Question

我正在尝试快速制作一个项目并且对语言不熟悉。

我试图让UIView显示并消失，然后向上滑动并在屏幕上向下滑动。我目前正在使用结构来存储视图的实例，以便能够使用swipeUp（）和swipeDown（）方法进行更改。

当我尝试访问this.view.bounds.height时，它告诉我＆＃34;实例成员视图不能用于类型SecondViewController＆＃34;

以下是我的代码

import UIKit
import FBSDKCoreKit
import FBSDKLoginKit
import FBSDKShareKit




class SecondViewController: UIViewController {

let label = UILabel()


override func viewDidLoad() {
    super.viewDidLoad()

    let swipeUp = UISwipeGestureRecognizer(target: self, action: "swipeUp")
    swipeUp.direction = UISwipeGestureRecognizerDirection.up
    self.view.addGestureRecognizer(swipeUp)

    let swipeDown = UISwipeGestureRecognizer(target: self, action: "swipeDown")
    swipeDown.direction = UISwipeGestureRecognizerDirection.down
    self.view.addGestureRecognizer(swipeDown)


}

struct myVars{

    let v = MyCustomView(frame: CGRect(x: 0, y: this.view.bounds.height / 2, width: this.view.bounds.width, height: self.view.bounds.height / 2))

}


func swipeUp(){

    if myVars.v.isDescendantOfView(self) {

        myVars.v.isHidden = false

    }

    else {
        self.view.addSubview(myVars.v)
    }



}

func swipeDown(){
    myVars.v.isHidden = true
}




}

您能告诉我我的代码有什么问题吗？或者让我知道是否有更好的方法可以完成这项工作？

Answer 1

只需选中替换您的代码使用以下代码即可。取代#selector（ViewController.swipeUp）放置viewController的名称

let swipeUp = UISwipeGestureRecognizer(target: self, action: #selector(ViewController.swipeUp))
            swipeUp.direction = UISwipeGestureRecognizerDirection.up
            self.view.addGestureRecognizer(swipeUp)



let swipeDown = UISwipeGestureRecognizer(target: self, action: #selector(ViewController.swipeDown))
                swipeDown.direction = UISwipeGestureRecognizerDirection.down
                self.view.addGestureRecognizer(swipeDown)

使UIView显示并消失，向上滑动并向下滑动 - Swift

1 个答案: