Question

我试图用自定义图片替换UINavigationController BackBarButtonItem，我希望其中没有像这样的后退图标：

我从另一个堆叠的帖子中拍摄这张照片，但我的事情发生了类似的情况

self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"back-btn"]
                                                                         style:UIBarButtonItemStylePlain
                                                                        target:nil
                                                                        action:nil];

if ([UINavigationBar instancesRespondToSelector:@selector(setBackIndicatorImage:)]) {
    [[UINavigationBar appearance] setBackIndicatorImage:[[UIImage alloc] init]];
    [[UINavigationBar appearance] setBackIndicatorTransitionMaskImage:[[UIImage alloc] init]];
}

问题是我无法将此代码转换为Swift。如果有人能帮助我，我将不胜感激。提前谢谢！

Answer 1

获取向后滑动功能：首先在viewDidLoad中设置代理：

self.navigationController!.interactivePopGestureRecognizer.delegate = self

然后在推送时禁用手势：

override func pushViewController(_ viewController: UIViewController, animated: Bool) {
    super.pushViewController(viewController, animated: animated)
    self.interactivePopGestureRecognizer.isEnabled = false
}

并在viewDidDisappear中启用：

self.navigationController!.interactivePopGestureRecognizer.isEnabled = true

Answer 2

使用以下代码：

//Hide Default Back Button First
    self.navigationItem.setHidesBackButton(true, animated:true);

//Your code to show back button
    let backButton = UIButton()
    backButton.setImage(UIImage(named: "imagename"), forState: .Normal)
    backButton.frame = CGRectMake(0, 0, 30, 30)
    backButton.addTarget(self, action: Selector("action"), forControlEvents: .TouchUpInside)

    let rightBarButton = UIBarButtonItem()
    rightBarButton.customView = backButton
   self.navigationItem.leftBarButtonItem = rightBarButton

//Back Button Action

func action()
    {
        self.navigationController?.popViewControllerAnimated(true)
    }

Or you can refer one of the answer

Answer 3

在swift 3中使用以下代码：

class BaseViewController: UIViewController  {

    override func viewDidLoad() {
        super.viewDidLoad()

        self.setBackButton()
    }

    func setBackButton() {
        let backImage = UIImage(named:"back_icon") as UIImage!
        let backButton = UIBarButtonItem(image: backImage, style: UIBarButtonItemStyle.plain, target: self, action: #selector(BaseViewController.viewWillDisappearC) )

        self.navigationItem.leftBarButtonItem = backButton
    }

    func viewWillDisappearC() {
        _ = self.navigationController?.popViewController(animated: true)
    }
}

Answer 4

在swift 2.2（xocde 7.3）中使用以下代码：

类BaseViewController：UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()

    self.setBackButton()
}

func setBackButton() {
    let backImage = UIImage(named:"back_icon") as UIImage!
    let backButton = UIBarButtonItem(image: backImage, style:UIBarButtonItemStyle.Plain, target: self, action: #selector(BaseViewController.viewWillDisappearC) )
    self.navigationItem.leftBarButtonItem = backButton
}

func viewWillDisappearC() {
    self.navigationController?.popViewControllerAnimated(true)
}

}

Swift - 帮助从Objective C语法转换

4 个答案: