<h2>概述</h2> <p>前段时间帮某某做了一个动画效果，今天分享给大家。关于动画的基础知识，这里不会细说，如果您还没有核心动画的基础知识，请先阅读相关文章，了解核心动画如何使用，然后再继续阅读本篇文章。</p> <p>本篇文章，涉及到以下知识点：</p> <ul> <li>如何添加缩放动画</li> <li>如何添加平移动画</li> <li>如何添加旋转动画</li> <li>如何添加关键帧动画</li> <li>如何使用组合动画</li> <li>如何实现渐变图层</li> <li>如何实现圆形渐变进度条</li> </ul> <p>温馨提示：新手不适合阅读本篇文章哦，不过可以初步阅读了解一下！</p> <p>如果没有了解过动画的基础知识，可先看看笔者之前的一些文章：</p> <ol> <li><a href="/misc/goto?guid=4959673740530142910" rel="nofollow,noindex">CALayer精讲</a></li> <li><a href="/misc/goto?guid=4959673740614489281" rel="nofollow,noindex">UIBezierPath精讲</a></li> <li><a href="/misc/goto?guid=4959673740701658898" rel="nofollow,noindex">iOS CAShapeLayer精讲</a></li> <li><a href="/misc/goto?guid=4959673740777692695" rel="nofollow,noindex">CAAnimation解读</a></li> <li><a href="/misc/goto?guid=4959673740847291905" rel="nofollow,noindex">CABasicAnimation精讲</a></li> </ol> <p>本篇文章不深入讲基础知识，只讲如何实现及实现的要点，并放出关键代码。对于伸手党，请不要私聊我要完整的源代码。如果您正好在项目中有这样的需求，可以尝试根据本篇文章讲解动手做一个！</p> <h2>最终效果图</h2> <ol> <li>无缩放动画的效果图：</li> </ol> <p><img src="https://simg.open-open.com/show/26cf2b990a083665d72abdaeaed0fbf8.gif"></p> <p>从动画效果可以看出来，有平移、旋转、关键帧动画，同时还有渐变进度条充满的动画。另外还要注意移动的距离。请忽略样式丑陋的问题~</p> <ol> <li>有缩放动画的效果图：</li> </ol> <p><img src="https://simg.open-open.com/show/fcbe952ef37b597604d0973142d026b2.gif"></p> <p>从动画效果可以看出来，个人变成了6个，且是平分的，比上面的效果图多了缩放的动画！这个缩放动画，生成GIF图的效果真丑，跟手机运行起来看到的差别比较大！</p> <h2>设计思路</h2> <p>这里是封装里了通用的组件，如果是在项目中使用，可以轻松调用且可以复用。从动画效果可以看到，这个整体是由以下几个部分组成的：</p> <ol> <li>中间带进度图的圆形控件（这里叫叶子吧）</li> <li>从中心圆出来到四周的N个控件，其中每个都是拥有同样的特性的</li> </ol> <p>所以，我们设计成三个类，分别是：</p> <ul> <li>HYBCurveItemView：代表散开的每个子项控件</li> <li>HYBCurveMainView：代表中间的圆形控件</li> <li>HYBCurveMenuView：由前两个控件组合而形成的整体控件</li> </ul> <h2>设计HYBCurveItemView</h2> <p>假设叫叶子。那么每个叶子就有相同的特性，需要知道自己的归属：</p> <ul> <li>自身的大小</li> <li>展示的元素</li> <li>可移动到最远的哪个位置</li> <li>可移动到最近的哪个位置</li> <li>起始位置</li> <li>最终展开后停留的位置</li> </ul> <p>可设置以下几个位置属性：</p> <pre> <code class="language-objectivec">  @property (nonatomic, assign) CGPoint startPoint; @property (nonatomic, assign) CGPoint endPoint; @property (nonatomic, assign) CGPoint nearPoint; @property (nonatomic, assign) CGPoint farPoint;   </code></pre> <p>这个类只需要有相关属性即可！</p> <h2>设计HYBCurveMainView</h2> <p>假设中大圆。大圆主要需要属性以下特性：</p> <ul> <li>自身大小</li> <li>展示的元素</li> <li>带有渐变圆形进度条</li> </ul> <p>可执行的操作：</p> <ul> <li>更新进度</li> <li>展开、收起叶子</li> </ul> <p>对于这个大圆类，细读如何添加圆形进度条。</p> <h2>设计渐变进度圆环</h2> <h3>首先，添加白色固定圆形</h3> <p>底部是一个白色的圆环，当白色圆环填满时，表示0%。那么白色圆环可以用什么来实现呢？其实CAShapeLayer就是非常好的，它可以添加圆形路径来实现的，记得设置填充色为透明哦，不然连中间的内容也看不见了。代码如下：</p> <pre> <code class="language-objectivec">  self.outLayer = [CAShapeLayer layer]; CGRect rect = {kLineWidth / 2, kLineWidth / 2, frame.size.width - kLineWidth, frame.size.height - kLineWidth}; UIBezierPath *path = [UIBezierPathbezierPathWithOvalInRect:rect]; self.outLayer.strokeColor = [UIColor whiteColor].CGColor; self.outLayer.lineWidth = kLineWidth; self.outLayer.fillColor =  [UIColor clearColor].CGColor; self.outLayer.lineCap = kCALineCapRound; self.outLayer.path = path.CGPath; [self.layeraddSublayer:self.outLayer];   </code></pre> <p>因为要设置为白色圆环，所以画笔颜色设置为白色，线宽就设置为圆环的大小。这样就可以初步形成了带有白色圆环的底色了。此时就是0%。</p> <h3>其次，设置可调进度的进度圆环图层</h3> <p>下面所创建的图层，会用于设置渐变颜色图层的mask，这样才能显示中间的内容，而不是渐变的图层。它的大小与白底圆环一样大小：</p> <pre> <code class="language-objectivec">  self.progressLayer = [CAShapeLayer layer]; self.progressLayer.frame = self.bounds; self.progressLayer.fillColor = [UIColor clearColor].CGColor; self.progressLayer.strokeColor = [UIColor whiteColor].CGColor; self.progressLayer.lineWidth = kLineWidth; self.progressLayer.lineCap = kCALineCapRound; self.progressLayer.path = path.CGPath;   </code></pre> <h3>然后，增加渐变图层</h3> <p>要实现渐变图层，可以通过CAGradientLayer来创建，这里的颜色是随意指定的，所以效果不太协调，大家可自由调整。这里呢使用了两个渐变图层，然后放到一个大的渐变图层中，两个小的图层各占一半。 当添加了mask后，就只有进度这一部分渐变可显示了。</p> <pre> <code class="language-objectivec">  CAGradientLayer *gradientLayer1 =  [CAGradientLayer layer]; gradientLayer1.frame = CGRectMake(0, 0, width / 2, height); CGColorRef red = [UIColor redColor].CGColor; CGColorRef purple = [UIColor purpleColor].CGColor; CGColorRef yellow = [UIColor yellowColor].CGColor; CGColorRef orange = [UIColor orangeColor].CGColor; [gradientLayer1setColors:@[(__bridgeid)red, (__bridgeid)purple, (__bridgeid)yellow, (__bridgeid)orange]]; [gradientLayer1setLocations:@[@0.3, @0.6, @0.8, @1.0]]; [gradientLayer1setStartPoint:CGPointMake(0.5, 1)]; [gradientLayer1setEndPoint:CGPointMake(0.5, 0)];      CAGradientLayer *gradientLayer2 =  [CAGradientLayer layer]; gradientLayer2.frame = CGRectMake(width / 2, 0, width / 2, height); CGColorRef blue = [UIColor brownColor].CGColor; CGColorRef purple1 = [UIColor purpleColor].CGColor; CGColorRef r1 = [UIColor yellowColor].CGColor; CGColorRef o1 = [UIColor orangeColor].CGColor; [gradientLayer2setColors:@[(__bridgeid)blue, (__bridgeid)purple1, (__bridgeid)r1, (__bridgeid)o1]]; [gradientLayer2setLocations:@[@0.3, @0.6, @0.8, @1.0]]; [gradientLayer2setStartPoint:CGPointMake(0.5, 0)]; [gradientLayer2setEndPoint:CGPointMake(0.5, 1)];   CAGradientLayer *gradientLayer = [CAGradientLayer layer]; gradientLayer.frame = self.bounds; [gradientLayeraddSublayer:gradientLayer1]; [gradientLayer1addSublayer:gradientLayer2]; gradientLayer.mask = self.progressLayer; [self.layeraddSublayer:gradientLayer];   </code></pre> <p>注意，一定要设置gradientLayer.mask = self.progressLayer;这样才能显示中间的内容，如果不设置mask，那么就只有渐变图层了。</p> <h3>最后，动画更新进度</h3> <p>在需要更新进度的时候，可以调用这个API来更新进度，带有动画效果。</p> <pre> <code class="language-objectivec">  - (void)updateProgressWithNumber:(NSUInteger)number {   [CATransaction begin];   [CATransactionsetAnimationTimingFunction:[CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionEaseIn]];   [CATransactionsetAnimationDuration:0.5];   self.progressLayer.strokeEnd =  number / 100.0;   self.percentLabel.text = [NSStringstringWithFormat:@"%@%%", @(number)];   [CATransaction commit]; }   </code></pre> <h2>设计HYBCurveMenuView</h2> <p>这个类就是圆形菜单类了，整合前两个。它主要具备以下特性：</p> <ul> <li>自身大小</li> <li>是否添加缩放动画</li> <li>更换叶子</li> </ul> <p>可执行的操作：</p> <ul> <li>展开、收起</li> <li>点击大圆回调</li> </ul> <h2>更换叶子</h2> <p>当更换所有的叶子时，需要调整所有叶子的位置：</p> <pre> <code class="language-objectivec">  - (void)setMenuItems:(NSArray *)menuItems {   if (_menuItems != menuItems) {     _menuItems = menuItems;          for (UIView *v in self.subviews) {       if (v.tag >= 1000) {         [v removeFromSuperview];       }     }          // add the menu buttons     int count = (int)[menuItemscount];     CGFloat cnt = 1;     for (int i = 0; i < count; i ++) {       HYBCurveItemView *item = [menuItemsobjectAtIndex:i];       item.tag = 1000 + i;       item.startPoint = self.startPoint;       CGFloat pi =  M_PI / count;       CGFloat endRadius = item.bounds.size.width / 2 + self.endDistance + _mainView.bounds.size.width / 2;       CGFloat nearRadius = item.bounds.size.width / 2 + self.nearDistance + _mainView.bounds.size.width / 2;       CGFloat farRadius = item.bounds.size.width / 2 + self.farDistance + _mainView.bounds.size.width / 2;       item.endPoint = CGPointMake(self.startPoint.x + endRadius* sinf(pi* cnt),                                   self.startPoint.y - endRadius* cosf(pi* cnt));       item.nearPoint = CGPointMake(self.startPoint.x + nearRadius* sinf(pi* cnt),                                   self.startPoint.y - nearRadius* cosf(pi* cnt));       item.farPoint = CGPointMake(self.startPoint.x + farRadius* sinf(pi* cnt),                                   self.startPoint.y - farRadius* cosf(pi* cnt));       item.center = item.startPoint;       [selfaddSubview:item];              cnt += 2;     }          [selfbringSubviewToFront:_mainView];   } }   </code></pre> <p>其中，这几个属性带有默认值（分别表示起点、最近点、最远点、展开后最终停留点）：</p> <pre> <code class="language-objectivec">  self.startPoint = self.center; // 修改这时的参数来调整大圆与圆之间的距离 self.nearDistance = 30; self.farDistance = 60; self.endDistance = 30;   </code></pre> <p>对于上面的点的计算，主要是一点点的数学知识，需要懂得象限与角度的关系。</p> <h2>展开或者收起</h2> <p>调用下面的方法来展开或者收起。这里会遍历所有的叶子，让每个叶子都添加对应的动画变换，就可以看到动画轨迹了：</p> <pre> <code class="language-objectivec">  - (void)expend:(BOOL)isExpend {   _isExpend = isExpend;      [self.menuItemsenumerateObjectsUsingBlock:^(HYBCurveItemView *obj, NSUInteger idx, BOOL * _Nonnullstop) {     if (self.scale) {       if (isExpend) {         obj.transform = CGAffineTransformIdentity;       } else {         obj.transform = CGAffineTransformMakeScale(0.001, 0.001);       }     }          [selfaddRotateAndPostisionForItem:objtoShow:isExpend];   }]; }   </code></pre> <p>接下来是最关键的动画核心代码：</p> <pre> <code class="language-objectivec">  - (void)addRotateAndPostisionForItem:(HYBCurveItemView *)itemtoShow:(BOOL)show {   if (show) {     CABasicAnimation *scaleAnimation = nil;     if (self.scale) {       scaleAnimation = [CABasicAnimationanimationWithKeyPath:@"transform.scale"];       scaleAnimation.fromValue = [NSNumbernumberWithFloat:0.2];       scaleAnimation.toValue = [NSNumbernumberWithFloat:1.0];       scaleAnimation.duration = 0.5f;       scaleAnimation.timingFunction = [CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionEaseInEaseOut];     }          CAKeyframeAnimation *rotateAnimation = [CAKeyframeAnimationanimationWithKeyPath:@"transform.rotation.z"];     rotateAnimation.values = @[@(M_PI), @(0.0)];     rotateAnimation.duration = 0.5f;     rotateAnimation.keyTimes = @[@(0.3), @(0.4)];          CAKeyframeAnimation *positionAnimation = [CAKeyframeAnimationanimationWithKeyPath:@"position"];     positionAnimation.duration = 0.5f;     CGMutablePathRef path = CGPathCreateMutable();     CGPathMoveToPoint(path, NULL, item.startPoint.x, item.startPoint.y);     CGPathAddLineToPoint(path, NULL, item.farPoint.x, item.farPoint.y);     CGPathAddLineToPoint(path, NULL, item.nearPoint.x, item.nearPoint.y);     CGPathAddLineToPoint(path, NULL, item.endPoint.x, item.endPoint.y);     positionAnimation.path = path;     CGPathRelease(path);          CAAnimationGroup *animationgroup = [CAAnimationGroup animation];     if (self.scale) {       animationgroup.animations = @[scaleAnimation, positionAnimation, rotateAnimation];     } else {       animationgroup.animations = @[positionAnimation, rotateAnimation];     }     animationgroup.duration = 0.5f;     animationgroup.fillMode = kCAFillModeForwards;     animationgroup.timingFunction = [CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionEaseIn];     [item.layeraddAnimation:animationgroupforKey:@"Expand"];     item.center = item.endPoint;   } else {     CABasicAnimation *scaleAnimation = nil;     if (self.scale) {       scaleAnimation = [CABasicAnimationanimationWithKeyPath:@"transform.scale"];       scaleAnimation.fromValue = [NSNumbernumberWithFloat:1.0];       scaleAnimation.toValue = [NSNumbernumberWithFloat:0.2];       scaleAnimation.duration = 0.5f;       scaleAnimation.timingFunction = [CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionEaseInEaseOut];     }          CAKeyframeAnimation *rotateAnimation = [CAKeyframeAnimationanimationWithKeyPath:@"transform.rotation.z"];     rotateAnimation.values = @[@0, @(M_PI * 2), @(0)];     rotateAnimation.duration = 0.5f;     rotateAnimation.keyTimes = @[@0, @(0.4), @(0.5)];     CAKeyframeAnimation *positionAnimation = [CAKeyframeAnimationanimationWithKeyPath:@"position"];     positionAnimation.duration = 0.5f;     CGMutablePathRef path = CGPathCreateMutable();     CGPathMoveToPoint(path, NULL, item.endPoint.x, item.endPoint.y);     CGPathAddLineToPoint(path, NULL, item.farPoint.x, item.farPoint.y);     CGPathAddLineToPoint(path, NULL, item.startPoint.x, item.startPoint.y);     positionAnimation.path = path;     CGPathRelease(path);          CAAnimationGroup *animationgroup = [CAAnimationGroup animation];     if (self.scale) {       animationgroup.animations = @[scaleAnimation, positionAnimation, rotateAnimation];     } else {       animationgroup.animations = @[positionAnimation, rotateAnimation];     }          animationgroup.duration = 0.5f;     animationgroup.fillMode = kCAFillModeForwards;     animationgroup.timingFunction = [CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionEaseIn];     [item.layeraddAnimation:animationgroupforKey:@"Close"];     item.center = item.startPoint;   } }   </code></pre> <h3>讲讲展开缩放动画</h3> <p>展开时缩放动画可以通过修改transform.scale来实现，这是x、y方向都缩放了。也就是在刚出来时，缩放不断变大到最终大小。</p> <pre> <code class="language-objectivec">  scaleAnimation = [CABasicAnimationanimationWithKeyPath:@"transform.scale"]; scaleAnimation.fromValue = [NSNumbernumberWithFloat:0.2]; scaleAnimation.toValue = [NSNumbernumberWithFloat:1.0];   </code></pre> <h3>讲讲展开旋转动画</h3> <p>我们旋转的是z轴，而不是x、y轴，通过transform.rotation.z来实现。这里使用的是关键帧来实现，其中设置values及keyTimes的个数是对应的：</p> <pre> <code class="language-objectivec">  CAKeyframeAnimation *rotateAnimation = [CAKeyframeAnimationanimationWithKeyPath:@"transform.rotation.z"]; rotateAnimation.values = @[@(M_PI), @(0.0)]; rotateAnimation.duration = 0.5f; rotateAnimation.keyTimes = @[@(0.3), @(0.4)];   </code></pre> <h3>讲讲展开移动动画</h3> <p>通过position可以实现平移动画，这里也是使用关键帧来实现，因为需要到path。通过添加路径，来实现起点、最近、最远、最终停留的路径：</p> <pre> <code class="language-objectivec">  CAKeyframeAnimation *positionAnimation = [CAKeyframeAnimationanimationWithKeyPath:@"position"]; positionAnimation.duration = 0.5f; CGMutablePathRef path = CGPathCreateMutable(); CGPathMoveToPoint(path, NULL, item.startPoint.x, item.startPoint.y); CGPathAddLineToPoint(path, NULL, item.farPoint.x, item.farPoint.y); CGPathAddLineToPoint(path, NULL, item.nearPoint.x, item.nearPoint.y); CGPathAddLineToPoint(path, NULL, item.endPoint.x, item.endPoint.y); positionAnimation.path = path; CGPathRelease(path);   </code></pre> <h3>讲讲展开组合动画</h3> <p>上面创建了好几种动画，那么要实现组合，就需要通过CAAnimationGroup来实现了。然后添加到叶子中的动画，就是组合动画：</p> <pre> <code class="language-objectivec">  CAAnimationGroup *animationgroup = [CAAnimationGroup animation]; if (self.scale) {   animationgroup.animations = @[scaleAnimation, positionAnimation, rotateAnimation]; } else {   animationgroup.animations = @[positionAnimation, rotateAnimation]; } animationgroup.duration = 0.5f; animationgroup.fillMode = kCAFillModeForwards; animationgroup.timingFunction = [CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionEaseIn]; [item.layeraddAnimation:animationgroupforKey:@"Expand"]; item.center = item.endPoint;   </code></pre> <p>关于收起的动画也差不多，就不说了！</p> <h2>结尾</h2> <p>本篇文章主要是想教大家如何去设计一个动画及UI控件，当然笔者所讲的并不一定是最好的，也许你就能想出更简单更优秀的办法来实现。</p> <p>本篇文章的源代码不放出，只放出关键代码。对于学习能力比较强，比较爱研究的小伙伴已经足够了。如果非要源代码，可私聊我购买！</p> <h2>关注我</h2> <table> <thead> <tr> <th>联系方式</th> <th>关注</th> <th>备注</th> </tr> </thead> <tbody> <tr> <td>付费解答群</td> <td>347363861（付费解答群）</td> <td>有需求或者私活可入群私聊</td> </tr> <tr> <td>标哥博客iOS交流群</td> <td>552095943(新)|259290340(新)</td> <td>群里很活跃，定期清理</td> </tr> <tr> <td>标哥博客iOS交流群</td> <td>324400294(满)|494669518(满)|494669518(满)|250351140(满)</td> <td>群里很活跃，定期清理</td> </tr> <tr> <td>微信公众号</td> <td><a href="http://mp.weixin.qq.com/s?__biz=MzIzMzA4NjA5Mw==&mid=404311320&idx=1&sn=805d4b9fb92c5b6ff721bb1d9966f41b#rd" rel="nofollow,noindex">iOSDevShares</a></td> <td>关注公众号阅读好文章</td> </tr> <tr> <td>新浪微博</td> <td>@标哥的技术博客</td> <td>关注微博动态</td> </tr> <tr> <td>GITHUB</td> <td><a href="/misc/goto?guid=4959654077363809730" rel="nofollow,noindex">CoderJackyHuang</a></td> <td>文章Demo都在GITHUB</td> </tr> <tr> <td>联系标哥</td> <td><a href="/misc/goto?guid=4959664424999406415" rel="nofollow,noindex">关于标哥</a></td> <td>保持活跃在最前线</td> </tr> </tbody> </table> <p>版权声明：本文为【标哥的技术博客】原创出品，欢迎转载，转载时请注明出处！</p> <p><img src="https://simg.open-open.com/show/b77d35c72eabd171708611869441ee7c.png"> <img src="https://simg.open-open.com/show/c09c408fb39c645e0ff0f49993b78c1a.png"> <img src="https://simg.open-open.com/show/4352e4a2283050d141922e4e23bc7ffb.png"></p> <p> </p> <p>来自： <a href="/misc/goto?guid=4959673741080118046" rel="nofollow">http://www.henishuo.com/coreanimation-tree-circle-expend/</a></p> <p> </p>