我该如何添加分享按钮？IOS8中使用Swift。

Question

我希望我的应用程序中有一个按钮，当按下它时，这个（见下图）弹出。我该怎么做？我不想创建自定义共享扩展，我只想要默认的。我应该使用什么代码？所有在线教程都是用Objective-C编写的。请用Swift给出答案。

图像：http://9to5mac.com/2014/06/30/hands-on-1password-beta-shows-off-ios-8s-touch-id-extensions-apis-video/#jp-carousel-330420 以下是我的代码，但我收到一个错误，即UIBarButtonItem无法转换为UIVIew。为什么？该操作连接到导航栏按钮项？

@IBAction func ActionButton(sender: UIBarButtonItem) {

    let firstActivityItem = "Text you want"
    let secondActivityItem : NSURL = NSURL(string: "http//:urlyouwant")!
    // If you want to put an image
    let image : UIImage = UIImage(named: "TALogo")!

    let activityViewController : UIActivityViewController = UIActivityViewController(
        activityItems: [firstActivityItem, secondActivityItem, image], applicationActivities: nil)

    // This lines is for the popover you need to show in iPad
    activityViewController.popoverPresentationController?.sourceView = (sender as! UIBarButtonItem)

    // This line remove the arrow of the popover to show in iPad
    activityViewController.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection.allZeros
    activityViewController.popoverPresentationController?.sourceRect = CGRect(x: 150, y: 150, width: 0, height: 0)

    // Anything you want to exclude
    activityViewController.excludedActivityTypes = [
        UIActivityTypePostToWeibo,
        UIActivityTypePrint,
        UIActivityTypeAssignToContact,
        UIActivityTypeSaveToCameraRoll,
        UIActivityTypeAddToReadingList,
        UIActivityTypePostToFlickr,
        UIActivityTypePostToVimeo,
        UIActivityTypePostToTencentWeibo
    ]

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



}

- nachshon fertel

Answer 1

方法是使用UIActivityViewController，例如以下方式：

@IBAction func shareSheet(sender: AnyObject) {

    let firstActivityItem = "Text you want"
    let secondActivityItem : NSURL = NSURL(string: "http//:urlyouwant")!
    // If you want to put an image
    let image : UIImage = UIImage(named: "image.jpg")!

    let activityViewController : UIActivityViewController = UIActivityViewController(
        activityItems: [firstActivityItem, secondActivityItem, image], applicationActivities: nil)

    // This lines is for the popover you need to show in iPad 
    activityViewController.popoverPresentationController?.sourceView = (sender as! UIButton)

    // This line remove the arrow of the popover to show in iPad
    activityViewController.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection.allZeros
    activityViewController.popoverPresentationController?.sourceRect = CGRect(x: 150, y: 150, width: 0, height: 0)

    // Anything you want to exclude
    activityViewController.excludedActivityTypes = [
        UIActivityTypePostToWeibo,
        UIActivityTypePrint,
        UIActivityTypeAssignToContact,
        UIActivityTypeSaveToCameraRoll,
        UIActivityTypeAddToReadingList,
        UIActivityTypePostToFlickr,
        UIActivityTypePostToVimeo,
        UIActivityTypePostToTencentWeibo
    ]

    self.presentViewController(activityViewController, animated: true, completion: nil)
}

上述代码适用于iPhone和iPad，因为在iOS 8中设置新的popoverPresentationController也适用于iPad。

如果使用UIBarButtonItem，则需要替换以下行：

activityViewController.popoverPresentationController?.sourceView = (sender as! UIButton)

使用这个：

activityViewController.popoverPresentationController?.barButtonItem = (sender as! UIBarButtonItem)

我希望这能对您有所帮助。

- Victor Sigler

---

请重新阅读我的回答，我在注释中写明了适用于iPad，它适用于两种情况。 - Victor Sigler

这个应用在iPad上使用时崩溃了，为什么？ - nachshon fertel

Facebook和Twitter可以与我上面的代码很好地配合使用，分享文本、链接和图片都没问题。但要小心Facebook，因为它在应用程序下载等方面可能会出现一些问题。这只发生在Facebook上，因为其政策发生了变化！ - Victor Sigler

我尝试这样做，但是出现了一个错误，提示：“UIBarButtonItem无法转换为UIVIew”。请参考更新后的问题。 - nachshon fertel

在视图具有UIBarButtonItem的情况下，popoverPresentationController有一个名为barButtonItem的属性。 - Victor Sigler