ios中左右滑动切换，滑动标签页导航的设计思路，具体内容如下
ios开发中经常（几乎每个app都含有这样的页面吧，几乎！ui设计师也都是这样抄来抄去…..）
demo见github：slidertab
估计很多人都会说，直接用第三方就可以了，很多人封装过，很好用。而且这样的页面用第三方2分钟搞定，省时省力。
笔者也曾用过第三方，但是屡屡出bug。而且不好修改。所以只能自己写，bug少，代码通俗易懂，童叟无欺。
这里介绍一个第三方dlslideview，github地址：dlslideview，目前达到200多个star。但是中间出了一次bug，说是tableview左滑动删除有问题，后来这个原作者更新了版本，修复了这个bug。但是我使用的过程中又发现一个新bug，就是里面放uiscrollview的时候也有问题。
所以此文章不对代码进行封装，仅提供思路和代码。这样才能真正适配光大开发者（授之以鱼不如授之以渔），因为笔者认为每个页面都有不同，我们需要掌握思路，这样万变不离其宗，任何复杂的ui页面都可以用这个思路去写出来。下面我们来实现这样的一个比较时髦的效果，在导航上面加三个tab（其实就是三个button），支持手势切换，支持点击tab切换。
1.理论分析
先观察这个效果图，三个uibutton和一个滑动的uilabel，uilabel给一个动画，让他的frame跟随某一个uibutton就可以了。至于跟踪哪个uibutton，当然是点击到的那个uibutton了，那么没点击只是滑动怎么办？uiscrollview的代理里面获取当前获得焦点的uibutton就可以了。三个uibutton分别对应不同的页面，每个页面可能逻辑很多很复杂，这样的话如果写在一个vc里面就显得臃肿了，我们要想办法分离代码，易于维护，并把逻辑分离，这样的话，就要对应3个viewcontroller。既然支持手势滑动，我们想到的就是uiscrollview，它有分页效果，很6 很87。我们可以把三个vc中的view拿出来，分别贴到uiscrollview上面去（就是addsubview）。理论到此完毕，下面上代码。
2.代码实现
我们要在homeviewcontroller里面放一个uiscrollview，然后初始化三个vc，分别拿到三个vc.view,最后把vc.view贴到uiscrollview上面，实现uiscrollview的分页滑动。
代码：
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#import "homeviewcontroller.h"#import "nearbyviewcontroller.h"#import "squareviewcontroller.h"#import "recommendviewcontroller.h" @interface homeviewcontroller ()<uiactionsheetdelegate,uiscrollviewdelegate>{uibarbuttonitem *leftbutton;nearbyviewcontroller *nearbyvc;squareviewcontroller *squarevc;recommendviewcontroller *recommendvc;uiscrollview *mainscrollview;uiview *navview;uilabel *sliderlabel;uibutton *nearbybtn;uibutton *squarebtn;uibutton *recommendbtn;} @end @implementation homeviewcontroller //懒加载三个vc-(nearbyviewcontroller *)nearbyvc{if (nearbyvc==nil) { nearbyvc = [[nearbyviewcontroller alloc]init];}return nearbyvc;} -(squareviewcontroller *)squarevc{if (squarevc==nil) { squarevc = [[squareviewcontroller alloc]init]; }return squarevc;} -(recommendviewcontroller *)recommendvc{if (recommendvc==nil) { recommendvc = [[recommendviewcontroller alloc]init]; }return recommendvc;}//初始化三个uibtton和一个滑动的uilabel，命名为sliderlabel，三个btn放倒一个uiview上面navview。-(void)initui{ navview = [[uiview alloc]initwithframe:cgrectmake(0, 0, kscreenwidth, 40)];nearbybtn = [uibutton buttonwithtype:uibuttontypecustom];nearbybtn.frame = cgrectmake(0, 0, kscreenwidth/4, navview.frame.size.height);nearbybtn.titlelabel.font = [uifont boldsystemfontofsize:19];[nearbybtn addtarget:self action:@selector(slideraction:) forcontrolevents:uicontroleventtouchupinside];[nearbybtn settitle:@"附近" forstate:uicontrolstatenormal];nearbybtn.tag = 1;[navview addsubview:nearbybtn]; squarebtn = [uibutton buttonwithtype:uibuttontypecustom];squarebtn.frame = cgrectmake(nearbybtn.frame.origin.x+nearbybtn.frame.size.width, nearbybtn.frame.origin.y, kscreenwidth/4, navview.frame.size.height);squarebtn.titlelabel.font = [uifont systemfontofsize:16];[squarebtn addtarget:self action:@selector(slideraction:) forcontrolevents:uicontroleventtouchupinside];[squarebtn settitle:@"广场" forstate:uicontrolstatenormal];squarebtn.tag = 2;[navview addsubview:squarebtn]; recommendbtn = [uibutton buttonwithtype:uibuttontypecustom];recommendbtn.frame = cgrectmake(squarebtn.frame.origin.x+squarebtn.frame.size.width, squarebtn.frame.origin.y, kscreenwidth/4, navview.frame.size.height);recommendbtn.titlelabel.font = [uifont systemfontofsize:16];[recommendbtn addtarget:self action:@selector(slideraction:) forcontrolevents:uicontroleventtouchupinside];[recommendbtn settitle:@"推荐" forstate:uicontrolstatenormal];recommendbtn.tag = 3;[navview addsubview:recommendbtn]; sliderlabel = [[uilabel alloc]initwithframe:cgrectmake(0, 40-2, kscreenwidth/4, 4)];sliderlabel.backgroundcolor = kbackgroundcolor;[navview addsubview:sliderlabel];self.navigationitem.titleview = navview;leftbutton = [[uibarbuttonitem alloc]initwithtitle:@"筛选" style:uibarbuttonitemstyleplain target:self action:@selector(leftbarbuttonitempressed:)];leftbutton.tintcolor = [uicolor whitecolor];self.navigationitem.leftbarbuttonitem = leftbutton; } -(uibutton *)theseletedbtn{if (nearbybtn.selected) { return nearbybtn;}else if (squarebtn.selected){ return squarebtn;}else if (recommendbtn.selected){ return recommendbtn;}else{ return nil; }} - (void)viewdidload {[super viewdidload];[self initui];[self setmainscrollview];} //初始化uiscrollview-(void)setmainscrollview{mainscrollview = [[uiscrollview alloc]initwithframe:cgrectmake(0, 0, kscreenwidth, kscreenheight-ktabbarheight)];mainscrollview.delegate = self;mainscrollview.backgroundcolor = [uicolor whitecolor];mainscrollview.pagingenabled = yes;mainscrollview.showshorizontalscrollindicator = no;mainscrollview.showsverticalscrollindicator = no;[self.view addsubview:mainscrollview];nsarray *views = @[self.nearbyvc.view, self.squarevc.view,self.recommendvc.view];for (int i = 0; i < views.count; i++){ //添加背景，把三个vc的view贴到mainscrollview上面 uiview *pageview = [[uiview alloc]initwithframe:cgrectmake(kscreenwidth * i, 0, mainscrollview.frame.size.width, mainscrollview.frame.size.height)]; [pageview addsubview:views[i]]; [mainscrollview addsubview:pageview];}mainscrollview.contentsize = cgsizemake(kscreenwidth * (views.count), 0);}-(uibutton *)buttonwithtag:(nsinteger)tag{if (tag==1) { return nearbybtn;}else if (tag==2){ return squarebtn;}else if (tag==3){ return recommendbtn;}else{ return nil;}}-(void)slideraction:(uibutton *)sender{[self slideranimationwithtag:sender.tag];[uiview animatewithduration:0.3 animations:^{ mainscrollview.contentoffset = cgpointmake(kscreenwidth * (sender.tag - 1), 0);} completion:^(bool finished) { }]; }-(void)scrollviewdidscroll:(uiscrollview *)scrollview{double index_ = scrollview.contentoffset.x / kscreenwidth;[self slideranimationwithtag:(int)(index_+0.5)+1];}#pragma mark - sliderlabel滑动动画- (void)slideranimationwithtag:(nsinteger)tag{nearbybtn.selected = no;squarebtn.selected = no;recommendbtn.selected = no;uibutton *sender = [self buttonwithtag:tag];sender.selected = yes;//动画[uiview animatewithduration:0.3 animations:^{ sliderlabel.frame = cgrectmake(sender.frame.origin.x, sliderlabel.frame.origin.y, sliderlabel.frame.size.width, sliderlabel.frame.size.height); } completion:^(bool finished) { nearbybtn.titlelabel.font = [uifont systemfontofsize:16]; squarebtn.titlelabel.font = [uifont systemfontofsize:16]; recommendbtn.titlelabel.font = [uifont systemfontofsize:16]; sender.titlelabel.font = [uifont boldsystemfontofsize:19];}]; } @end |
好，思路和代码都有了。可以自己去实现了，真的不难，真的不需要用第三方。其实我本可以封装一个给大家用的，但是我没有封装，目的是让每个ios都能对付ui设计师的这样的页面设计！
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：https://blog.csdn.net/IT_ZGC/article/details/52211851
