自定義NavgationBa返回按鈕

iOS  上UINavigationController視圖壓棧形式，可以在當前視圖無限制push許多視圖，然而一些會覺得自帶的push按鈕不夠美觀，而且當上的上一個頁面title很長的時候，那個返回按鈕就很長,怎樣定義一個自己返回按鈕呢？向第三幅圖片一樣。。。

需要push的視圖里面定義一個事件

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

替換返回按鈕，定義自定義按鈕

- (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