ios小技巧：导航控制器相关

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ios小技巧：导航控制器相关

#ios小技巧：导航控制器相关| 来源: 网络整理| 查看: 265

https://github.com/ltebean/LTNavigationBar *navBar酷炫 http://www.jianshu.com/p/b2585c37e14b http://www.jianshu.com/p/31f177158c9e *

返回至某个VC for (UIViewController *controller in self.navigationController.viewControllers) { if ([controller isKindOfClass:[AViewController class]]) { AViewController *A =(AViewController *)controller; [self.navigationController popToViewController:A animated:YES]; } } 获取当前导航控制器 - (UIViewController *)currentViewController { UIWindow *keyWindow = [UIApplication sharedApplication].keyWindow; UIViewController *vc = keyWindow.rootViewController; while (vc.presentedViewController) { vc = vc.presentedViewController; if ([vc isKindOfClass:[UINavigationController class]]) { vc = [(UINavigationController *)vc visibleViewController]; } else if ([vc isKindOfClass:[UITabBarController class]]) { vc = [(UITabBarController *)vc selectedViewController]; } } return vc; } - (UINavigationController *)currentNavigationController { return [self currentViewController].navigationController; } 毛玻璃、动态隐藏

https://www.jianshu.com/p/b2585c37e14b

判断当前VC是push还是present的方式显示的 NSArray *viewcontrollers=self.navigationController.viewControllers; if (viewcontrollers.count > 1) { if ([viewcontrollers objectAtIndex:viewcontrollers.count - 1] == self) { //push方式 [self.navigationController popViewControllerAnimated:YES]; } } else { //present方式 [self dismissViewControllerAnimated:YES completion:nil]; } 获取当前控制器（不管是push还是present方式） - (UIViewController *)getVisibleViewControllerFrom:(UIViewController*)vc { if ([vc isKindOfClass:[UINavigationController class]]) { return [self getVisibleViewControllerFrom:[((UINavigationController*) vc) visibleViewController]]; }else if ([vc isKindOfClass:[UITabBarController class]]){ return [self getVisibleViewControllerFrom:[((UITabBarController*) vc) selectedViewController]]; } else { if (vc.presentedViewController) { return [self getVisibleViewControllerFrom:vc.presentedViewController]; } else { return vc; } } } + (UIViewController *)jsd_getCurrentViewController{ UIViewController* currentViewController = [self jsd_getRootViewController]; BOOL runLoopFind = YES; while (runLoopFind) { if (currentViewController.presentedViewController) { currentViewController = currentViewController.presentedViewController; } else if ([currentViewController isKindOfClass:[UINavigationController class]]) { UINavigationController* navigationController = (UINavigationController* )currentViewController; currentViewController = [navigationController.childViewControllers lastObject]; } else if ([currentViewController isKindOfClass:[UITabBarController class]]) { UITabBarController* tabBarController = (UITabBarController* )currentViewController; currentViewController = tabBarController.selectedViewController; } else { NSUInteger childViewControllerCount = currentViewController.childViewControllers.count; if (childViewControllerCount > 0) { currentViewController = currentViewController.childViewControllers.lastObject; return currentViewController; } else { return currentViewController; } } } return currentViewController; } + (UIViewController *)jsd_getRootViewController{ UIWindow* window = [[[UIApplication sharedApplication] delegate] window]; NSAssert(window, @"The window is empty"); return window.rootViewController; } 是否允许左滑返回 if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) { self.navigationController.interactivePopGestureRecognizer.enabled = NO; //YES; } 全屏测滑返回

http://www.jianshu.com/p/bc85a3d37519

QQ.png

@interface LPNavigationController : UINavigationController @property(nullable, nonatomic, readonly) UIGestureRecognizer *fullInteractivePopGestureRecognizer; @end @interface LPNavigationController () @property(nullable, nonatomic, readwrite) UIGestureRecognizer *fullInteractivePopGestureRecognizer; @end @implementation LPNavigationController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. self.interactivePopGestureRecognizer.enabled = NO; UIView *view = self.interactivePopGestureRecognizer.view; id target = self.interactivePopGestureRecognizer.delegate; SEL action = NSSelectorFromString(@"handleNavigationTransition:"); self.fullInteractivePopGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:target action:action]; self.fullInteractivePopGestureRecognizer.delaysTouchesBegan = YES; self.fullInteractivePopGestureRecognizer.delegate = self; [view addGestureRecognizer:self.fullInteractivePopGestureRecognizer]; } - (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer { // 左滑时可能与UITableView左滑删除手势产生冲突 CGPoint translation = [(UIPanGestureRecognizer *)gestureRecognizer translationInView:gestureRecognizer.view]; if (translation.x 50) { [self showView:self.navigationController.navigationBar hidden:NO]; NSInteger barH = kScreenIphoneX?88:64; CGFloat alpha = MIN(1, 1 - ((50 + barH - scrollView.contentOffset.y) / barH)); [self.navigationController.navigationBar setBackgroundColor:[mainThemeRed colorWithAlphaComponent:alpha]]; }else{ [self showView:self.navigationController.navigationBar hidden:NO]; [self.navigationController.navigationBar setBackgroundColor:[mainThemeRed colorWithAlphaComponent:0.0f]]; } } -(void)showView:(UIView *)view hidden:(BOOL)hidden{ CATransition *animation = [CATransition animation]; animation.type = kCATransitionFade; animation.duration = 0.4; [view.layer addAnimation:animation forKey:nil]; view.hidden = hidden; } 导航栏颜色 [self.navigationController.navigationBar setBackgroundImage:[UIImage imageWithColor:[UIColor greenColor] size:CGSizeMake(1, 1)] forBarMetrics:UIBarMetricsDefault];

背景图

[self.navigationBar setBackgroundImage:[UIImage imageNamed:@"navbar"] forBarMetrics:UIBarMetricsDefault]; 获取前一个控制器 * - (UIViewController *)backViewController { NSInteger myIndex = [self.navigationController.viewControllers indexOfObject:self]; if ( myIndex != 0 && myIndex != NSNotFound ) { return [self.navigationController.viewControllers objectAtIndex:myIndex-1]; } else { return nil; } } 获取View所在的控制器 - (UIViewController *)viewController { UIViewController *viewController = nil; UIResponder *next = self.nextResponder; while (next) { if ([next isKindOfClass:[UIViewController class]]) { viewController = (UIViewController *)next; break; } next = next.nextResponder; } return viewController; } 状态栏颜色设置 - (void)setStatusBarBackgroundColor:(UIColor *)color { UIView *statusBar = [[[UIApplication sharedApplication] valueForKey:@"statusBarWindow"] valueForKey:@"statusBar"]; if ([statusBar respondsToSelector:@selector(setBackgroundColor:)]) { statusBar.backgroundColor = color; } } 自定义navBar左按钮距左边的距离 UIBarButtonItem *leftItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"gobackItem.png"] style:UIBarButtonItemStylePlain target:self action:@selector(backViewcontroller)]; UIBarButtonItem *fixedItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil]; fixedItem.width = -16; // 设置边框距离,可根据需要调节 self.navigationItem.leftBarButtonItems = @[fixedItem, leftItem]; Navbar纯透明 //第一种方法 [self.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault]; //第二种方法 [[self.navigationBar subviews] objectAtIndex:0].alpha = 0; 去掉导航栏底部的黑线 self.navigationBar.shadowImage = [UIImage new]; 根据滑动距离实现NavBar透明度渐变-隐藏-显示第一种 - (void)scrollViewDidScroll:(UIScrollView *)scrollView{ //1、随滑动contentOffset控制透明度 CGFloat offsetToShow = 200.0; CGFloat alpha = (offsetToShow - scrollView.contentOffset.y) / offsetToShow; [[self.navigationController.navigationBar subviews] objectAtIndex:0].alpha = alpha; //2、先隐藏，滑动多少就完全显示 CGFloat offsetToShow = 200.0; CGFloat alpha = 1 - (offsetToShow - scrollView.contentOffset.y) / offsetToShow; [[self.navigationController.navigationBar subviews] objectAtIndex:0].alpha = alpha; } 第二种 - (void)scrollViewDidScroll:(UIScrollView *)scrollView { CGFloat offsetToShow = 200.0; CGFloat alpha = 1 - (offsetToShow - scrollView.contentOffset.y) / offsetToShow; [self.navigationController.navigationBar setShadowImage:[UIImage new]]; [self.navigationController.navigationBar setBackgroundImage:[self imageWithColor:[[UIColor orangeColor]colorWithAlphaComponent:alpha]] forBarMetrics:UIBarMetricsDefault]; } 停止滚动时显示导航栏 -(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{ [[self.navigationController.navigationBar subviews] objectAtIndex:0].alpha = 1; } 根据上滑、下滑决定隐藏导航栏 - (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset{ NSLog(@"======== %lf", velocity.y); if(velocity.y > 0) { [self.navigationController setNavigationBarHidden:YES animated:YES]; }else { [self.navigationController setNavigationBarHidden:NO animated:YES]; } }

velocity.y这个量，在上滑和下滑时变化极小（小数），但因为方向不同，有正负之分，这就很好处理了。

切换控制器时添加自定义动画 ViewController *VC = [ [ViewController alloc] init]; //创建动画 CATransition *animation = [CATransition animation]; //设置运动轨迹的速度 animation.timingFunction = UIViewAnimationCurveEaseInOut; //设置动画类型为立方体动画 animation.type = @"cube"; //设置动画时长 animation.duration =1.0f; //设置运动的方向 animation.subtype =kCATransitionFromRight; //控制器间跳转动画 [[UIApplication sharedApplication].keyWindow.layer addAnimation:animation forKey:nil]; [self presentViewController:VC animated:NO completion:nil]; /*附：动画类型*/ typedef enum : NSUInteger { fade = 1, //淡入淡出 push, //推挤 reveal, //揭开 moveIn, //覆盖 cube, //立方体 suckEffect, //吮吸 oglFlip, //翻转 rippleEffect, //波纹 pageCurl, //翻页 pageUnCurl, //反翻页 cameraIrisHollowOpen, //开镜头 cameraIrisHollowClose, //关镜头 curlDown, //下翻页 curlUp, //上翻页 flipFromLeft, //左翻转 flipFromRight, //右翻转 } AnimationType; 导航栏的隐藏与显示

有的页面需要导航栏，有的页面不想要导航栏。采用self.navigationController.navigationBar.hidden = YES/NO; 进行设置，无法达到理想需求。正确做法如下：

第一种做法 - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; [self.navigationController setNavigationBarHidden:YES animated:YES]; } - (void)viewWillDisappear:(BOOL)animated { [super viewWillDisappear:animated]; [self.navigationController setNavigationBarHidden:NO animated:YES]; } 第二种做法 ( 推荐 ) @interface WLHomePageController () @end @implementation WLHomePageController #pragma mark - lifeCycle - (void)viewDidLoad { [super viewDidLoad]; self.navigationController.delegate = self; } #pragma mark - 导航控制器代理方法：将要显示控制器 - (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated { // 判断要显示的控制器是否是自己 BOOL isShowHomePage = [viewController isKindOfClass:[self class]]; [self.navigationController setNavigationBarHidden:isShowHomePage animated:YES]; } 统一设置导航items数据主题 +(void)setupNavigationItemsTheme { UIBarButtonItem *barButtonItem = [UIBarButtonItem appearance]; // 设置字体颜色 [barButtonItem setTitleTextAttributes:@{ NSForegroundColorAttributeName : [UIColor blackColor], NSFontAttributeName : [UIFont systemFontOfSize:14]} forState:UIControlStateNormal]; [barButtonItem setTitleTextAttributes:@{ NSForegroundColorAttributeName : [UIColor redColor]} forState:UIControlStateHighlighted]; [barButtonItem setTitleTextAttributes:@{ NSForegroundColorAttributeName : [UIColor lightGrayColor]} forState:UIControlStateDisabled]; } 导航栏多个item UIButton *addBtn = [UIButton buttonWithType:UIButtonTypeCustom]; [addBtn addTarget:self action:@selector(clickRightItem:) forControlEvents:UIControlEventTouchUpInside]; [addBtn setImage:[UIImage imageNamed:@"note"] forState:UIControlStateNormal]; addBtn.tag = 1; UIBarButtonItem *addBtnItem = [[UIBarButtonItem alloc] initWithCustomView:addBtn]; UIButton *scanBtn = [UIButton buttonWithType:UIButtonTypeCustom]; [scanBtn addTarget:self action:@selector(clickRightItem:) forControlEvents:UIControlEventTouchUpInside]; [scanBtn setImage:[UIImage imageNamed:@"scan"] forState:UIControlStateNormal]; scanBtn.tag = 2; UIBarButtonItem *scanBtnItem = [[UIBarButtonItem alloc] initWithCustomView:scanBtn]; UIBarButtonItem *space = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil]; space.width = 20; self.navigationItem.rightBarButtonItems = @[addBtnItem,space,scanBtnItem];

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ios小技巧：导航控制器相关

ios小技巧：导航控制器相关

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