#import "BWNavigationController.h"#import "UIBarButtonItem+Item.h"@interface BaseNavigationController () <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];  // 屏幕邊緣滑動(dòng)(只能在屏幕的邊緣才能觸發(fā)該手勢，不能在屏幕的任意一點(diǎn)觸發(fā)該手勢)  UIScreenEdgePanGestureRecognizer *edgePanGestureRecognizer = (UIScreenEdgePanGestureRecognizer *)self.interactivePopGestureRecognizer;  // 滑動(dòng)手勢（禁用系統(tǒng)自帶的屏幕邊緣滑動(dòng)手勢，使用自定義的滑動(dòng)手勢目的就是達(dá)到觸摸屏幕上的任意一點(diǎn)向右滑動(dòng)都能實(shí)現(xiàn)返回的效果）  UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:edgePanGestureRecognizer.delegate action:@selector(handleNavigationTransition:)];  panGestureRecognizer.delegate = self;  [self.view addGestureRecognizer:panGestureRecognizer];  // 禁用系統(tǒng)的屏幕邊緣滑動(dòng)手勢  edgePanGestureRecognizer.enabled = NO;}// 是否允許觸發(fā)手勢，如果是根視圖控制器則不需要- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {  return self.childViewControllers.count > 1;}- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {  // 統(tǒng)一設(shè)置返回按鈕  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