Question

我想知道是否可以重现Apple在Apple Music中为您的收藏添加相册时使用的这个Toast消息（实际上，我真的不知道如何在屏幕中间，但'吐司'似乎适合）。有任何想法如何使用Swift实现这个？

Answer 1

@ Gordonium在Swift课程中的答案

public class LoaderOverlay {

    private var loaderOverlayView: UIView!

    class var shared: LoaderOverlay {
        struct Static {
            static let instance: LoaderOverlay = LoaderOverlay()
        }
        return Static.instance
    }

    private func setup() {
        loaderOverlayView = UIView(frame: CGRectMake(0, 0, 110, 100))
        loaderOverlayView.backgroundColor = UIColor.blackColor()
        loaderOverlayView.alpha = 0.8
        loaderOverlayView.layer.cornerRadius = 8

        let indicator: UIActivityIndicatorView = UIActivityIndicatorView.init(activityIndicatorStyle: .White)
        indicator.tag = 1
        loaderOverlayView.addSubview(indicator)
        indicator.center = CGPointMake(CGRectGetWidth(loaderOverlayView.frame)/2.0, CGRectGetHeight(loaderOverlayView.frame)/2.0)
        indicator.startAnimating()
    }

    // MARK:- Public
    public func show() {
        if loaderOverlayView == nil {
            self.setup()
        } else {
            let indicator = loaderOverlayView.viewWithTag(1) as! UIActivityIndicatorView
            indicator.startAnimating()
        }

        if let window = UIApplication.sharedApplication().delegate?.window {
            window!.addSubview(loaderOverlayView)
            loaderOverlayView.center = window!.center
        }
    }

    public func hide() {
        let indicator = loaderOverlayView.viewWithTag(1) as! UIActivityIndicatorView
        indicator.stopAnimating()

        loaderOverlayView.removeFromSuperview()
    }
}

使用方法：显示

LoaderOverlay.shared.show()

隐藏

LoaderOverlay.shared.hide()

Answer 2

这是Obj-C而不是Swift，但我有一个旧项目，里面有这样的东西。用户界面不一样，但我确信很容易改成你想要的东西。它在深色背景上添加了一个活动指示器（旋转器）而不是刻度线。您可以从任何地方调用此代码，并在将其添加到主窗口时显示。如果您只在一个地方需要它，那么只需将其添加到呈现视图中即可。

如果要显示它，请调用此代码：

UIView *myView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 110, 100)];
myView.backgroundColor = [UIColor blackColor];
myView.alpha = 0.8;
myView.layer.cornerRadius = 8;

UIActivityIndicatorView *act = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
[myView addSubview:act];
act.center = CGPointMake(CGRectGetWidth(myView.frame)/2.0, CGRectGetHeight(myView.frame)/2.0);
[act startAnimating];

UIWindow *mainWindow = [[[UIApplication sharedApplication] delegate] window];
[mainWindow addSubview:myView];
myView.center = mainWindow.center;

使用Swift的Toast消息

2 个答案: