一、计算动画开始结束点位置
方法：
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- (cgpoint)convertpoint:(cgpoint)point toview:(nullable uiview *)view;
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1） 动画开始位置fromcenter
复制代码 代码如下:
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
复制代码 代码如下:
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
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cgpoint controlpoint1 = cgpointmake(controlpointcx - controlpointex, controlpointcy - controlpointey);
cgpoint controlpoint2 = cgpointmake(controlpointcx + controlpointex, controlpointcy - controlpointey);
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三、复制动画的layer
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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];
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四、动画组合
1）运动轨迹（抛物线）
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uibezierpath *path = [uibezierpath bezierpath];
[path movetopoint:fromcenter];
[path addcurvetopoint:endcenter controlpoint1:controlpoint1 controlpoint2:controlpoint2];
cakeyframeanimation *pathanimation = [cakeyframeanimation animationwithkeypath:@"position"];
pathanimation.path = path.cgpath;
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2）旋转起来
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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]
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3）缩放动画
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cabasicanimation *scaleanimation = [cabasicanimation animationwithkeypath:@"transform.scale"];
scaleanimation.removedoncompletion = no;
scaleanimation.fromvalue = [nsnumber numberwithfloat:1.0];
scaleanimation.tovalue = [nsnumber numberwithfloat:0.2];
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4）透明度动画
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cabasicanimation *alphaanimation = [cabasicanimation animationwithkeypath:@"opacity"];
alphaanimation.removedoncompletion = no;
alphaanimation.fromvalue = [nsnumber numberwithfloat:1.0];
alphaanimation.tovalue = [nsnumber numberwithfloat:0.1];
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5）动画组合
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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"];
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动画效果：
下载地址：shoppingcartanimation.rar
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://www.jianshu.com/p/a99e58e5dc19