組合動畫CAAnimationGroup

先在自定義的ViewController里聲明定義一個UIImageView

@property (nonatomic,retain) UIImageView *imgView;

@synthesize imgView;

在viewDidLoad函數里添加圖片，並執行組合動畫

　　 //添加圖片
    imgView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"[e-mail]"]];
    imgView.frame = CGRectMake(100, 100, imgView.frame.size.width, imgView.frame.size.height);
    [self.view addSubview:imgView];
    [imgView release];
    
    //貝塞爾曲線路徑
    UIBezierPath *movePath = [UIBezierPath bezierPath];
    [movePath moveToPoint:CGPointMake(10.0, 10.0)];
    [movePath addQuadCurveToPoint:CGPointMake(100, 300) controlPoint:CGPointMake(300, 100)];
    
    //以下必須導入QuartzCore包
　　//關鍵幀動畫（位置）
    CAKeyframeAnimation * posAnim = [CAKeyframeAnimation animationWithKeyPath:@"position"];
    posAnim.path = movePath.CGPath;
    posAnim.removedOnCompletion = YES;
    
    //縮放動畫
    CABasicAnimation *scaleAnim = [CABasicAnimation animationWithKeyPath:@"transform"];
    scaleAnim.fromValue = [NSValue valueWithCATransform3D:CATransform3DIdentity];
    scaleAnim.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(0.1, 0.1, 1.0)];
    scaleAnim.removedOnCompletion = YES;
    
    //透明動畫
    CABasicAnimation *opacityAnim = [CABasicAnimation animationWithKeyPath:@"alpha"];
    opacityAnim.fromValue = [NSNumber numberWithFloat:1.0];
    opacityAnim.toValue = [NSNumber numberWithFloat:0.1];
    opacityAnim.removedOnCompletion = YES;
    
    //動畫組
    CAAnimationGroup *animGroup = [CAAnimationGroup animation];
    animGroup.animations = [NSArray arrayWithObjects:posAnim, scaleAnim, opacityAnim, nil];
    animGroup.duration = 1;
    
    [imgView.layer addAnimation:animGroup forKey:nil];