UITabbarController 跳转到任意子控制器

UITabBarController的简单使用

UITabBarController的使用步骤

初始化UITabBarController设置UIWindow的rootViewController为UITabBarController根据具体情况，通过addChildViewController方法添加对应个数的子控制器

UITabBarController的子控制器

    UITabBarController添加控制器的方式有2种

添加单个子控制器

<code class="hljs erlang has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-pp" style="box-sizing: border-box;">- <span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(void)</span>addChildViewController:<span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(<span class="hljs-variable" style="box-sizing: border-box;">UIViewController</span> *)</span>childController;</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; 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; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

设置子控制器数组

<code class="hljs objectivec has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">@property</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">nonatomic</span>,copy) <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSArray</span> *viewControllers;</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; 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; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

UITabBarController的简单创建

<code class="hljs objectivec has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"> <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 1.创建窗口</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;">.window</span> = [[<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIWindow</span> alloc] initWithFrame:[UIScreen mainScreen]<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.bounds</span>];<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 2.创建tabBarController</span>    <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UITabBarController</span> *tabBarController = [[<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UITabBarController</span> alloc] init]; <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 3.设置窗口根控制器</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;">.window</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.rootViewController</span> = tabBarController; <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 3.1 创建三个子控制器</span>    <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIViewController</span> *vc1 = [[<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIViewController</span> alloc] init];    vc1<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> redColor];    <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIViewController</span> *vc2 = [[<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIViewController</span> alloc] init];    vc2<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> greenColor];    <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIViewController</span> *vc3 = [[<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">UIViewController</span> alloc] init];    vc3<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> blueColor];    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//[tabBarController addChildViewController:vc1];</span>    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//[tabBarController addChildViewController:vc2];</span>    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//[tabBarController addChildViewController:vc3];</span>    tabBarController<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.viewControllers</span> = @[vc1,vc2,vc3]; <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 4.显示</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;">.window</span> makeKeyAndVisible];</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; 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; background-color: rgb(238, 238, 238);"><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><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li></ul>

UITabBar

• 如果UITabBarController有N个子控制器，那么UITabBar内部就会有N个UITabBarButton作为子控件

• 如果UITabBarController有4个子控制器，那么UITabBar的结构大致如下图所示

UITabBarButton

App主流框架结构

由于iOS9之后，3D touch的出现，并且我们好多APP都是采用的上图框架。此时需要我们在touch之后点选某一标签跳转到特定的界面。可能有些人会跟我一样忽略了这样一个方法：

[self.tabBarController setSelectedIndex:2]

该方法可让我们在进入APP的时候选择显示tabBarController的哪个自控制器或者哪个界面了。