediaTimingFunction functionWithName:
                                    kCAMediaTimingFunctionEaseOut];
    [spinWheel.layer addAnimation:spinAnimation forKey:@"spinAnimation"];
    [CATransaction commit];
}

Answer 2

これを使って：

[UIView animateWithDuration:0.1 animations:^{
    CGAffineTransform transform = CGAffineTransformMakeRotation(1.0);
    transform = CGAffineTransformRotate(transform, -180);
    ImageView.transform = transform;
} completion:^(BOOL finished) {
    CGAffineTransform transform = CGAffineTransformMakeRotation(0);
    transform = CGAffineTransformRotate(transform,0);
    ImageView.transform = transform;
}];