自定义NavgationBa返回按钮

iOS  上UINavigationController视图压栈形式，可以在当前视图无限制push许多视图，然而一些会觉得自带的push按钮不够美观，而且当上的上一个页面title很长的时候，那个返回按钮就很长,怎样定义一个自己返回按钮呢？向第三幅图片一样。。。

需要push的视图里面定义一个事件

- (IBAction)pushVC:(id)sender {
    NavViewController *navVC = (NavViewController *)[self.storyboard instantiateViewControllerWithIdentifier:@"NavViewController"];
    navVC.title = NSLocalizedString(@"设置", nil);
    [self.navigationController pushViewController:navVC animated:YES];
}

替换返回按钮，定义自定义按钮

- (void)viewDidLoad
{
    [super viewDidLoad];
        
    UIButton *backBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    backBtn.frame = CGRectMake(0, 0, 44, 44);
        
    [backBtn setImage:[UIImage p_w_picpathNamed:@"back.png"] forState:UIControlStateNormal];
    [backBtn addTarget:self action:@selector(doBack:) forControlEvents:UIControlEventTouchUpInside];
        
    UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithCustomView:backBtn];
    self.navigationItem.leftBarButtonItem = backItem;
         
    // Do any additional setup after loading the view.
}
-(void)doBack:(id)sender
{
    [self.navigationController popViewControllerAnimated:YES];
}

×××地址:https://github.com/XFZLDXF/XFNavBarBtn