沿路徑動畫 - 完成方法調用太早

Question

我想沿圓形路徑實現動畫，並在動畫結束後立即觸發完成功能。

由於這個post我想出如何使用CAKeyframeAnimation與CGMutablePathRef沿路徑進行動畫。

CAKeyframeAnimation *pathAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"]; 
pathAnimation.calculationMode = kCAAnimationPaced; 
pathAnimation.fillMode = kCAFillModeForwards; 
pathAnimation.removedOnCompletion = NO; 
pathAnimation.duration = 1.0; 

CGPoint endPoint = CGPointMake(self.boardReference.view.bounds.size.width/2,self.boardReference.view.bounds.size.height/2); 
CGMutablePathRef curvedPath = CGPathCreateMutable(); 
CGPathMoveToPoint(curvedPath, NULL, self.view.center.x, self.view.center.y); 
CGPathAddCurveToPoint(curvedPath, NULL, endPoint.x, self.view.center.y, endPoint.x, self.view.center.y, endPoint.x, endPoint.y); 
pathAnimation.path = curvedPath; 
CGPathRelease(curvedPath); 
[self.view.layer addAnimation:pathAnimation forKey:@"curvedPath"]; 

[self addNewCardAtPoint:endPoint]; //This should only be launched after the animation has been finished 

問題：我的方法addNewCardAtPoint只應調用動畫後已經完成。目前該進程沒有被阻塞，所以該方法或多或少被同時調用。

在第一個視圖中，animateWithDuration函數似乎更適合，因爲它已經爲動畫和完成操作定義了塊。但是簡單地將CAKeyframeAnimation添加到動畫塊的結果基本相同，立即執行完成塊。

[UIView animateWithDuration:0.8 
       animations:^{ 
        NSLog(@"-Animate on curved path to end point-"); 
        ... //how perform the same path based animation here? 
       } completion:^(BOOL finished) { 
        [self addNewCardAtPoint:self.view.center]; 
       } 
]; 

只有在沿着彎曲路徑的動畫完成後，我如何才能激發完整的功能？

Answer 1

當CAAnimation完成後，它將在其委託上調用animationDidStop:finished:方法。