ios - 如何创建可从 View Controller 访问的函数？

Question

我想定义一种方法来显示和隐藏应用程序中的进度条。但是，我不想在每个 View Controller 中为这些创建本地方法。如何定义将 View 作为参数并对其执行某些操作的全局方法。

这是我尝试过的:

import Foundation
import MBProgressHUD

public class ShowLoading{

    let view = UIView()

    func show(){
        let loadingNotification = MBProgressHUD.showHUDAddedTo(view, animated: true)
        loadingNotification.color = UIColor.blueColor()
        loadingNotification.mode = MBProgressHUDMode.Indeterminate
        loadingNotification.labelText = MyConstants.LOADING_TEXT
    }

    func hide(){
        MBProgressHUD.hideAllHUDsForView(view, animated: true)
    }

}

Answer 1

让一个BaseViewController类继承UIViewController

现在在 BaseViewController 中创建方法

func show() {
let loadingNotification = MBProgressHUD.showHUDAddedTo(view, animated: true)
    loadingNotification.color = UIColor.blueColor()
    loadingNotification.mode = MBProgressHUDMode.Indeterminate
    loadingNotification.labelText = MyConstants.LOADING_TEXT
}   

func hide(){
    MBProgressHUD.hideAllHUDsForView(view, animated: true)
}

现在继承这个BaseViewController给你想要显示进度条的ViewController，然后调用self.show()和self.hide()