iOS左右滑动标签页导航的设计
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:
#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。