UINavigationController

案例一：实现全屏滑动

- (void)viewDidLoad {
    [super viewDidLoad];
    self.title = @"替换系统手势";
    NSArray *targetsArr =  [self.navigationController.interactivePopGestureRecognizer valueForKey:@"targets"];
    id target = [[targetsArr lastObject] valueForKey:@"target"];
    SEL actionSEL = NSSelectorFromString(@"handleNavigationTransition:");
    UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:target action:actionSEL];
    [self.view addGestureRecognizer:panGesture];
    panGesture.delegate = self;
}
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
    return self.navigationController.childViewControllers.count != 1;
}

案例二：去掉导航栏下的线

    UIView * backgroundView = [self.navigationBar subviews].firstObject;
    UIView * navLine = [backgroundView.subviews firstObject];
    navLine.hidden = YES;

案例三：隐藏tabbar

-(void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated{

    if (self.viewControllers.count > 0) {
        //viewController是将要被push的控制器
        viewController.hidesBottomBarWhenPushed = YES;
    }
    [super pushViewController:viewController animated:animated];
    
}

案例三：隐藏导航栏返回文字

    //ios11 导致箭头下偏
    [[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(510, 550) forBarMetrics:UIBarMetricsDefault];
    //可以采用如下方法
    if (@available(iOS 11 ,*)) {
        [[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(-300, 0) forBarMetrics:UIBarMetricsDefault];
    }else{
        [[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -300) forBarMetrics:UIBarMetricsDefault];
    }

案例四：改变状态栏字体颜色

- (UIStatusBarStyle)preferredStatusBarStyle{
    //白色
    return UIStatusBarStyleLightContent;
}

案例五：隐藏返回按钮

[self.navigationItem setHidesBackButton:YES animated:YES];

案例六：打开手势

self.navigationController.interactivePopGestureRecognizer.delegate = self;
#pragma mark UIGestureRecognizerDelegate
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
    return YES;
}

案例七：导航栏标题字体颜色及其大小

    self.navigationBar.titleTextAttributes = @{NSForegroundColorAttributeName:[UIColor colorWithHex:0x333333 alpha:1],NSFontAttributeName:[UIFont boldSystemFontOfSize:18]};

案例八：改变导航栏图标的颜色

self.navigationBar.tintColor = [UIColor colorWithHex:333333 alpha:1];

案例九：隐藏导航栏
第一种做法
-注意这里一定要用动画的方式隐藏导航栏,这样在使用滑动返回手势的时候效果最好,和上面动图一致.这样做有一个缺点就是在切换tabBar的时候有一个导航栏向上消失的动画.

- (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
设置self为导航控制器的代理,实现代理方法,在将要显示控制器中设置导航栏隐藏和显示,使用这种方式不仅完美切合滑动返回手势,同时也解决了切换tabBar的时候,导航栏动态隐藏的问题.

@interface WLHomePageController () <UINavigationControllerDelegate>

@end

@implementation WLHomePageController 

#pragma mark - lifeCycle
- (void)viewDidLoad {
    [super viewDidLoad];

    // 设置导航控制器的代理为self
    self.navigationController.delegate = self;
}

#pragma mark - UINavigationControllerDelegate
// 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];
}

案例十：UIScrollView手势与侧滑手势冲突

    NSArray *gestureArray = self.navigationController.view.gestureRecognizers;
    for (UIGestureRecognizer *gestureRecognizer in gestureArray) {
        
        if ([gestureRecognizer isKindOfClass:[UIScreenEdgePanGestureRecognizer class]]) {
            [_scrollView.panGestureRecognizer requireGestureRecognizerToFail:gestureRecognizer];
        }
    }

案例十一：在UINavigationController的rootViewController上滑动返回时，会出现界面卡死的情况。在导航栏的基类中作如下处理。

#pragma mark - UIGestureRecognizerDelegate
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
    if (gestureRecognizer == self.interactivePopGestureRecognizer) {
        // 屏蔽调用rootViewController的滑动返回手势
        if (self.viewControllers.count < 2 || self.visibleViewController == [self.viewControllers objectAtIndex:0]) {
            return NO;
        }
    }
    return YES;
}