Ios Swift：启动和停止自定义类内活动指示器的动画

我想在自定义类中放置一个活动指示器，以便可以从任何视图控制器启动/停止它

以下代码在启动活动指示器但不停止时起作用，我如何才能做到这一点

static func activityIndicatorFunction(view: UIView, targetVC: UIViewController, animate: Bool) {

    var activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView()

    if animate == false {
        activityIndicator.stopAnimating()
        UIApplication.shared.endIgnoringInteractionEvents()
    } else {
        activityIndicator = UIActivityIndicatorView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
        activityIndicator.backgroundColor = UIColor(red:0.16, green:0.17, blue:0.21, alpha:1)
        activityIndicator.layer.cornerRadius = 6
        activityIndicator.center = targetVC.view.center
        activityIndicator.hidesWhenStopped = true
        activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.whiteLarge
        view.addSubview(activityIndicator)
        activityIndicator.startAnimating()
        //UIApplication.shared.beginIgnoringInteractionEvents()
    }
}

启动活动指示器的示例，如果要停止，则animate参数将为false

Utils.activityIndicatorFunction(view: view, targetVC: self, animate: true)

---

我建议将它们实现为两个独立的方法，并将它们添加到

UIViewController

的扩展中，如下所示：

UIViewController扩展名：

extension UIViewController {
    func showActivityIndicator() {
        let activityIndicator = UIActivityIndicatorView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
        activityIndicator.backgroundColor = UIColor(red:0.16, green:0.17, blue:0.21, alpha:1)
        activityIndicator.layer.cornerRadius = 6
        activityIndicator.center = view.center
        activityIndicator.hidesWhenStopped = true
        activityIndicator.activityIndicatorViewStyle = .WhiteLarge
        activityIndicator.startAnimating()
        //UIApplication.shared.beginIgnoringInteractionEvents()

        activityIndicator.tag = 100 // 100 for example

        // before adding it, you need to check if it is already has been added:
        for subview in view.subviews {
            if subview.tag == 100 {
                print("already added")
                return
            }
        }

        view.addSubview(activityIndicator)
    }

    func hideActivityIndicator() {
        let activityIndicator = view.viewWithTag(100) as? UIActivityIndicatorView
        activityIndicator?.stopAnimating()

        // I think you forgot to remove it?
        activityIndicator?.removeFromSuperview()

        //UIApplication.shared.endIgnoringInteractionEvents()
    }
}

我假设您希望始终将

activityIndicator

显示/隐藏到

ViewController.view

，如果它不是，您可能需要让它成为

UIView

的activityIndicator，而不是

UIViewController

用法：

static func showActivityIndicator(view: UIView, targetVC: UIViewController) {

    var activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView()

    activityIndicator = UIActivityIndicatorView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
    activityIndicator.backgroundColor = UIColor(red:0.16, green:0.17, blue:0.21, alpha:1)
    activityIndicator.layer.cornerRadius = 6
    activityIndicator.center = targetVC.view.center
    activityIndicator.hidesWhenStopped = true
    activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.whiteLarge
    activityIndicator.tag = 1
    view.addSubview(activityIndicator)
    activityIndicator.startAnimating()
    UIApplication.shared.beginIgnoringInteractionEvents()
}

static func hideActivityIndicator(view: UIView) {
    let activityIndicator = view.viewWithTag(1) as? UIActivityIndicatorView
    activityIndicator?.stopAnimating()
    activityIndicator?.removeFromSuperview()
    UIApplication.shared.endIgnoringInteractionEvents()
}

Utils.showActivityIndicator(view: view, targetVC: self)

Utils.hideActivityIndicator(view: view)

例如，考虑到你有两个iBACTS，第一个显示活动指示符，另一个隐藏它，它们应该是：

@IBAction func show(sender: AnyObject) {
    showActivityIndicator()
}

@IBAction func hide(sender: AnyObject) {
    hideActivityIndicator()
}

---

这是协议扩展的完美候选。我最近自己做的

首先在一个文件中创建协议，比如activityindicatorresenter.swift 创建协议扩展名（在同一个文件中…或不同的文件中） 然后，任何视图控制器都可以符合该协议

---

我发现最好只为活动指示器设置一个“标记”，然后在停止动画时引用该标记，使用一个函数隐藏，一个函数显示，正如Ahmad建议的那样。Ahmad F和Guillermo的答案似乎也不错

在my Utils.swift文件中显示/隐藏函数：

static func showActivityIndicator(view: UIView, targetVC: UIViewController) {

    var activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView()

    activityIndicator = UIActivityIndicatorView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
    activityIndicator.backgroundColor = UIColor(red:0.16, green:0.17, blue:0.21, alpha:1)
    activityIndicator.layer.cornerRadius = 6
    activityIndicator.center = targetVC.view.center
    activityIndicator.hidesWhenStopped = true
    activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.whiteLarge
    activityIndicator.tag = 1
    view.addSubview(activityIndicator)
    activityIndicator.startAnimating()
    UIApplication.shared.beginIgnoringInteractionEvents()
}

static func hideActivityIndicator(view: UIView) {
    let activityIndicator = view.viewWithTag(1) as? UIActivityIndicatorView
    activityIndicator?.stopAnimating()
    activityIndicator?.removeFromSuperview()
    UIApplication.shared.endIgnoringInteractionEvents()
}

Utils.showActivityIndicator(view: view, targetVC: self)

Utils.hideActivityIndicator(view: view)

调用显示函数：

static func showActivityIndicator(view: UIView, targetVC: UIViewController) {

    var activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView()

    activityIndicator = UIActivityIndicatorView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
    activityIndicator.backgroundColor = UIColor(red:0.16, green:0.17, blue:0.21, alpha:1)
    activityIndicator.layer.cornerRadius = 6
    activityIndicator.center = targetVC.view.center
    activityIndicator.hidesWhenStopped = true
    activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.whiteLarge
    activityIndicator.tag = 1
    view.addSubview(activityIndicator)
    activityIndicator.startAnimating()
    UIApplication.shared.beginIgnoringInteractionEvents()
}

static func hideActivityIndicator(view: UIView) {
    let activityIndicator = view.viewWithTag(1) as? UIActivityIndicatorView
    activityIndicator?.stopAnimating()
    activityIndicator?.removeFromSuperview()
    UIApplication.shared.endIgnoringInteractionEvents()
}

Utils.showActivityIndicator(view: view, targetVC: self)

Utils.hideActivityIndicator(view: view)

调用隐藏函数：

static func showActivityIndicator(view: UIView, targetVC: UIViewController) {

    var activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView()

    activityIndicator = UIActivityIndicatorView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
    activityIndicator.backgroundColor = UIColor(red:0.16, green:0.17, blue:0.21, alpha:1)
    activityIndicator.layer.cornerRadius = 6
    activityIndicator.center = targetVC.view.center
    activityIndicator.hidesWhenStopped = true
    activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.whiteLarge
    activityIndicator.tag = 1
    view.addSubview(activityIndicator)
    activityIndicator.startAnimating()
    UIApplication.shared.beginIgnoringInteractionEvents()
}

static func hideActivityIndicator(view: UIView) {
    let activityIndicator = view.viewWithTag(1) as? UIActivityIndicatorView
    activityIndicator?.stopAnimating()
    activityIndicator?.removeFromSuperview()
    UIApplication.shared.endIgnoringInteractionEvents()
}

Utils.showActivityIndicator(view: view, targetVC: self)

Utils.hideActivityIndicator(view: view)

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如何使用三元运算符显示或隐藏指示器？比如x=条件？true:false，但是在本例中，使用startAnimating（）和stopAnimating（）@DaniSpringer，您可以将这两种方法组合在一起，这需要一个

Bool

参数来显示/隐藏指示器，因此

组合方法（myCondition？true:false）

。啊，我明白了。在您回复之前，我一直在玩它，最后做了类似的事情：我将三元检查的结果分配给一个变量（不确定是否有该变量的名称），以确定是否调用其中一个变量。但那是干净的！谢谢