iOS左右滑動標(biāo)簽頁導(dǎo)航的設(shè)計
iOS中左右滑動切換,滑動標(biāo)簽頁導(dǎo)航的設(shè)計思路,具體內(nèi)容如下
iOS開發(fā)中經(jīng)常(幾乎每個APP都含有這樣的頁面吧,幾乎!UI設(shè)計師也都是這樣抄來抄去…..)
demo見Github:SliderTab
估計很多人都會說,直接用第三方就可以了,很多人封裝過,很好用。而且這樣的頁面用第三方2分鐘搞定,省時省力。
筆者也曾用過第三方,但是屢屢出bug。而且不好修改。所以只能自己寫,bug少,代碼通俗易懂,童叟無欺。
這里介紹一個第三方DLSlideView,Github地址:DLSlideView,目前達(dá)到200多個star。但是中間出了一次bug,說是tableView左滑動刪除有問題,后來這個原作者更新了版本,修復(fù)了這個bug。但是我使用的過程中又發(fā)現(xiàn)一個新bug,就是里面放UIScrollView的時候也有問題。
所以此文章不對代碼進(jìn)行封裝,僅提供思路和代碼。這樣才能真正適配光大開發(fā)者(授之以魚不如授之以漁),因?yàn)楣P者認(rèn)為每個頁面都有不同,我們需要掌握思路,這樣萬變不離其宗,任何復(fù)雜的UI頁面都可以用這個思路去寫出來。下面我們來實(shí)現(xiàn)這樣的一個比較時髦的效果,在導(dǎo)航上面加三個tab(其實(shí)就是三個button),支持手勢切換,支持點(diǎn)擊tab切換。
1.理論分析
先觀察這個效果圖,三個UIButton和一個滑動的UILabel,UILabel給一個動畫,讓他的frame跟隨某一個UIButton就可以了。至于跟蹤哪個UIButton,當(dāng)然是點(diǎn)擊到的那個UIButton了,那么沒點(diǎn)擊只是滑動怎么辦?UIScrollView的代理里面獲取當(dāng)前獲得焦點(diǎn)的UIButton就可以了。三個UIButton分別對應(yīng)不同的頁面,每個頁面可能邏輯很多很復(fù)雜,這樣的話如果寫在一個VC里面就顯得臃腫了,我們要想辦法分離代碼,易于維護(hù),并把邏輯分離,這樣的話,就要對應(yīng)3個ViewController。既然支持手勢滑動,我們想到的就是UIScrollView,它有分頁效果,很6 很87。我們可以把三個vc中的view拿出來,分別貼到UIScrollView上面去(就是addSubView)。理論到此完畢,下面上代碼。
2.代碼實(shí)現(xiàn)
我們要在HomeViewController里面放一個UIScrollView,然后初始化三個VC,分別拿到三個VC.view,最后把VC.view貼到UIScrollView上面,實(shí)現(xiàn)UIScrollView的分頁滑動。
代碼:
#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 //懶加載三個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; } //初始化三個UIBtton和一個滑動的UILabel,命名為sliderLabel,三個btn放倒一個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:@"廣場" 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:@"推薦" 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:@"篩選" 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,把三個VC的view貼到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滑動動畫 - (void)sliderAnimationWithTag:(NSInteger)tag{ nearbyBtn.selected = NO; squareBtn.selected = NO; recommendBtn.selected = NO; UIButton *sender = [self buttonWithTag:tag]; sender.selected = YES; //動畫 [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,思路和代碼都有了??梢宰约喝?shí)現(xiàn)了,真的不難,真的不需要用第三方。其實(shí)我本可以封裝一個給大家用的,但是我沒有封裝,目的是讓每個iOS都能對付UI設(shè)計師的這樣的頁面設(shè)計!
以上就是本文的全部內(nèi)容,希望對大家的學(xué)習(xí)有所幫助,也希望大家多多支持腳本之家。
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