自定义导航

@implementation SHNavigationController

#pragma mark - lifeCycle

+ (void)load

{

    UINavigationBar *navBar = [UINavigationBar appearanceWhenContainedIn:self, nil];

    

    // 只要是通过模型设置,都是通过富文本设置

    // 设置导航条标题 => UINavigationBar

    NSMutableDictionary *attrs = [NSMutableDictionary dictionary];

    attrs[NSFontAttributeName] = kFontSize(12);

    [navBar setTitleTextAttributes:attrs];

    

    // 设置导航条背景图片

    [navBar setBackgroundImage:kImageName(@"navigationbarBackgroundWhite") forBarMetrics:UIBarMetricsDefault];

    

}

- (void)viewDidLoad {

    [super viewDidLoad];

    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self.interactivePopGestureRecognizer.delegate action:@selector(handleNavigationTransition:)];

    [self.view addGestureRecognizer:pan];

    pan.delegate = self;

    // 禁止之前手势,即只有在左边边缘返回的手势

    self.interactivePopGestureRecognizer.enabled = NO;

    

}

#pragma mark - UIGestureRecognizerDelegate

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch

{

    // 控制手势什么时候触发,只有非根控制器才需要触发手势

    return self.childViewControllers.count > 1;

}

// 重写系统的push方法

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

{

    if (self.childViewControllers.count > 0) {

        // 非根控制器

        /*

         恢复滑动返回功能

         分析:把系统的返回按钮覆盖 -> 1.手势失效(1.手势被清空 2.可能手势代理做了一些事情,导致手势失效)

         */

        

        viewController.hidesBottomBarWhenPushed = YES;

        // 设置返回按钮,只有非根控制器

        viewController.navigationItem.leftBarButtonItem = [UIBarButtonItem backItemWithimage:kImageName(@"navigationButtonReturn") highImage:kImageName(@"navigationButtonReturnClick") target:self action:@selector(back) title:@"返回"];

        

    }

    

    // 真正在跳转

    [super pushViewController:viewController animated:animated];

}

#pragma mark - Private&Public Methods

- (void)back

{

    [self popViewControllerAnimated:YES];

}

@end

tabBarItem的返回按钮分类

#import "UIBarButtonItem+SHItem.h"

@implementation UIBarButtonItem (SHItem)

+ (UIBarButtonItem *)backItemWithimage:(UIImage *)image highImage:(UIImage *)highImage target:(id)target action:(SEL)action title:(NSString *)title{

    UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];

    [backButton setTitle:title forState:UIControlStateNormal];

    [backButton setImage:image forState:UIControlStateNormal];

    [backButton setImage:highImage forState:UIControlStateHighlighted];

    [backButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

    [backButton setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];

    [backButton sizeToFit];

    backButton.contentEdgeInsets = UIEdgeInsetsMake(0, -20, 0, 0);

    [backButton addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];

    

    return  [[UIBarButtonItem alloc] initWithCustomView:backButton];

}

@end