CAAnimation層取消視圖的previos轉換

Question

我正在使用一個簡單的轉換動畫到一個UIIMageView。

[UIView animateWithDuration:2 delay:0 options:UIViewAnimationOptionBeginFromCurrentState|UIViewAnimationOptionCurveEaseInOut animations:^{ 
     CGAffineTransform translate = CGAffineTransformMakeTranslation(0, -[self percentFromHeight:20]); 
     clueImage.transform = translate; 
    } completion:^(BOOL finished) { 
     [self.cluWordSelectionView setaWordsObjects:[NSArray arrayWithArray:[self.whiteCard clueWordObjectsForSoundAtIndex:self.index]]]; 

     [self addSubview:cluWordSelectionView]; 
     [clueImage.layer addAnimation:[Animations shakeAnimation] forKey:@"shake"]; 

    }]; 

正如你可以看到我添加的其他抖動動畫視圖完成後：

[clueImage.layer addAnimation:[Animations shakeAnimation] forKey:@"shake"]; 

它看起來像：

+(CAAnimation*)shakeAnimation { 

CAKeyframeAnimation* animation = [CAKeyframeAnimation animationWithKeyPath:@"transform"]; 

CGFloat wobbleAngle = 0.06f; 

NSValue* valLeft = [NSValue valueWithCATransform3D:CATransform3DMakeRotation(wobbleAngle, 0.0f, 0.0f, 1.0f)]; 
NSValue* valRight = [NSValue valueWithCATransform3D:CATransform3DMakeRotation(-wobbleAngle, 0.0f, 0.0f, 1.0f)]; 
animation.values = [NSArray arrayWithObjects:valLeft, valRight, nil]; 
animation.beginTime = 3; 
animation.autoreverses = YES; 
animation.duration = 0.125; 
animation.repeatCount = HUGE_VALF; 

return animation; 

} 

的問題是，當shakeAnimation開始視圖「跳轉」回到它的原始位置。我怎樣才能防止這種情況發生，爲什麼會這樣呢？

感謝

SHANI

Answer 1

新的動畫應該採取當前變換（平移）到：

CATransform3D leftTransform = CATransform3DMakeRotation(wobbleAngle, 0.0f, 0.0f, 1.0f); 
    leftTransform = CATransform3DConcat(layer.transform, leftTransform); 
    CATransform3D rightTransform = CATransform3DMakeRotation(-wobbleAngle, 0.0f, 0.0f, 1.0f); 
    rightTransform = CATransform3DConcat(layer.transform, rightTransform); 

    NSValue* valLeft = [NSValue valueWithCATransform3D:leftTransform]; 
    NSValue* valRight = [NSValue valueWithCATransform3D:rightTransform]; 

哪裏layer是將動畫層。