Objective-c 动画

-(void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:YES];

UIImageView     *imgView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"LuckyCenterButton"]];
imgView.backgroundColor=[UIColor redColor];
imgView.frame = CGRectMake(100, 100, 50, 50);
[self addSubview:imgView];

//贝塞尔曲线路径
UIBezierPath *movePath = [UIBezierPath bezierPath];
// 设置动画的起点坐标
[movePath moveToPoint:CGPointMake(DEVICE_Width/2-25, DEVICE_Height/2-25)];
//    、CABasicAnimation可看做是最多只有2个关键帧的CAKeyframeAnimation

/*  [_pushCoverMudimViewController.view.superview addSubview:_customActionSheet];
CAKeyframeAnimation *popAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform"];
popAnimation.duration = 0.4;
popAnimation.values = @[[NSValue valueWithCATransform3D:CATransform3DMakeScale(0.01f, 0.01f, 1.0f)],
[NSValue valueWithCATransform3D:CATransform3DMakeScale(1.1f, 1.1f, 1.0f)],
[NSValue valueWithCATransform3D:CATransform3DMakeScale(0.9f, 0.9f, 1.0f)],
[NSValue valueWithCATransform3D:CATransform3DIdentity]];
popAnimation.keyTimes = @[@0.2f, @0.5f, @0.75f, @1.0f];
popAnimation.timingFunctions = @[[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
[_customActionSheet.layer addAnimation:popAnimation forKey:nil];
*/

[movePath addQuadCurveToPoint:CGPointMake(DEVICE_Width,0) controlPoint:self.view.center];

//以下必须导入QuartzCore包
　// 关键帧动画（位置）
CAKeyframeAnimation * posAnim = [CAKeyframeAnimation animationWithKeyPath:@"position"];
posAnim.path = movePath.CGPath;
posAnim.removedOnCompletion = YES;

//缩放动画
CABasicAnimation *scaleAnim = [CABasicAnimation animationWithKeyPath:@"transform"];
scaleAnim.fromValue = [NSValue valueWithCATransform3D:CATransform3DIdentity];

//动画时的放大缩小倍数
scaleAnim.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(0.3, 0.3, 1)];
scaleAnim.removedOnCompletion = YES;

//透明动画
CABasicAnimation *opacityAnim = [CABasicAnimation animationWithKeyPath:@"alpha"];
opacityAnim.fromValue = [NSNumber numberWithFloat:1.0];
opacityAnim.toValue = [NSNumber numberWithFloat:0.1];
opacityAnim.removedOnCompletion = YES;

//动画组
CAAnimationGroup *animGroup = [CAAnimationGroup animation];

animGroup.animations = [NSArray arrayWithObjects:posAnim, scaleAnim, opacityAnim, nil];
animGroup.duration = 10;
//  这里需要对动画的两个属性进行设置，让图层在完成动画后停留在动画后的状态。a
animGroup.fillMode = kCAFillModeForwards;
animGroup.removedOnCompletion = NO;
[imgView.layer addAnimation:animGroup forKey:nil];

}