在用navigationVC时，返回按钮有时候不想用系统的，这里用继承的方式把按钮替换了，同时也可以实现系统的右滑返回，很简单；
创建一个用于替换系统返回按钮基类的 BasePopViewController : UIViewController；
BasePopViewController.m
#import "BasePopViewController.h"@interface BasePopViewController ()@end@implementation BasePopViewController- (void)viewDidLoad { [super viewDidLoad]; [self setNavigationItemBackButton]; self.navigationController.interactivePopGestureRecognizer.delegate = (id)self;}- (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; if (self.navigationController.viewControllers.count > 1) { self.navigationController.interactivePopGestureRecognizer.enabled = YES; }else{ self.navigationController.interactivePopGestureRecognizer.enabled = NO; }}/** 自定义状态栏 */- (void)setNavigationItemBackButton{ if (self.navigationController.viewControllers.count > 1) { UIBarButtonItem *back = [[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"back_off"] style:UIBarButtonItemStylePlain target:self action:@selector(popBackButtonAction)]; self.navigationItem.leftBarButtonItems = @[back]; }}/** 返回按钮事件 */- (void)popBackButtonAction { [self.navigationController popViewControllerAnimated:YES];}#pragma mark - 下面是设置的状态栏颜色，可忽略-(UIStatusBarStyle)preferredStatusBarStyle{ ///这里设置白色 return UIStatusBarStyleLightContent;}-(BOOL)prefersStatusBarHidden{ return NO;}@end
在需要替换系统的返回按钮时，新建VC继承BasePopViewController即可，如果要在新的VC中获取点击的返回按钮事件，在新的VC中重写 popBackButtonAction 事件即可。
