NagigationBar.gif

簡介

在項目中經(jīng)常碰到首頁頂部是無限輪播,需要靠最上面顯示.有的設(shè)置導(dǎo)航欄為透明等一系列的方法,這個可以借助第三方.或者干脆簡單粗暴的直接隱藏掉導(dǎo)航欄.可是push到下一個頁面的時候是需要導(dǎo)航欄的,如何做了,這里給出兩種方法.

第一種做法

注意這里一定要用動畫的方式隱藏導(dǎo)航欄,這樣在使用滑動返回手勢的時候效果最好,和上面動圖一致.這樣做有一個缺點就是在切換tabBar的時候有一個導(dǎo)航欄向上消失的動畫.

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    
    [self.navigationController setNavigationBarHidden:YES animated:animated];
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    
    [self.navigationController setNavigationBarHidden:NO animated:animated];
}

第二種做法

設(shè)置self為導(dǎo)航控制器的代理,實現(xiàn)代理方法,在將要顯示控制器中設(shè)置導(dǎo)航欄隱藏和顯示,使用這種方式不僅完美切合滑動返回手勢,同時也解決了切換tabBar的時候,導(dǎo)航欄動態(tài)隱藏的問題。最后要記得在控制器銷毀的時候把導(dǎo)航欄的代理設(shè)置為nil。

@interface WLHomePageController () <UINavigationControllerDelegate>

@end

@implementation WLHomePageController 

#pragma mark - lifeCycle
- (void)viewDidLoad {
    [super viewDidLoad];
    
    // 設(shè)置導(dǎo)航控制器的代理為self
    self.navigationController.delegate = self;
}

#pragma mark - UINavigationControllerDelegate
// 將要顯示控制器
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
    // 判斷要顯示的控制器是否是自己
    BOOL isShowHomePage = [viewController isKindOfClass:[self class]];
    
    [self.navigationController setNavigationBarHidden:isShowHomePage animated:YES];
}

- (void)dealloc {
    self.navigationController.delegate = nil;
}

第三種做法

主要是針對A隱藏Nav, A push 到B，B也需要隱藏Nav的這種情況
1、自定義UINavigationController

#import "WYNavigationController.h"
#import "ViewController.h"
#import "WYTargetVC.h"


@interface WYNavigationController ()<UINavigationControllerDelegate, UIGestureRecognizerDelegate>

@end

@implementation WYNavigationController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.delegate = self;
    // 設(shè)置全屏滑動返回
    id target = self.interactivePopGestureRecognizer.delegate;
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:target action:@selector(handleNavigationTransition:)];
    [self.view addGestureRecognizer:pan];
    self.interactivePopGestureRecognizer.enabled = NO;
}

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if (self.viewControllers.count > 0) {
        viewController.hidesBottomBarWhenPushed = YES;
    }
    [super pushViewController:viewController animated:animated];
}


#pragma mark - UINavigationControllerDelegate
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
    // 判斷如果是需要隱藏導(dǎo)航控制器的類，則隱藏
    BOOL isHideNav = ([viewController isKindOfClass:[ViewController class]] || 
                      [viewController isKindOfClass:[WYTargetVC class]]);
    
    [self setNavigationBarHidden:isHideNav animated:YES];
}

但是注意setNavigationBarHidden:YES設(shè)置這行代碼后會導(dǎo)致Nav的滑動返回手勢失效，這也就是為什么前面我們在自定義導(dǎo)航的時候需要設(shè)置全屏滑動返回了。在這里可能有人會說我不想要全屏返回，我就想要原本系統(tǒng)滑動返回的樣式，怎么辦。歡迎大家在留言區(qū)發(fā)表你的看法。

Demo:https://github.com/wangyansnow/WYNagigationDemo