干货系列之手把手教你使用Core animation 做动画

作者: Airfei | 来源:发表于2015-12-16 13:18 被阅读5386次

源码下载：源码

最近在技术群里，有人发了一张带有动画效果的图片。觉得很有意思，便动手实现了一下。在这篇文章中你将会学到Core Animation显式动画中的关键帧动画、组合动画、CABasicAnimation动画。先上一张原图的动画效果。

点击此查看[原图动画效果](https://github.com/WZF-Fei/ZFChangeAnimation/blob/master/origin animation.gif)。

本文要实现的效果图如下：

实现的效果图.gif

把原动画gif动画在mac上使用图片浏览模式打开，我们可以看到动画每一帧的显示。从每一帧上的展示过程，可以把整体的动画进行拆分成两大部分。

第一部分（Part1）从初始状态变成取消状态（图片上是由横实线变成上线横线交叉的圆）。
第二部分（Part2）从取消状态变回初始状态。

下面我们先详细分析Part1是怎么实现的。根据动画图，把Part1再细分成三步。

Step1 : 中间横实线的由右向左的运动效果。这其实是一个组合动画。是先向左偏移的同时横线变短。先看一下实现的动态效果。

step1 Animation.gif
■ 向左偏移---使用基本动画中animationWithKeyPath键值对的方式来改变动画的值。我们这里使用position.x,同样可以使用transform.translation.x来平移。

■ 改变横线的大小---使用经典的strokeStart和strokeEnd。其实上横线长度的变化的由strokeStart到strokeEnd之间的值来共同来决定。改变strokeEnd的值由1.0到0.4，不改变strokeStart的值。横线的长度会从右侧方向由1.0倍长度减少到0.4倍长度。参见示意图的红色区域。

stroke示意图.png

-(void) animationStep1{
    
    //最终changedLayer的状态
    _changedLayer.strokeEnd = 0.4;
    //基本动画，长度有1.0减少到0.4
    CABasicAnimation *strokeAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
    strokeAnimation.fromValue = [NSNumber numberWithFloat:1.0f];
    strokeAnimation.toValue = [NSNumber numberWithFloat:0.4f];
    //基本动画，向左偏移10个像素
    CABasicAnimation *pathAnimation = [CABasicAnimation animationWithKeyPath:@"position.x"];
    pathAnimation.fromValue = [NSNumber numberWithFloat:0.0];
    pathAnimation.toValue = [NSNumber numberWithFloat:-10];
    //组合动画，平移和长度减少同时进行
    CAAnimationGroup *animationGroup = [CAAnimationGroup animation];
    animationGroup.animations = [NSArray arrayWithObjects:strokeAnimation,pathAnimation, nil];
    animationGroup.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
    animationGroup.duration = kStep1Duration;
    //设置代理
    animationGroup.delegate = self;
    animationGroup.removedOnCompletion = YES;
    //监听动画
    [animationGroup setValue:@"animationStep1" forKey:@"animationName"];
    //动画加入到changedLayer上
    [_changedLayer addAnimation:animationGroup forKey:nil];
}

Step2 : 由左向右的动画--向右偏移同时横线长度变长。看一下Step2要实现的动画效果。其思路和Step1是一样的。

step2 Animation.gif

-(void)animationStep2
{
    CABasicAnimation *translationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.translation.x"];
    translationAnimation.fromValue = [NSNumber numberWithFloat:-10];
    //strokeEnd:0.8 剩余的距离toValue = lineWidth * (1 - 0.8);

    translationAnimation.toValue = [NSNumber numberWithFloat:0.2 * lineWidth ];
    
    _changedLayer.strokeEnd = 0.8;
    CABasicAnimation *strokeAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
    strokeAnimation.fromValue = [NSNumber numberWithFloat:0.4f];
    strokeAnimation.toValue = [NSNumber numberWithFloat:0.8f];
    
    CAAnimationGroup *animationGroup = [CAAnimationGroup animation];
    animationGroup.animations = [NSArray arrayWithObjects:strokeAnimation,translationAnimation, nil];
    animationGroup.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
    animationGroup.duration = kStep2Duration;
    //设置代理
    animationGroup.delegate = self;
    animationGroup.removedOnCompletion = YES;
    [animationGroup setValue:@"animationStep2" forKey:@"animationName"];
    [_changedLayer addAnimation:animationGroup forKey:nil];
}

Step3: 圆弧的动画效果和上下两个横实线的动画效果。

画圆弧，首先想到是使用UIBezierPath。画个示意图来分析动画路径。示意图如下：

step3 示意图.jpg

整个path路径是由三部分组成，ABC曲线、CD圆弧、DD′圆。
使用UIBezierPath的方法

- (void)appendPath:(UIBezierPath *)bezierPath;

把三部分路径关联起来。详细讲解思路。

• ABC曲线就是贝塞尔曲线，可以根据A、B、C三点的位置使用方法

//endPoint 终点坐标 controlPoint1 起点坐标
//controlPoint2 起点和终点在曲线上的切点延伸相交的交点坐标
- (void)addCurveToPoint:(CGPoint)endPoint 
          controlPoint1:(CGPoint)controlPoint1 
          controlPoint2:(CGPoint)controlPoint2;

二次贝塞尔曲线示意图如下：

二次贝塞尔曲线.png

其中control point 点是从曲线上取 start point和end point 切点相交汇的所得到的交点。如下图：

control point .png

首先C点取圆上的一点，-30°。那么，

CGFloat angle = Radians(30);

C点坐标为：

    //C点
    CGFloat endPointX = self.center.x + Raduis * cos(angle);
    CGFloat endPointY = kCenterY - Raduis * sin(angle);

A点坐标为：

    //A点 取横线最右边的点
    CGFloat startPointX = self.center.x + lineWidth/2.0 ;
    CGFloat startPointY = controlPointY;

control point 为E点：

    //E点 半径*反余弦(30°)
    CGFloat startPointX = self.center.x + Raduis *acos(angle);
    CGFloat startPointY = controlPointY;

• CD圆弧的路径使用此方法确定

+ (instancetype)bezierPathWithArcCenter:(CGPoint)center radius:(CGFloat)radius startAngle:(CGFloat)startAngle endAngle:(CGFloat)endAngle clockwise:(BOOL)clockwise;

关于弧度问题，UIBezierPath的官方文档中的这张图：

弧度.jpg

StartAngle 弧度即C点弧度，EndAngel弧度即D点弧度。

CGFloat StartAngle = 2 * M_PI - angle;
CGFloat EndAngle = M_PI + angle;

• DD′圆的路径和上面2一样的方法确定。

StartAngle 弧度即D点弧度，EndAngel弧度即D′点弧度。

CGFloat StartAngle = M_PI *3/2 - (M_PI_2 -angle);
CGFloat EndAngle = -M_PI_2 - (M_PI_2 -angle);

下面部分代码是所有path路径。

    UIBezierPath *path = [UIBezierPath bezierPath];
    
    // 画贝塞尔曲线 圆弧
    [path moveToPoint:CGPointMake(self.center.x +  lineWidth/2.0 , kCenterY)];
    
     CGFloat angle = Radians(30);
    //C点
    CGFloat endPointX = self.center.x + Raduis * cos(angle);
    CGFloat endPointY = kCenterY - Raduis * sin(angle);
    //A点
    CGFloat startPointX = self.center.x + lineWidth/2.0;
    CGFloat startPointY = kCenterY;
    //E点 半径*反余弦(30°)
    CGFloat controlPointX = self.center.x + Raduis *acos(angle);
    CGFloat controlPointY = kCenterY;

    //贝塞尔曲线 ABC曲线
    [path addCurveToPoint:CGPointMake(endPointX, endPointY)
            controlPoint1:CGPointMake(startPointX , startPointY)
            controlPoint2:CGPointMake(controlPointX , controlPointY)];
    
    // （360°- 30°） ->（180°+30°） 逆时针的圆弧 CD圆弧
    UIBezierPath *path1 = [UIBezierPath bezierPathWithArcCenter:CGPointMake(self.center.x,kCenterY)
                                                         radius:Raduis
                                                     startAngle:2 * M_PI - angle
                                                       endAngle:M_PI + angle
                                                      clockwise:NO];
    [path appendPath:path1];
     // （3/2π- 60°） ->（-1/2π -60°） 逆时针的圆 DD′圆
    UIBezierPath *path2 = [UIBezierPath bezierPathWithArcCenter:CGPointMake(self.center.x,kCenterY)
                                                        radius:Raduis
                                                    startAngle:M_PI *3/2 - (M_PI_2 -angle)
                                                      endAngle:-M_PI_2 - (M_PI_2 -angle)
                                                     clockwise:NO];
    

    [path appendPath:path2];

    _changedLayer.path = path.CGPath;

Path路径有了，接着实现动画效果。
圆弧的长度逐渐变长。我们还是使用经典的strokeStart和strokeEnd。但是圆弧是如何变长的呢？

(1) 初始圆弧有一段长度。
(2) 在原始长度的基础上逐渐变长，逐渐远离A点，同时要在D点停止。
(3) 长度逐渐变长，最终要在D与D′点交汇。

我们分别解决这个三个问题。

第一个问题，strokeEnd - strokeStart > 0这样能保证有一段圆弧。

第二个问题，逐渐变长,意味着strokeEnd值不断变大。远离A点意味着strokeStart的值不断变大。在D点停止，说明了strokeStart有上限值。

第三个问题，意味着strokeEnd值不断变大，最终值为1.0。

这三个问题说明了一个问题，strokeEnd和strokeStart是一组变化的数据。

那么core animation 中可以控制一组值的动画是关键帧动画（CAKeyframeAnimation）。

为了更准确的给出strokeEnd和strokeStart值，我们使用长度比来确定。

假设我们初始的长度就是曲线ABC的长度。但是贝塞尔曲线长度怎么计算？使用下面方法:

//求贝塞尔曲线长度
-(CGFloat) bezierCurveLengthFromStartPoint:(CGPoint)start toEndPoint:(CGPoint) end withControlPoint:(CGPoint) control
{
    const int kSubdivisions = 50;
    const float step = 1.0f/(float)kSubdivisions;
    
    float totalLength = 0.0f;
    CGPoint prevPoint = start;
    
    // starting from i = 1, since for i = 0 calulated point is equal to start point
    for (int i = 1; i <= kSubdivisions; i++)
    {
        float t = i*step;
        
        float x = (1.0 - t)*(1.0 - t)*start.x + 2.0*(1.0 - t)*t*control.x + t*t*end.x;
        float y = (1.0 - t)*(1.0 - t)*start.y + 2.0*(1.0 - t)*t*control.y + t*t*end.y;
        
        CGPoint diff = CGPointMake(x - prevPoint.x, y - prevPoint.y);
        
        totalLength += sqrtf(diff.x*diff.x + diff.y*diff.y); // Pythagorean
        
        prevPoint = CGPointMake(x, y);
    }
    
    return totalLength;
}

计算贝塞尔曲线所在的比例为：

CGFloat orignPercent = [self calculateCurveLength]/[self calculateTotalLength];

初始的strokeStart = 0、strokeEnd = orignPercent。
最终的stokeStart = ？

//结果就是贝塞尔曲线长度加上120°圆弧的长度与总长度相比得到的结果。
CGFloat endPercent =([self calculateCurveLength] + Radians(120) *Raduis ) / [self calculateTotalLength];

实现动画的代码为

    CGFloat orignPercent = [self calculateCurveLength] / [self calculateTotalLength];
    CGFloat endPercent =([self calculateCurveLength] + Radians(120) *Raduis ) / [self calculateTotalLength];
    
    _changedLayer.strokeStart = endPercent;
    
    //方案1
    CAKeyframeAnimation *startAnimation = [CAKeyframeAnimation animationWithKeyPath:@"strokeStart"];
    startAnimation.values = @[@0.0,@(endPercent)];
    
    CAKeyframeAnimation *EndAnimation = [CAKeyframeAnimation animationWithKeyPath:@"strokeEnd"];
    EndAnimation.values = @[@(orignPercent),@1.0];
    
    
    CAAnimationGroup *animationGroup = [CAAnimationGroup animation];
    animationGroup.animations = [NSArray arrayWithObjects:startAnimation,EndAnimation, nil];
    animationGroup.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
    animationGroup.duration = kStep3Duration;
    animationGroup.delegate = self;
    animationGroup.removedOnCompletion = YES;
    [animationGroup setValue:@"animationStep3" forKey:@"animationName"];
    [_changedLayer addAnimation:animationGroup forKey:nil];

效果图为：

step3-1 Animation.gif

2.上下横线的动画效果。

此动画效果，需要使用transform.rotation.z转动角度。

上横线转动的角度顺序为 0 -> 10° -> (-55°) -> (-45°)
这是一组数据，使用关键帧处理动画。

    CAKeyframeAnimation *rotationAnimation1 = [CAKeyframeAnimation animationWithKeyPath:@"transform.rotation.z"];
    rotationAnimation1.values = @[[NSNumber numberWithFloat:0],
                                 [NSNumber numberWithFloat:Radians(10) ],
                                 [NSNumber numberWithFloat:Radians(-10) - M_PI_4 ],
                                 [NSNumber numberWithFloat:- M_PI_4 ]
                                 ];

下横线转动的角度顺序为0 -> (-10°) -> (55°) -> (45°)

    CAKeyframeAnimation *rotationAnimation2 = [CAKeyframeAnimation animationWithKeyPath:@"transform.rotation.z"];
    rotationAnimation2.values = @[[NSNumber numberWithFloat:0],
                                 [NSNumber numberWithFloat:Radians(-10) ],
                                 [NSNumber numberWithFloat:Radians(10)  + M_PI_4 ],
                                 [NSNumber numberWithFloat: M_PI_4 ]
                                 ];

你认为这么就结束了? 最终结束的动画如下：

step3-2 finished Animation.jpg

发现相交的直线没有居中，而是靠左显示。

向左平移，使用transform.translation.x

    //平移量
    CGFloat toValue = lineWidth *(1- cos(M_PI_4)) /2.0;

即旋转角度又发生偏移量，使用组合动画。

上横线组合动画

     //平移x
    CABasicAnimation *translationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.translation.x"];
    translationAnimation.fromValue = [NSNumber numberWithFloat:0];
    translationAnimation.toValue = [NSNumber numberWithFloat:-toValue];
    
    //角度关键帧 上横线的关键帧 0 - 10° - (-55°) - (-45°)
    CAKeyframeAnimation *rotationAnimation1 = [CAKeyframeAnimation animationWithKeyPath:@"transform.rotation.z"];
    rotationAnimation1.values = @[[NSNumber numberWithFloat:0],
                                 [NSNumber numberWithFloat:Radians(10) ],
                                 [NSNumber numberWithFloat:Radians(-10) - M_PI_4 ],
                                 [NSNumber numberWithFloat:- M_PI_4 ]
                                 ];
  
    
    CAAnimationGroup *transformGroup1 = [CAAnimationGroup animation];
    transformGroup1.animations = [NSArray arrayWithObjects:rotationAnimation1,translationAnimation, nil];
    transformGroup1.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
    transformGroup1.duration = kStep3Duration;
    transformGroup1.removedOnCompletion = YES;
    [_topLineLayer addAnimation:transformGroup1 forKey:nil];

下横线组合动画

    //角度关键帧 下横线的关键帧 0 - （-10°） - (55°) - (45°)
    CAKeyframeAnimation *rotationAnimation2 = [CAKeyframeAnimation animationWithKeyPath:@"transform.rotation.z"];
    rotationAnimation2.values = @[[NSNumber numberWithFloat:0],
                                 [NSNumber numberWithFloat:Radians(-10) ],
                                 [NSNumber numberWithFloat:Radians(10) + M_PI_4 ],
                                 [NSNumber numberWithFloat: M_PI_4 ]
                                 ];
    

    CAAnimationGroup *transformGroup2 = [CAAnimationGroup animation];
    transformGroup2.animations = [NSArray arrayWithObjects:rotationAnimation2,translationAnimation, nil];
    transformGroup2.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
    transformGroup2.duration = kStep3Duration ;
    transformGroup2.delegate = self;
    transformGroup2.removedOnCompletion = YES;
    [_bottomLineLayer addAnimation:transformGroup2 forKey:nil];

Part1到此结束。最终效果图

Part1 animation.gif

Part2的思路和Part1思路是一样的。你可以参考代码自己思考一下。核心代码

-(void)cancelAnimation
{
    //最关键是path路径
   
    UIBezierPath *path = [UIBezierPath bezierPath];
    //30度,经过反复测试，效果最好
    CGFloat angle = Radians(30);
    
    CGFloat startPointX = self.center.x + Raduis * cos(angle);
    CGFloat startPointY = kCenterY - Raduis * sin(angle);
    
    CGFloat controlPointX = self.center.x + Raduis *acos(angle);
    CGFloat controlPointY = kCenterY;
    
    CGFloat endPointX = self.center.x + lineWidth /2;
    CGFloat endPointY = kCenterY;
    
    //组合path 路径 起点 -150° 顺时针的圆
    path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(self.center.x,kCenterY)
                                                         radius:Raduis
                                                     startAngle:-M_PI + angle
                                                       endAngle:M_PI + angle
                                                      clockwise:YES];
    
    
    
    //起点为 180°-> (360°-30°)
    UIBezierPath *path1 = [UIBezierPath bezierPathWithArcCenter:CGPointMake(self.center.x,kCenterY)
                                                         radius:Raduis
                                                     startAngle:M_PI + angle
                                                       endAngle:2 * M_PI - angle
                                                      clockwise:YES];
    [path appendPath:path1];

    //三点曲线
    UIBezierPath *path2 = [UIBezierPath bezierPath];

    [path2 moveToPoint:CGPointMake(startPointX, startPointY)];
    
    [path2 addCurveToPoint:CGPointMake(endPointX,endPointY)
             controlPoint1:CGPointMake(startPointX, startPointY)
             controlPoint2:CGPointMake(controlPointX, controlPointY)];
    
    [path appendPath:path2];
    
    //比原始状态向左偏移5个像素
    UIBezierPath *path3 = [UIBezierPath bezierPath];
    [path3 moveToPoint:CGPointMake(endPointX,endPointY)];
    [path3 addLineToPoint:CGPointMake(self.center.x - lineWidth/2 -5,endPointY)];
    [path appendPath:path3];
    
    _changedLayer.path = path.CGPath;
    
    //平移量
    CGFloat toValue = lineWidth *(1- cos(M_PI_4)) /2.0;
    //finished 最终状态
    CGAffineTransform transform1 = CGAffineTransformMakeRotation(0);
    CGAffineTransform transform2 = CGAffineTransformMakeTranslation(0, 0);
    CGAffineTransform transform3 = CGAffineTransformMakeRotation(0);
    
    CGAffineTransform transform = CGAffineTransformConcat(transform1, transform2);
    _topLineLayer.affineTransform = transform;
    transform = CGAffineTransformConcat(transform3, transform2);
    _bottomLineLayer.affineTransform = transform;
    
    //一个圆的长度比
    CGFloat endPercent = 2* M_PI *Raduis / ([self calculateTotalLength] + lineWidth);

    
    //横线占总path的百分比
    CGFloat percent = lineWidth / ([self calculateTotalLength] + lineWidth);
    
    _changedLayer.strokeStart = 1.0 -percent;
    
    CAKeyframeAnimation *startAnimation = [CAKeyframeAnimation animationWithKeyPath:@"strokeStart"];
    startAnimation.values = @[@0.0,@0.3,@(1.0 -percent)];
    
    //在π+ angle
    CAKeyframeAnimation *EndAnimation = [CAKeyframeAnimation animationWithKeyPath:@"strokeEnd"];
    EndAnimation.values = @[@(endPercent),@(endPercent),@1.0];
    
    
    CAAnimationGroup *animationGroup = [CAAnimationGroup animation];
    animationGroup.animations = [NSArray arrayWithObjects:startAnimation,EndAnimation, nil];
    animationGroup.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    animationGroup.duration = kStep4Duration;
    animationGroup.delegate = self;
    animationGroup.removedOnCompletion = YES;
    [animationGroup setValue:@"animationStep4" forKey:@"animationName"];
    [_changedLayer addAnimation:animationGroup forKey:nil];
    
    //平移x
    CABasicAnimation *translationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.translation.x"];
    translationAnimation.fromValue = [NSNumber numberWithFloat:-toValue];
    translationAnimation.toValue = [NSNumber numberWithFloat:0];
    
    //角度关键帧 上横线的关键帧  (-45°) -> (-55°)-> 10° -> 0
    CAKeyframeAnimation *rotationAnimation1 = [CAKeyframeAnimation animationWithKeyPath:@"transform.rotation.z"];
    rotationAnimation1.values = @[[NSNumber numberWithFloat:- M_PI_4 ],
                                  [NSNumber numberWithFloat:- Radians(10) - M_PI_4 ],
                                  [NSNumber numberWithFloat:Radians(10) ],
                                  [NSNumber numberWithFloat:0]
                                  ];
    

    CAAnimationGroup *transformGroup1 = [CAAnimationGroup animation];
    transformGroup1.animations = [NSArray arrayWithObjects:rotationAnimation1,translationAnimation, nil];
    transformGroup1.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
    transformGroup1.duration = kStep4Duration;
    transformGroup1.removedOnCompletion = YES;
    [_topLineLayer addAnimation:transformGroup1 forKey:nil];
    
    //角度关键帧 下横线的关键帧  (45°)-> (55°)- >（-10°）-> 0
    CAKeyframeAnimation *rotationAnimation2 = [CAKeyframeAnimation animationWithKeyPath:@"transform.rotation.z"];
    rotationAnimation2.values = @[[NSNumber numberWithFloat: M_PI_4 ],
                                  [NSNumber numberWithFloat:Radians(10) + M_PI_4 ],
                                  [NSNumber numberWithFloat:-Radians(10) ],
                                  [NSNumber numberWithFloat:0]
                                  ];

    CAAnimationGroup *transformGroup2 = [CAAnimationGroup animation];
    transformGroup2.animations = [NSArray arrayWithObjects:rotationAnimation2,translationAnimation, nil];
    transformGroup2.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
    transformGroup2.duration = kStep4Duration;
    transformGroup2.delegate = self;
    transformGroup2.removedOnCompletion = YES;
    [_bottomLineLayer addAnimation:transformGroup2 forKey:nil];
    
}

最终效果图：

finished animation.gif

本篇文章讲解结束！

代码点此链接下载：https://github.com/WZF-Fei/ZFChangeAnimation

网友评论

699f3408aaa8:https://github.com/imzyf/99-projects-of-swift/tree/master/007-meun-button-animation

Swift 4 版的实现
1dbdc3054b28:厉害，膜拜
春泥Fu:给力了，不得不赞！
太二道士:先赞一个
//平移x
CABasicAnimation *translationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.translation.x"];
使用这个做的动画效果和楼主做的效果不太一样啊，为何呢？我用的是swift写的
我把这个keyPath改成了“position” 可以做成相应的效果，
请楼主指教一下
22ee0fa80171:楼主，那个计算贝塞尔曲线长度的原理是什么？微积分吗？
Airfei:嗯，是的
zhiyi:楼主怎么控制layer绕z轴旋转的中心点？是在画横线的时候让横线最右边点画在layer的中心吗
Airfei:@zhiyi 可以根据锚点进行设置，这篇文章上layer实际上是从右边作为起点。
暴走的码农:很强大
小狄爱玩雪:很棒，我也需要学习了。
Airfei:@小泥吧共同学习！
Leven_W:谢谢分享
25357a229149:牛逼！
十一岁的加重:真是好东西啊！！！
花前月下:不错。感谢分享。超赞
PPAbner:看了你的这个动画，我决定了，有空我真的要开始认真研究研究动画啦！！！楼主很给力！！！超赞！！
Airfei:@beibeihenmei 共同学习！
曾樑:这个赞的
c1bf90f7e48b:请收下膝盖
L4x: 啪啪啪啪啪