关于系统分享功能在iPad的崩溃问题

举例以下Swift代码

class ShareManager {
    static func share() {
        let items: [Any] = ["https://www.baidu.com"]
        let activity = UIActivityViewController(activityItems: items, applicationActivities: nil)
        UIApplication.shared.windows[0].rootViewController?.present(activity, animated: true) { }
    }
}

函数share在iPhone上运行正常，然而在iPad上运行就会崩溃，崩溃详情如下：

Terminating app due to uncaught exception 'NSGenericException', reason: 'UIPopoverPresentationController (<UIPopoverPresentationController: 0x108814c50>) should have a non-nil sourceView or barButtonItem set before the presentation occurs.'
terminating with uncaught exception of type NSException

造成崩溃的原因，是因为iPad弹出窗口采用的是popover的展示模式，该模式要求提供sourceView和sourceRect。

所以share函数代码修改如下

static func share() {
    let items: [Any] = ["https://www.baidu.com"]
    let activity = UIActivityViewController(activityItems: items, applicationActivities: nil)
    /* 针对iPad追加部分 Begin */
    if UIDevice.current.model.lowercased() == "ipad" {
        let sourceView = UIApplication.shared.windows[0].rootViewController!.view
        var frame = sourceView!.frame
        frame.size.height /= 2
        frame.origin.x = 0
        frame.origin.y = 0
        activity.popoverPresentationController?.sourceView = sourceView
        activity.popoverPresentationController?.sourceRect = frame
        activity.popoverPresentationController?.permittedArrowDirections = .up
    }
    /* 针对iPad追加部分 End */
    UIApplication.shared.windows[0].rootViewController?.present(activity, animated: true) { }
}

问题解决。

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