使用滑动手势在标签栏之间导航

Question

我想使用滑动手势在我的标签栏之间导航.最简单的方法是什么？我试过这样的事......

import UIKit

class postAdViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        var leftSwipe = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipes:"))
        view.addGestureRecognizer(leftSwipe)    
    }

    func handleSwipes(sender:UISwipeGestureRecognizer) {
        if (sender.direction == .left) {
            let storyboard = UIStoryboard(name: "Main", bundle: nil)
            let vc = storyboard.instantiateViewController(withIdentifier: "favourireviewcontroller") as! UIViewController
            self.present(vc, animated: true, completion: nil)
        }
        if (sender.direction == .right) {

        }
}

如果我试图向右滑动没有任何反应.滑动时,应用程序崩溃以下错误消息

无法识别的选择器发送到实例0x7f924380a730

Answer 1

尝试使用Swift 3选择器语法：

let leftSwipe = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipes(_:))

像这样

override func viewDidLoad() {
    super.viewDidLoad()

    nextButton.layer.cornerRadius = 7

    let leftSwipe = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipes(_:))
    //leftSwipe.direction = .right
    view.addGestureRecognizer(leftSwipe)
}



func handleSwipes(_ sender: UISwipeGestureRecognizer) {
    if (sender.direction == .left) {
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let vc = storyboard.instantiateViewController(withIdentifier: "favourireviewcontroller") as! UIViewController
        self.present(vc, animated: true, completion: nil)
    }

    if (sender.direction == .right) {

    }
}

Swift 3引入此功能是为了使编译器能够检查function您指定的是否确实存在。因此，它比以前的概念要节省得多。