自定义导航栏返回按钮

返回按钮部分默认是蓝色，如有两个controller，A和B，其中A跳往B。在A中有

ViewControllerB *BVc = [[WeChatSearchViewController alloc]init];
[self.navigationController pushViewController:BVc animated:YES];

那么有两种方式可以修改
①可以在B中(不是A)的viewDidLoad或viewWillAppear写

self.navigationController.navigationBar.tintColor = [UIColor whiteColor];

这样只修改B界面的颜色

②在A中的viewWillAppear或viewDidLoad写

[[UINavigationBar appearance] setTintColor:[UIColor whiteColor]];

这种写法是全局的，会将所有由A跳往的界面的导航栏返回按钮和箭头颜色改变

*************************** 2016-07-14 update ******************************

如conA跳往conB，那么在conB的viewDidLoad中可以添加

-(void)createNav{
    UIButton *navLeft = [UIButton buttonWithType:UIButtonTypeCustom];
    navLeft.size = CGSizeMake(40, 40);
    [navLeft setImage:[UIImage imageNamed:@"top_icon_back"] forState:UIControlStateNormal];
    [navLeft addTarget:self action:@selector(clickTheBackBtn) forControlEvents:UIControlEventTouchUpInside];
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:navLeft];
}

-(void)clickTheBackBtn{
    [self.navigationController popViewControllerAnimated:YES];
}

如若conB为webview的控制器，那么点击返回按钮事件可以这样写

-(void)clickTheBackBtn{
    if ([self.webView canGoBack]) {
        [self.webView goBack];
    } else {
        [self.navigationController popViewControllerAnimated:YES];
    }
}

 效果为

比系统自带的返回按钮看着简约