目前我遇到了ActionSheet的大麻烦。在iPhone上它运行良好，但在iPad上只会崩溃。
我创建了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", style: UIAlertActionStyle.Default, 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.
}
}
* Terminating app due to uncaught exception 'NSGenericException', reason: 'Your application has presented a UIAlertController () of style UIAlertControllerStyleActionSheet. The modalPresentationStyle of a UIAlertController with this style is UIModalPresentationPopover. You must provide location information for this popover through the alert controller's popoverPresentationController. You must provide either a sourceView and sourceRect or a barButtonItem. If this information is not known when you present the alert controller, you may provide it in the UIPopoverPresentationControllerDelegate method -prepareForPopoverPresentation.' * 项目可以在https://www.dropbox.com/s/54jqd8nsc67ll5g/test.zip?dl=0 下载和尝试。