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iOS 发布时间：2022-03-30 发布网站：大佬教程 code.js-code.com

大佬教程收集整理的这篇文章主要介绍了iphone – Swift UIAlertController – > ActionSheet iPad iOS8崩溃，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

目前我遇到了大麻烦与我的ActionSheet。在iPhone它工作伟大，但在iPad它只是崩溃

我创建一个只有一个按钮的新项目

import UIKit

extension ViewController : UIActionSheetDelegate {

    func actionSheet(actionSheet: UIActionSheet,didDismissWithButtonIndex buttonIndex: int) {

        if actionSheet.tag == 0 {
            if buttonIndex == 1 {
                // doing something for "product page"
            } else if (buttonIndex == 2) {
                // doing something for "video"
            }
        }
    }

}

class ViewController: UIViewController,UIActionSheetDelegate {
    @IBACtion func test(sender: AnyObject) {

        let systemVersion: NSInteger = (UIDevice.currentDevice().systemVersion as NSString).IntegerValue
        if systemVersion < 8 {
            // iOS7:
            let action:UIActionSheet = UIActionSheet(title: "Change Map Type",delegate: self,cancelButtontitle: "BACk",destructiveButtontitle: nil,otherButtontitles: "Product Page","Video")
            action.tag = 0
            action.showInView(self.view)
        } else {
            // iOS8:
            let alertController: UIAlertController = UIAlertController(title: "Change Map Type",message: nil,preferredStyle: UIAlertControllerStyle.ActionSheet)
            let cancelAction: UIAlertAction = UIAlertAction(title: "BACk",style: UIAlertActionStyle.Cancel,handler: nil)
            let button1action: UIAlertAction = UIAlertAction(title: "Product Page",style: UIAlertActionStyle.Default,handler: { (action: UIAlertAction!) -> () in
                // doing something for "product page"
            })
            let button2action: UIAlertAction = UIAlertAction(title: "Video",handler: { (action: UIAlertAction!) -> () in
                // doing something for "video"
            })
            alertController.addAction(cancelAction)
            alertController.addAction(button1action)
            alertController.addAction(button2action)

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

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view,typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

因为我伤心在iphone它的工作，但如果我点击iPad上的按钮应用程序崩溃

项目可以在https://www.dropbox.com/s/54jqd8nsc67ll5g/test.zip?dl=0找到下载并尝试。

解决方法

错误消息告诉您，您需要给警报控制器的popoverPresentationController一个位置，以便它可以正确定位本身。这很容易做 – 只需检查是否有一个popover控制器，并添加发件人作为源。

如果你的按钮是一个UIBarButtonItem：

if let popoverController = alertController.popoverPresentationController {
    popoverController.barButtonItem = sender
}
self.presentViewController(alertController,completion: nil)

除此以外：

if let popoverController = alertController.popoverPresentationController {
    popoverController.sourceView = sender
    popoverController.sourceRect = sender.bounds
}
self.presentViewController(alertController,completion: nil)