iOS添加购物车动画效果示例

一、计算动画开始结束点位置

方法：

- (cgpoint)convertpoint:(cgpoint)point toview:(nullable uiview *)view;

1） 动画开始位置fromcenter

cgpoint fromcenter =  [animationview convertpoint:cgpointmake(animationview.frame.size.width * 0.5f, animationview.frame.size.height * 0.5f) toview:keywindow];

2）动画结束位置endcenter

cgpoint endcenter = [endview convertpoint:cgpointmake(endview.frame.size.width * 0.5f, endview.frame.size.height * 0.5f) toview:keywindow];

二、计算贝塞尔曲线（抛物线）的两个控制点

• controlpoint1是控制点1
• controlpoint2是控制点2
• a是controlpoint1和controlpoint2的中点
• controlpointc是fromcenter和b的中点

1）先设置控制点距最高点（fromcenter或endcenter）的水平距离controlpointey，本篇默认controlpointey = 100，即图1中点controlpointc到点a的距离。

2）计算控制点相对于点a的距离controlpointex，即controlpoint1到a距离或controlpoint2到a距离，本篇设置为fromcenter.x到endcenter.x的1/4，即controlpointex = (endcenter.x - fromcenter.x) * 0.25f;

3）计算两个控制点

cgpoint controlpoint1 = cgpointmake(controlpointcx - controlpointex, controlpointcy - controlpointey);
cgpoint controlpoint2 = cgpointmake(controlpointcx + controlpointex, controlpointcy - controlpointey);

三、复制动画的layer

nsstring *str = ((uibutton *)animationview).titlelabel.text;
_animationlayer = [catextlayer layer];
_animationlayer.bounds = animationview.bounds;
_animationlayer.position = fromcenter;
_animationlayer.alignmentmode = kcaalignmentcenter;//文字对齐方式
_animationlayer.wrapped = yes;
_animationlayer.contentsscale = [uiscreen mainscreen].scale;
_animationlayer.string = str;
_animationlayer.backgroundcolor = [uicolor redcolor].cgcolor;
[keywindow.layer addsublayer:_animationlayer];

四、动画组合

1）运动轨迹（抛物线）

uibezierpath *path = [uibezierpath bezierpath];
[path movetopoint:fromcenter];
[path addcurvetopoint:endcenter controlpoint1:controlpoint1 controlpoint2:controlpoint2];
cakeyframeanimation *pathanimation = [cakeyframeanimation animationwithkeypath:@"position"];
pathanimation.path = path.cgpath;

2）旋转起来

cabasicanimation *rotateanimation = [cabasicanimation animationwithkeypath:@"transform.rotation"];
rotateanimation.removedoncompletion = yes;
rotateanimation.fromvalue = [nsnumber numberwithfloat:0];
rotateanimation.tovalue = [nsnumber numberwithfloat:10 * m_pi];
rotateanimation.timingfunction=[camediatimingfunction functionwithname:kcamediatimingfunctioneasein]

3）缩放动画

cabasicanimation *scaleanimation = [cabasicanimation animationwithkeypath:@"transform.scale"];
scaleanimation.removedoncompletion = no;
scaleanimation.fromvalue = [nsnumber numberwithfloat:1.0];
scaleanimation.tovalue = [nsnumber numberwithfloat:0.2];

4）透明度动画

cabasicanimation *alphaanimation = [cabasicanimation animationwithkeypath:@"opacity"];
alphaanimation.removedoncompletion = no;
alphaanimation.fromvalue = [nsnumber numberwithfloat:1.0];
alphaanimation.tovalue = [nsnumber numberwithfloat:0.1];

5）动画组合

caanimationgroup *groups = [caanimationgroup animation];
groups.animations = @[pathanimation,rotateanimation, scaleanimation, alphaanimation];
groups.duration = kshoppingcartduration;
groups.removedoncompletion=no;
groups.fillmode=kcafillmodeforwards;
groups.delegate = self;
[_animationlayer addanimation:groups forkey:@"group"];

动画效果：

下载地址：shoppingcartanimation_jb51.rar

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