我有一个tableview,每个单元格内的数据都是NSMutableArray。我想在每次向左滑动时删除一行tableview并按下删除按钮。但是使用NSMutableArray很困难。每当我输入代码toDoItems.removeObjectAtIndex(indexPath.row)
时,我都会得到一个Sigabrt。
我得到的错误是
使用NSException类型的未捕获异常终止' NSInternalInconsistencyException',原因:' - [__ NSCFArray removeObjectAtIndex:]:发送到不可变对象的变异方法'
有关此问题的任何帮助吗?
以下是与问题相关的代码。
包含toDoItems的ViewDidLoad代码:
let userDefaults:NSUserDefaults = NSUserDefaults.standardUserDefaults()
let itemListFromUserDefaults:NSMutableArray? = userDefaults.objectForKey("itemList") as? NSMutableArray
if ((itemListFromUserDefaults) != nil){
toDoItems = itemListFromUserDefaults!
}
我的NSMutableArray变量
var toDoItems:NSMutableArray! = NSMutableArray()
我的commitEditingStyle函数:
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath){
if(editingStyle == UITableViewCellEditingStyle.Delete){
//This code gives me the error and Sigabrt
toDoItems.removeObjectAtIndex(indexPath.row)
tbl?.reloadData();
}
我的numberOfRowsInSection函数:
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
return toDoItems.count
}
我的cellForRowAtIndexPath函数:
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) ->
UITableViewCell{
let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! TableView
let toDoItem:NSDictionary = toDoItems.objectAtIndex(indexPath.row) as! NSDictionary
cell.lbl.text = toDoItem.objectForKey("itemTitel") as? String
return cell
}
这是错误
MyPlanner [12373:461118] *由于未捕获的异常终止应用程序' NSInternalInconsistencyException',原因:' - [__ NSCFArray removeObjectAtIndex:]:发送到不可变对象的变异方法' * 第一次抛出调用堆栈: ( 0 CoreFoundation 0x0000000109df3d85 exceptionPreprocess + 165 1 libobjc.A.dylib 0x0000000109867deb objc_exception_throw + 48 2 CoreFoundation 0x0000000109df3cbd + [NSException raise:format:] + 205 3 CoreFoundation 0x0000000109de9dae - [__ NSCFArray removeObjectAtIndex:] + 94 4 MyPlanner 0x0000000109210c53 _TTSf4dg_n_g_n___TFC9MyPlanner14ViewController9tableViewfTCSo11UITableView18commitEditingStyleOSC27UITableViewCellEditingStyle17forRowAtIndexPathCSo11NSIndexPath_T_ + 131 5 MyPlanner 0x000000010920fc3d _TToFC9MyPlanner14ViewController9tableViewfTCSo11UITableView18commitEditingStyleOSC27UITableViewCellEditingStyle17forRowAtIndexPathCSo11NSIndexPath_T_ + 61 6 UIKit 0x000000010ac124c0 - [UITableView animateDeletionOfRowWithCell:] + 205 7 UIKit 0x000000010abe7a3e __52- [UITableView _swipeActionButtonsForRowAtIndexPath:] _ block_invoke + 80 8 UIKit 0x000000010ac13eaa - [UITableView _actionButton:pushInCell:] + 172 9 UIKit 0x000000010ae3aae6 - [UITableViewCell _actionButtonPushed:] + 82 10 UIKit 0x000000010aab4a8d - [UIApplication sendAction:to:from:forEvent:] + 92 11 UIKit 0x000000010ac27e67 - [UIControl sendAction:to:forEvent:] + 67 12 UIKit 0x000000010ac28143 - [UIControl _sendActionsForEvents:withEvent:] + 327 13 UIKit 0x000000010ac27263 - [UIControl touchesEnded:withEvent:] + 601 14 UIKit 0x000000010af9cc52 _UIGestureRecognizerUpdate + 10279 15 UIKit 0x000000010ab2748e - [UIWindow _sendGesturesForEvent:] + 1137 16 UIKit 0x000000010ab286c4 - [UIWindow sendEvent:] + 849 17 UIKit 0x000000010aad3dc6 - [UIApplication sendEvent:] + 263 18 UIKit 0x000000010aaad553 _UIApplicationHandleEventQueue + 6660 19 CoreFoundation 0x0000000109d19301 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17 20 CoreFoundation 0x0000000109d0f22c __CFRunLoopDoSources0 + 556 21 CoreFoundation 0x0000000109d0e6e3 __CFRunLoopRun + 867 22 CoreFoundation 0x0000000109d0e0f8 CFRunLoopRunSpecific + 488 23 GraphicsServices 0x000000010ec78ad2 GSEventRunModal + 161 24 UIKit 0x000000010aab2f09 UIApplicationMain + 171 25 MyPlanner 0x00000001092134fd main + 125 26 libdyld.dylib 0x000000010d43d92d start + 1 ) libc ++ abi.dylib:以NSException类型的未捕获异常终止 (LLDB)
以下是我在toDoItems中添加信息(添加项目)的代码。
@IBAction func ClickedforSelection(sender: AnyObject) {
if delegate != nil {
let information : NSString = txt1.text!
delegate!.userDidEntredInformation(information)
}
let userDefaults:NSUserDefaults = NSUserDefaults.standardUserDefaults()
var itemList:NSMutableArray? = userDefaults.objectForKey("itemList") as? NSMutableArray
let dataSet:NSMutableDictionary = NSMutableDictionary()
dataSet.setObject(txt.text!, forKey: "itemTitel")
if ((itemList) != nil){ // data already available
let newMutableList:NSMutableArray = NSMutableArray();
for dict:AnyObject in itemList!{
newMutableList.addObject(dict as! NSDictionary)
}
userDefaults.removeObjectForKey("itemList")
newMutableList.addObject(dataSet)
userDefaults.setObject(newMutableList, forKey: "itemList")
}else{ // This is the first todo item in the list
userDefaults.removeObjectForKey("itemList")
itemList = NSMutableArray()
itemList!.addObject(dataSet)
userDefaults.setObject(itemList, forKey: "itemList")
}
userDefaults.synchronize()
答案 0 :(得分:2)
NSUserDefaults
objectForKey
将始终返回不可变对象。简单地向下投射它不会使它变得可变。您需要从返回的不可变数组创建一个可变数组:
let userDefaults:NSUserDefaults = NSUserDefaults.standardUserDefaults()
if let itemListFromUserDefaults = userDefaults.objectForKey("itemList") as? NSArray
toDoItems = itemListFromUserDefaults.mutableCopy()
}