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iOS淘宝购物界面动画解析

iOS淘宝购物界面动画解析

作者: 游某人 | 来源:发表于2016-11-11 17:20 被阅读145次
    • 首先我要说的是点击加入购物车按钮弹出View的动画解析,而不是什么点击商品图片飞来飞去的动画,效果是这样的:
    taobao2.gif
    • 乍一看很简单,不就把它放大缩小一下,你要这么做效果那真是惨不能睹,仔细观察手机淘宝这个动画效果,一气呵成,有3D效果,像一张纸一样往下落的感觉。由于产品的需求,一开始毫无头绪,网上的第三方做出效果我很不满意:
    disanfang.gif
    动画过程给人感觉很突兀,衔接不够流畅,一个动画需要两个阶段完成,这就导致不够顺滑。

    该动画效果可以由缩小,旋转,平移,下落动画并发执行得到的结果,可以使用核心动画组来实现并发的动画;

    View弹出的动画:背景下落,popview弹出,使用核心动画组实现
    x, y轴方向分别缩放,z轴方向下落,根据锚点绕x轴旋转,再加入y轴方向的平移,使其有飘来飘去的感觉。
    效果如下:

    popView.gif

    代码如下:
    popView出现的时候:

    //该方法是并发,所以不影响核心动画的执行,为什么需要这个方法,因为我们还需要对popview和coverView进行操作,对不需要操作的self.View就可以使用核心动画
    [UIView animateWithDuration:0.5 animations:^{
            popView.yqh_y = (MAINHEIGHT - 280);
            coverView.alpha = 0.3;
        }];
        
    //注意设置锚点和位置点,因为旋转和缩放都是按照锚点来的
        self.view.layer.anchorPoint = CGPointMake(0.5, 0.8);
        self.view.layer.position = CGPointMake(self.view.yqh_width * .5, self.view.yqh_height * .8);
        CATransform3D tran = CATransform3DIdentity;
    //设置近大远小的效果,值越大效果越明显,所以不要太大
        tran.m34 = -1.0/1000;
        self.view.layer.transform = tran;
        
    //核心动画也是并发
        CABasicAnimation *scaleAnimateX = [CABasicAnimation animationWithKeyPath:@"transform.scale.x"];
        scaleAnimateX.toValue = @(0.9);
    //延迟0.2秒执行
        scaleAnimateX.beginTime = 0.2;
        
        CABasicAnimation *scaleAnimateY = [CABasicAnimation animationWithKeyPath:@"transform.scale.y"];
        scaleAnimateY.toValue = @(0.9);
        scaleAnimateY.beginTime = 0.2;
        
        CABasicAnimation *positonY = [CABasicAnimation animationWithKeyPath:@"transform.translation.y"];
        positonY.toValue = @(-60);
        
        CABasicAnimation *positonZ = [CABasicAnimation animationWithKeyPath:@"transform.translation.z"];
        positonZ.toValue = @(-100);
        
        CAKeyframeAnimation *rotation = [CAKeyframeAnimation animation];
        rotation.keyPath = @"transform.rotation.x";
        rotation.values = @[@(0), @(15 / 180.0 * M_PI), @(0)];
        rotation.repeatCount = 1;
        
        CAAnimationGroup *group = [CAAnimationGroup animation];
        group.animations = @[scaleAnimateX, scaleAnimateY, rotation, positonY, positonZ];
        group.duration = 0.5;
        
    //动画结束不恢复原状
        group.removedOnCompletion = NO;
        group.fillMode = kCAFillModeForwards;
        [self.view.layer addAnimation:group forKey:nil];
    

    popView消失的时候:

    [UIView animateWithDuration:0.5 animations:^{
    //popview消失
            self.popView.yqh_y = MAINHEIGHT;
            self.coverView.alpha = 0;
        }completion:^(BOOL finished) {
            [self.popView removeFromSuperview];
            [self.coverView removeFromSuperview];
    //移除动画
            [self.view.layer removeAllAnimations];
    //恢复默认的锚点和位置点
            self.view.layer.anchorPoint = CGPointMake(0.5, 0.5);
            self.view.layer.position = CGPointMake(self.view.yqh_width * .5, self.view.yqh_height * .5);
        }];
        
    //恢复的动画跟上面的相反
        CATransform3D tran = CATransform3DIdentity;
        tran.m34 = -1.0/1000;
        self.view.layer.transform = tran;
        
        CABasicAnimation *scaleAnimateX = [CABasicAnimation animationWithKeyPath:@"transform.scale.x"];
        scaleAnimateX.toValue = @(1.0);
        
        CABasicAnimation *scaleAnimateY = [CABasicAnimation animationWithKeyPath:@"transform.scale.y"];
        scaleAnimateY.toValue = @(1.0);
        
        CABasicAnimation *positonY = [CABasicAnimation animationWithKeyPath:@"transform.translation.y"];
        positonY.toValue = @(0);
        
        CABasicAnimation *positonZ = [CABasicAnimation animationWithKeyPath:@"transform.translation.z"];
        positonZ.toValue = @(0);
        
        CAKeyframeAnimation *rotation = [CAKeyframeAnimation animation];
        rotation.keyPath = @"transform.rotation.x";
        rotation.values = @[@(0), @(15 / 180.0 * M_PI), @(0)];
        rotation.repeatCount = 1;
        
        CAAnimationGroup *group = [CAAnimationGroup animation];
        group.animations = @[scaleAnimateX, scaleAnimateY, rotation, positonY, positonZ];
        group.duration = 0.5;
        
        group.removedOnCompletion = NO;
        group.fillMode = kCAFillModeForwards;
        [self.view.layer addAnimation:group forKey:nil];
    

    唉,也懒得封装了,大家可以给uiviewcontroller写个分类,到时候就可以用上了。。。

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