關鍵幀動畫

Question

我正在嘗試沿計算出的路徑對圖像進行動畫處理。我從下面的代碼收到沒有錯誤，但圖像不動畫。任何幫助？

UIImageView *rockHand = [[UIImageView alloc] initWithImage:[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"rockHand" ofType:@"png"]]]; 
rockHand.frame = CGRectMake(260, -8, 59, 66); 
[self.view addSubview:rockHand]; 
[self.rockHands addObject:rockHand]; 

int x = 260; 
int y = -8; 
int spring = 15; 
CGMutablePathRef path = CGPathCreateMutable(); 
CGPathAddLineToPoint(path, nil, x, y); 
for (int i = 0; i < 10; i++) { 
    y += (i*2) - spring; 
    x += (i * -0.3) ; 
    spring--; 
    CGPathAddLineToPoint(path, nil, x, y); 
} 

CAKeyframeAnimation *anim = [CAKeyframeAnimation animationWithKeyPath:@"position"]; 
anim.path = path; 
anim.duration = 3; 
anim.fillMode = kCAFillModeForwards; 
anim.calculationMode = kCAAnimationPaced; 
anim.removedOnCompletion = NO; 
[rockHand.layer addAnimation:anim forKey:@"pathAnimation"]; 

Answer 1

解決方案：必須把第一點，以增加別人，所以

CGPathAddLineToPoint(path, nil, x, y); 

必須

CGPathMoveToPoint(path, nil, x, y);