Core Animation CALayer动画

-(UIImage*) circleImage:(UIImage*) image withParam:(CGFloat) inset

{

    UIGraphicsBeginImageContext(image.size);

CGContextRef context =UIGraphicsGetCurrentContext();

    //设置线宽

    CGContextSetLineWidth(context,12);

    

   //线色

    CGContextSetStrokeColorWithColor(context,self.view.backgroundColor.CGColor);

    

    // 设置图片区域

CGRect rect =CGRectMake(inset, inset, image.size.width - inset *2.0f, image.size.height - inset *2.0f);

CGContextAddEllipseInRect(context, rect);

CGContextClip(context);

[imagedrawInRect:rect];

    CGContextAddEllipseInRect(context, rect);

CGContextStrokePath(context);

    UIImage *newimg =UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

   return newimg;

}

-(void)footballView

{

   UIImage* image = [UIImageimageNamed:@"football.png"];

   UIImage* image1 = [selfcircleImage:image withParam:0];

    

   self.imageView.image = image1;

    self.imageView.frame =CGRectMake(0,self.topLayoutGuide.length,100, 100);

    self.imageView.userInteractionEnabled =YES;

    UITapGestureRecognizer* tapGR = [[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(startFootball:)];

    [self.imageViewaddGestureRecognizer:tapGR];

    

   UIImageView* imageView1 = [[UIImageViewalloc]initWithImage:image];

    imageView1.layer.masksToBounds =YES;

    imageView1.layer.cornerRadius =50;

    imageView1.frame =CGRectMake(200,200, 100, 100);

    [self.viewaddSubview:imageView1];

    

}

-(void)viewDidLayoutSubviews

{

    [superviewDidLayoutSubviews];

    [selffootballView];

   

}

-(void)startFootball:(UITapGestureRecognizer*)sender

{

    // 按照路径移动

    CGFloat fWidth =self.view.frame.size.width;

    CGFloat fHeight =self.view.frame.size.height;

    

    UIBezierPath* path = [UIBezierPathbezierPath];

    [pathmoveToPoint:self.imageView.center];

    [path addQuadCurveToPoint:CGPointMake(fWidth-100, fHeight-50)controlPoint:CGPointMake(fWidth-150,50)];

    

    CAKeyframeAnimation* movePathAnimation = [CAKeyframeAnimationanimationWithKeyPath:@"position"];

    movePathAnimation.path = path.CGPath;

    movePathAnimation.removedOnCompletion =YES;

    // 必须用transform才有动画

    CABasicAnimation* scaleAnimation = [CABasicAnimationanimationWithKeyPath:@"transform"];

    scaleAnimation.fromValue = [NSValuevalueWithCATransform3D:CATransform3DIdentity];

    scaleAnimation.toValue = [NSValuevalueWithCATransform3D:CATransform3DMakeScale(0.1,0.1, 1.0)];

    movePathAnimation.removedOnCompletion =YES;

    

    CAAnimationGroup * animationGroup = [CAAnimationGroupanimation];

    CABasicAnimation* alphaAnimation = [CABasicAnimationanimationWithKeyPath:@"opacity"];

    alphaAnimation.fromValue =@1.0;

    alphaAnimation.toValue = [NSNumbernumberWithInt:0];

    movePathAnimation.removedOnCompletion =YES;

    

    animationGroup.animations =@[movePathAnimation,scaleAnimation,alphaAnimation];

    animationGroup.duration =2;

    [self.imageView.layeraddAnimation:animationGroup forKey:nil];

}