好的，所以我让我的ActivityViewController在像平常一样共享时工作正常，但是每当用户在调用ActivityViewController之后点击cancel时，我就会得到一个恼人的致命错误。
fatal error: unexpectedly found nil while unwrapping an Optional value
所以看起来我没有很好地打开我的选项。分享方法如下：
@IBAction func share(sender: UIBarButtonItem) {
var memeedimage = generateMemedImage()
let activityViewController = UIActivityViewController(activityItems:[memeedimage] , applicationActivities: nil)
presentViewController(activityViewController, animated: true, completion: nil)
activityViewController.completionWithItemsHandler = {
(activity, success, returneditems, error) in
println("Activity: \(activity) Success: \(success) Items: \(returneditems) Error: \(error)")
self.save()
activityViewController.dismissViewControllerAnimated(true, completion:{
let memevc:MemeTableViewController = MemeTableViewController()
self.presentViewController(memevc, animated: true, completion: nil)
})
}
share方法调用save函数，该函数使用隐式展开的可选选项生成名为meme的对象，这会导致错误：
func save(){
var meme : MemeObject!
meme = MemeObject(textFieldtop : texfieldtop.text! ,textFieldbottom : textfieldbottom.text! ,image : imagePickerView.image! , memedImage : generateMemedImage())
(UIApplication.sharedApplication().delegate as! AppDelegate).memes.append(meme!)
}
所以我决定安全地打开meme可选值，但这引发了另一个问题
func save(){
var meme : MemeObject?
if let memez = meme{
meme = MemeObject(textFieldtop : texfieldtop.text! ,textFieldbottom : textfieldbottom.text! ,image : imagePickerView.image! , memedImage : generateMemedImage())
(UIApplication.sharedApplication().delegate as! AppDelegate).memes.append(meme!)
}
else{
println("Optionals man")
}
}
现在，当对象不是nil时，将打印“Optionals man”，这是不应该发生的，share方法中的completionwithitemshandler属性没有显示应该在用户共享对象之后直接发生的表视图控制器。
MemeTableViewController的代码：
import UIKit
class MemeTableViewController : UIViewController,UITableViewDelegate,UITableViewDataSource
{
var memesz: [MemeObject]!
@IBOutlet var tableView: UITableView!
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
memesz = appDelegate.memes
//tableView.reloadData()
}
override func viewDidLoad() {
super.viewDidLoad()
navigationController?.hidesBarsOnSwipe = true
navigationController?.hidesBarsOnTap = true
}
//reserves the number of rows needed to display the image
func tableView(tableView : UITableView, numberOfRowsInSection section : Int)->Int
{
return memesz.count
}
//Reserves the row to be dequeued for display
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell:TableViewzCell = tableView.dequeueReusableCellWithIdentifier("MemesCell", forIndexPath: indexPath) as! TableViewzCell
let memezrow = memesz[indexPath.row]
cell.label1.text = memezrow.textFieldtop
cell.label2.text = memezrow.textFieldbottom
cell.imageview.image = memezrow.memedImage
return cell
}
//Method to do something when the row is selected
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let detailController = self.storyboard!.instantiateViewControllerWithIdentifier("FullScreenMeme") as! FullScreenMeme
detailController.meme = memesz[indexPath.row]
self.navigationController!.pushViewController(detailController, animated: true)
}
}
有什么帮助吗？
最佳答案
在查看了代码之后，似乎还没有初始化变量“meme”。
func save(){
var meme : MemeObject? = MemeObject(textFieldtop : texfieldtop.text! ,textFieldbottom : textfieldbottom.text! ,image : imagePickerView.image! , memedImage : generateMemedImage())
if let memez = meme{
(UIApplication.sharedApplication().delegate as! AppDelegate).memes.append(meme!)
}
else{
println("Optionals man")
}
}
}
@IBAction func share(sender: UIBarButtonItem) {
var memeedimage = generateMemedImage()
let activityViewController = UIActivityViewController(activityItems:[memeedimage] , applicationActivities: nil)
presentViewController(activityViewController, animated: true, completion: nil)
activityViewController.completionWithItemsHandler = {
(activity, success, returneditems, error) in
println("Activity: \(activity) Success: \(success) Items: \(returneditems) Error: \(error)")
self.save()
let memevc = self.storyboard!.instantiateViewControllerWithIdentifier("MemeTableViewConroller") as! MemeTableViewController
self.presentViewController(memevc, animated: true, completion: nil)
}
}
关于ios - 快速取消ActivityViewController会导致致命错误，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/30966988/