iOS仿微信相册界面翻转过渡动画

点开微信相册的时候，想要在相册图片界面跳转查看点赞和评论时，微信会采用界面翻转的过渡动画来跳转到评论界面，好像是在图片界面的背面一样，点击完成又会翻转回到图片界面，这不同于一般的导航界面滑动动画，觉得很有意思，于是自己学着做了一下，其实也很简单，下面是实现的类似的效果图：



在图片界面点击右下角的查看评论会翻转到评论界面，评论界面点击左上角的返回按钮会反方向翻转回图片界面，真正的实现方法，与传统的导航栏过渡其实只有一行代码的区别，让我们来看看整体的实现。

首先我们实现图片界面，这个界面上有黑色的背景，一张图片和一个查看评论的按钮：

<code class="language-objective-c hljs objectivec has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;">- (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span>)viewDidLoad {
[<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">super</span> viewDidLoad];
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.view</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.backgroundColor</span> = [<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIColor</span> blackColor];<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 背景设为黑色</span>

<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 图片</span>
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIImageView</span> *myImage = [[<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIImageView</span> alloc] initWithFrame:CGRectMake(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>, (SCREENHEIGHT - SCREENWIDTH + <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">100</span>) / <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>, SCREENWIDTH, SCREENWIDTH - <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">100</span>)];
myImage<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.image</span> = [<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIImage</span> imageNamed:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"image.jpg"</span>];
[<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.view</span> addSubview:myImage];

<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 右下角查看评论的按钮</span>
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UILabel</span> *label = [[<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UILabel</span> alloc] initWithFrame:CGRectMake(SCREENWIDTH - <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">100</span>, SCREENHEIGHT - <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">50</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">80</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">30</span>)];
label<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.text</span> = @<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"查看评论"</span>;
label<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.textColor</span> = [<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIColor</span> whiteColor];
label<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.userInteractionEnabled</span> = <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">YES</span>;
UITapGestureRecognizer *labelTap = [[UITapGestureRecognizer alloc] initWithTarget:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span> action:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">@selector</span>(viewComment)];
[label addGestureRecognizer:labelTap];
[<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.view</span> addSubview:label];
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li></ul>

到这里其实都没什么特别的，现在来看看查看评论文字的点击响应，也就是跳转的实现：

<code class="language-objective-c hljs objectivec has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 查看评论</span>
- (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span>)viewComment {
CommentViewController *commentVC = [[CommentViewController alloc] init];
[<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.navigationController</span> pushViewController:commentVC animated:<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">NO</span>];
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 设置翻页动画为从右边翻上来</span>
[<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIView</span> transitionWithView:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.navigationController</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.view</span> duration:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span> options:UIViewAnimationOptionTransitionFlipFromRight animations:<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span> completion:<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span>];
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul>

可以看到，就是比普通的push多了一行代码而已，原本的push部分我们的animated参数要设为NO，然后再行设置翻转的动画即可，这里options的参数可以看出，动画是从右边开始翻转的，duration表示动画时间，很简单地就实现了翻转到评论界面。

我们再看看评论界面的代码，界面元素上有一个返回按钮，一个图片，一行文字，但是这个返回按钮的特殊在于，我们重新定义了导航栏的返回按钮，如果什么都不做，导航栏其实会自带一个带箭头的返回按钮，点击后就是正常的滑动回上一个界面，这里我们要用我们自己的按钮来取代它：

<code class="language-objective-c hljs objectivec has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;">- (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span>)viewDidLoad {
[<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">super</span> viewDidLoad];
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.view</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.backgroundColor</span> = [<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIColor</span> whiteColor];<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 背景色设为白色</span>

<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 自定义导航栏按钮</span>
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIBarButtonItem</span> *backButton = [[<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIBarButtonItem</span> alloc] initWithTitle:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"返回"</span> style:UIBarButtonItemStyleBordered target:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span> action:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">@selector</span>(back)];
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.navigationItem</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.leftBarButtonItem</span> = backButton;

<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 图片</span>
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIImageView</span> *myImage = [[<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIImageView</span> alloc] initWithFrame:CGRectMake((SCREENWIDTH - <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">300</span>)/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>, (SCREENHEIGHT - <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">200</span>)/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span> - <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">100</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">300</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">200</span>)];
myImage<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.image</span> = [<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIImage</span> imageNamed:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"image.jpg"</span>];
[<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.view</span> addSubview:myImage];

<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 一条文本</span>
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UILabel</span> *label = [[<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UILabel</span> alloc] initWithFrame:CGRectMake((SCREENWIDTH - <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">200</span>)/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>, myImage<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.frame</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.origin</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.y</span> + myImage<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.frame</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.size</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.height</span> + <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">20</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">200</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">30</span>)];
label<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.text</span> = @<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100个赞，100条评论"</span>;
label<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.textAlignment</span> = NSTextAlignmentCenter;
[<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.view</span> addSubview:label];
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li></ul>

可以看到，我们自定义了一个UIBarButtonItem按钮，然后用它放在导航栏的leftBarButtonItem的位置，这样就取代了原本的返回按钮了，然后在按钮点击响应中去设置翻转动画：

<code class="language-objective-c hljs objectivec has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 返回上一页</span>
- (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span>)back {
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 设置翻转动画为从左边翻上来</span>
[<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIView</span> transitionWithView:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.navigationController</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.view</span> duration:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span> options:UIViewAnimationOptionTransitionFlipFromLeft animations:<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span> completion:<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span>];
[<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.navigationController</span> popViewControllerAnimated:<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">NO</span>];
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li></ul>

还是一样的，不过这次要先设置动画，再进行pop，否则没有效果，而且pop的动画参数也要设为NO，可以看到这次的options的参数是从左边开始翻转，在视觉上就有一个反方向翻回去的效果。

以上，就是该过渡动画的全部实现过程了，其实无非就是加了两行代码而已，非常简单，但是偶尔用一下，还是能带来非常好的效果的~

这里有我的示例工程：https://github.com/Cloudox/ReverseDemo