组动画 CAAnimationGroup

 //缩放动画

                       CABasicAnimation *scalAni = [CABasicAnimationanimationWithKeyPath:@"transform.scale"];

                       scalAni.fromValue = [NSNumbernumberWithFloat:1];

                       scalAni.toValue = [NSNumbernumberWithFloat:0.3];

                       scalAni.timingFunction = [CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionEaseInEaseOut];

                       //透明动画

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

                       opacityAni.fromValue = [NSNumbernumberWithFloat:1.0];

                       opacityAni.toValue = [NSNumbernumberWithFloat:0.f];

                       opacityAni.timingFunction = [CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionEaseInEaseOut];

                       CAAnimationGroup *animGroup_ = [CAAnimationGroupanimation];

                       animGroup_.animations = [NSArrayarrayWithObjects:scalAni,opacityAni,nil];

                       animGroup_.duration =.5;

//保持目前的动画状态 必须下面两句一起否则会出问题

                       animGroup_.removedOnCompletion =NO;

                       animGroup_.fillMode =kCAFillModeForwards;

                       [view.layeraddAnimation:animGroup_forKey:nil];