如何用plist從uitableview中刪除？

Question

我得到這些錯誤的，當我嘗試使用刪除與我已張貼下面的代碼：

 *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (6) must be equal to the number of rows contained in that section before the update (6), plus or minus the number of rows inserted or deleted from that section (0 inserted, 1 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out).' 

我想要使用刪除時，我按編輯按鈕。它表明我可以刪除時，當我嘗試它顯示上面的錯誤。

MainViewController.m

- (void)viewWillAppear:(BOOL)animated{ 
// Property List.plist code 
//Gets paths from root direcory. 
NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES); 
//Get documents path. 
NSString *documentsPath = [paths objectAtIndex:0]; 

//Get the path to our PList file. 
plistPath = [documentsPath stringByAppendingPathComponent:@"Servers.plist"]; 

//Check to see if Property List.plist exists in documents. 
if (![[NSFileManager defaultManager] fileExistsAtPath:plistPath]){ 
    [[NSFileManager defaultManager]copyItemAtPath:[[NSBundle mainBundle]pathForResource:@"Servers" ofType:@"plist"] toPath:plistPath error:nil]; 
    //If not in documents, get property list from main bundle. 
} 
arrayA = [[NSMutableArray alloc] initWithContentsOfFile:plistPath]; 
NSLog(@"%@\n%@", arrayA, [arrayA valueForKey:@"Hostname"]); 

tableData = [arrayA valueForKey:@"Hostname"]; 
[super viewWillAppear:animated]; 
[self.mainTableView reloadData]; 

}

- (IBAction)setEditMode:(UIBarButtonItem *)sender { 

if 
    (self.editing) 
{ 
    sender.title = @"Edit"; 
    sender.style = UIBarButtonItemStylePlain; 
    [self.mainTableView setEditing:NO animated:YES]; 
    [super setEditing:NO animated:YES]; 

} 
else 
{ 
    sender.title = @"Done"; 
    sender.style = UIBarButtonItemStyleDone; 
    [super setEditing:YES animated:YES]; 
    [self.mainTableView setEditing:YES animated:YES]; 
} 

}

- (NSInteger)tableView:(UITableView *)mainTableView numberOfRowsInSection:(NSInteger)section 
{ 

return [tableData count]; 
} 

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 

{

static NSString *cellIdentifier = @"showServerAction"; 

UITableViewCell *cell = [mainTableView dequeueReusableCellWithIdentifier:cellIdentifier]; 

if (cell == nil) { 

    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier]; 

} 

cell.textLabel.text = [tableData objectAtIndex:indexPath.row]; 

return cell; 

}

- (void)tableView:(UITableView *)mainTableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath{ 
//- (void)tableView:(UITableView *)mainTableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath { 

if (editingStyle == UITableViewCellEditingStyleDelete) { 
    [arrayA writeToFile:plistPath atomically: TRUE]; 
    [self.mainTableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; 
    [self.mainTableView reloadSections:[NSIndexSet indexSetWithIndex:indexPath.section] withRowAnimation:UITableViewRowAnimationFade]; 

} 
} 

Answer 1

它看起來像你的數據存儲在tableData，當你打電話deleteRowsAtIndexPaths，你是不是從tableData刪除相應的數據。如果您要在此表上調用reloadData，則數據不會真正消失，因爲您沒有從數據源中刪除它。我也同意馬丁R，你從數組中獲得的數據可能是不可變的。要創建你可以做類似的可變數據來源：

tableData = [[arrayA valueForKey:@"Hostname"] mutableCopy]; 

（確保資料表被聲明爲NSMutableArray的）

然後當你到commitEditingStyle，喜歡的東西刪除資料表中的數據：

[tableData removeObjectAtIndex:indexPath.row]; 

如果你允許刪除多行，你必須允許，也許通過使用removeObjectsInRange。