#import "BWNavigationController.h"
#import "UIBarButtonItem+Item.h"

@interface BWNavigationController () <UIGestureRecognizerDelegate>

@end

@implementation BWNavigationController

+ (void)load {
    [super load];
    UINavigationBar *navigationBar = [UINavigationBar appearanceWhenContainedIn:self, nil];

    NSMutableDictionary *dict = [NSMutableDictionary dictionary];
    dict[NSFontAttributeName] = [UIFont boldSystemFontOfSize:20];
    [navigationBar setTitleTextAttributes:dict];

    [navigationBar setBackgroundImage:[UIImage imageNamed:@"navigationbarBackgroundWhite"] forBarMetrics:UIBarMetricsDefault];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    UIScreenEdgePanGestureRecognizer *edgePanGestureRecognizer = (UIScreenEdgePanGestureRecognizer *)self.interactivePopGestureRecognizer;
    UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:edgePanGestureRecognizer.delegate action:@selector(handleNavigationTransition:)];
    panGestureRecognizer.delegate = self;
    [self.view addGestureRecognizer:panGestureRecognizer];

    edgePanGestureRecognizer.enabled = NO;
}

// 是否允许除法手势，如果是根视图控制器则不需要
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    return self.childViewControllers.count > 1;
}

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {
    // 统一设置返回按钮
    NSInteger count = self.childViewControllers.count;
    if (count > 0) {
        viewController.hidesBottomBarWhenPushed = YES;
        viewController.navigationItem.leftBarButtonItem = [UIBarButtonItem backBarButtonItemWithImage:[UIImage imageNamed:@"navigationButtonReturn"] highlightImage:[UIImage imageNamed:@"navigationButtonReturnClick"] tagert:self action:@selector(back) title:@"返回"];
    }

    [super pushViewController:viewController animated:animated];
}

- (void)back {
    [self popViewControllerAnimated:YES];
}
@end