Question

我是IOS开发的新手。我创建了一个UIWebView。

在应用程序启动时，我实现了加载程序。

现在，我希望加载器的尺寸要大一些，并带有一些背景图像。

我的代码是这样：

    private var loadingObservation: NSKeyValueObservation?

    private lazy var loadingIndicator: UIActivityIndicatorView = {
        let spinner = UIActivityIndicatorView()
        spinner.translatesAutoresizingMaskIntoConstraints = false

        spinner.color = .black

        return spinner
    }()

override func viewDidLoad() {
        super.viewDidLoad()

        loadingObservation = webView.observe(\.isLoading, options: [.new, .old]) { [weak self] (_, change) in
            guard let strongSelf = self else { return }

            // this is fine
            let new = change.newValue!
            let old = change.oldValue!

            if new && !old {
                strongSelf.view.addSubview(strongSelf.loadingIndicator)
                strongSelf.loadingIndicator.startAnimating()
                NSLayoutConstraint.activate([strongSelf.loadingIndicator.centerXAnchor.constraint(equalTo: strongSelf.view.centerXAnchor),
                                             strongSelf.loadingIndicator.centerYAnchor.constraint(equalTo: strongSelf.view.centerYAnchor)])
                strongSelf.view.bringSubviewToFront(strongSelf.loadingIndicator)
            }
            else if !new && old {
                strongSelf.loadingIndicator.stopAnimating()
                strongSelf.loadingIndicator.removeFromSuperview()
            }
        }


        let myURL = URL(string: "http://192.168.1.4:8080")
        let myRequest = URLRequest(url: myURL!)
        webView.load(myRequest)


    }

通过此代码，我得到的结果如下：

IOS上有专家可以帮助我吗？

我想增加装载机的尺寸。对此真的有任何帮助。谢谢

Answer 1

您可以尝试设置loadingIndicator.transform = CGAffineTransform.init(scaleX: 2, y: 2)

Answer 2

制作extension中的UIActivityIndicatorView-

extension UIActivityIndicatorView {
    func scaleIndicator(factor: CGFloat) {
        transform = CGAffineTransform(scaleX: factor, y: factor)
    }
}

然后可以从任何地方的scaleIndicator()对象访问UIActivityIndicatorView方法-

activityIndicatorView.scaleIndicator(factor: 2.5)

如何增加活动指标的大小

2 个答案: