共享按钮在 iPhone 上完美运行，但在 iPad 上崩溃

Question

我正在尝试添加一个按钮，以便在 Twitter、Facebook 等中分享一些句子。这一切都适用于所有 iPhone 模型，但模拟器崩溃并出现 iPad。

这是我的代码：

@IBAction func shareButton(sender: AnyObject) {
    frase = labelFrases.text!
    autor = labelAutores.text!

    var myShare = "\(frase) - \(autor)"
    
    let activityVC: UIActivityViewController = UIActivityViewController(activityItems: [myShare], applicationActivities: nil)

    self.presentViewController(activityVC, animated: true, completion: nil)

这是错误：

Terminating app due to uncaught exception 'NSGenericException', reason: 'UIPopoverPresentationController (<_UIAlertControllerActionSheetRegularPresentationController: 0x7c0f9190>) should have a non-nil sourceView or barButtonItem set before the presentation occurs

我该如何解决？

Answer 1

对于ipad (iOS > 8.0) 你需要设置popoverPresentationController:

//check ipad
if (UIDevice.currentDevice().userInterfaceIdiom == UIUserInterfaceIdiom.Pad)
{
    //ios > 8.0
    if ( activityVC.respondsToSelector(Selector("popoverPresentationController"))){
        activityVC.popoverPresentationController?.sourceView = super.view
    }
}

self.presentViewController(activityVC, animated: true, completion: nil)

更多信息在这里： UIActivityViewController crashing on iOS 8 iPads

Answer 2

为 Swift 5 执行此操作，以使共享按钮在 iPad 和 iPhone 上都有效：

@IBAction func shareButton(sender: UIButton) { {
    let itemToShare = ["Some Text goes here"]
    let avc = UIActivityViewController(activityItems: itemToShare, applicationActivities: nil)
    
    //Apps to be excluded sharing to
    avc.excludedActivityTypes = [
        UIActivityType.print,
        UIActivityType.addToReadingList
    ]
    // Check if user is on iPad and present popover
    if UIDevice.current.userInterfaceIdiom == .pad {
        if avc.responds(to: #selector(getter: UIViewController.popoverPresentationController)) {
            avc.popoverPresentationController?.barButtonItem = sender
        }
    }
    // Present share activityView on regular iPhone
    self.present(avc, animated: true, completion: nil)
}

希望对您有所帮助！

共享按钮在 iPhone 上完美运行，但在 iPad 上崩溃

Sharing button works perfectly on iPhone but crash on iPad

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swift