调用 swift 中的内部函数

Question

我有一个在我的视图中为微调器设置动画的函数，在这个函数中我添加了两个函数来在需要时启动和停止动画，我需要在这个主函数中调用这个函数，有没有办法实现是吗？

override func viewDidLoad() {
        super.viewDidLoad()
   
        SpinnerAnimiation()

    }
   

    fileprivate func SpinnerAnimiation() {
            let loading = NVActivityIndicatorView(frame: .zero, type: .ballBeat, color: .blue, padding: 0)
            loading.translatesAutoresizingMaskIntoConstraints = false
            view.addSubview(loading)
            NSLayoutConstraint.activate([
                loading.widthAnchor.constraint(equalToConstant: 40),
                loading.heightAnchor.constraint(equalToConstant: 40),
                loading.centerYAnchor.constraint(equalTo: view.centerYAnchor),
                loading.centerXAnchor.constraint(equalTo: view.centerXAnchor)
            ])
            
            func start() {
                loading.startAnimating()
            }
            
            func stop() {
                loading.stopAnimating()
            }
         
        }

Answer 1

我认为更好的方法是将 UI 元素声明为 UIViewController 的属性，配置此元素，然后使用两个函数来在UIViewController.

里面操作

import UIKit

class MyViewController: UIViewController {
   private let loading = NVActivityIndicatorView(frame: .zero, type: .ballBeat, color: .blue, padding: 0)

   private func configureLoading() {
       loading.translatesAutoresizingMaskIntoConstraints = false
            view.addSubview(loading)
            NSLayoutConstraint.activate([
                loading.widthAnchor.constraint(equalToConstant: 40),
                loading.heightAnchor.constraint(equalToConstant: 40),
                loading.centerYAnchor.constraint(equalTo: view.centerYAnchor),
                loading.centerXAnchor.constraint(equalTo: view.centerXAnchor)
            ])
   }

   override func viewDidLoad() {
        super.viewDidLoad()

        configureLoading()
   }

   private func start() {
      loading.startAnimating()
   }
            
   private func stop() {
       loading.stopAnimating()
   }
     
}

Answer 2

您可以使用扩展来添加加载视图和调用开始或停止动画用于在 viewController:

中找到带有标签的 NVActivityIndicatorView

extension UIViewController {
    
    public func addLoadingView() {
        
        // check view with tag
        guard self.view.viewWithTag(9876) == nil else {
            return
        }
        
        let loading = NVActivityIndicatorView(frame: .zero, type: .ballBeat, color: .blue, padding: 0)
        loading.translatesAutoresizingMaskIntoConstraints = false
        
        // set custom tag for prevent add twice
        loading.tag = 9876
        
        self.view.addSubview(loading)
        NSLayoutConstraint.activate([
            loading.widthAnchor.constraint(equalToConstant: 40),
            loading.heightAnchor.constraint(equalToConstant: 40),
            loading.centerYAnchor.constraint(equalTo: view.centerYAnchor),
            loading.centerXAnchor.constraint(equalTo: view.centerXAnchor)
        ])
    }
    
    public func startLoading() {
        guard let loadingView = self.view.viewWithTag(9876) as? UIView else {
            return
        }
        
        loadingView.startAnimation()
    }
    
    public func stopLoading() {
        guard let loadingView = self.view.viewWithTag(9876) as? UIView else {
            return
        }
        
        loadingView.stopAnimation()
    }
}

并像这样使用：

public class ViewController: UIViewController {
    
    public override func viewDidLoad() {
        super.viewDidLoad()
        
        self.addLoadingView()
        self.stopLoading()
        self.startLoading()
    }
}

调用 swift 中的内部函数

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