想要通过在 swift 中使用滑动手势在选项卡栏之间导航

我想使用滑动手势在选项卡栏控制器之间导航，同时保留默认选项卡栏。我使用了这段代码，但显示错误。

import UIKit

 class FirstViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()


        var leftSwipe = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipes:"))


        leftSwipe.direction = .Left


        view.addGestureRecognizer(leftSwipe)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.

        func handleSwipes(sender:UISwipeGestureRecognizer) {
            if (sender.direction == .Left) {

                let storyboard = UIStoryboard(name: "Main", bundle: nil)
                let vc = storyboard.instantiateViewControllerWithIdentifier("SecondViewController") as! UIViewController
                self.presentViewController(vc, animated: false, completion: nil)

            }

            if (sender.direction == .Right) {

            }
        }


    }


}

你的职能handleSwipes必须是类级别函数，而不是另一个函数的内部函数：

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.

    // remove the func from here
}

func handleSwipes(sender:UISwipeGestureRecognizer) {
    if (sender.direction == .Left) {
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let vc = storyboard.instantiateViewControllerWithIdentifier("SecondViewController") as! UIViewController
        self.presentViewController(vc, animated: false, completion: nil)
    }

    if (sender.direction == .Right) {

    }
}

这是我看到的明显错误。您应该始终将错误消息与您的问题一起发布，以提高答案的质量。