NSUserDefaults没有保存(NSUserDefaults not saving)

 我正在尝试保存一些数据，并在不同控制器的tableview中调用它，但它不起作用。 我在某种程度上也失去了一个变量值，就像我在视图控制器中更改它时类别var变回零一样。 
 
 在我的NewEntry.m中，我有： 
 
-(IBAction)saveButton:(id)sender {    

    int i = selectedSegment.selectedSegmentIndex;    

    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

    [userDefaults setInteger:i  forKey:@"category"];

    [userDefaults synchronize];

    if (selectedSegment.selectedSegmentIndex == 0) {
        [userDefaults setObject:titlefield.text forKey:@"titletexthomework"];
        [userDefaults setObject:detailstextfield.text forKey:@"detailshomework"];
    }
    else if(selectedSegment.selectedSegmentIndex == 1) {
        [userDefaults setObject:titlefield.text forKey:@"titletextprojects"];
        [userDefaults setObject:detailstextfield.text forKey:@"detailsprojects"];

    }
    else if (selectedSegment.selectedSegmentIndex == 2){
        [userDefaults setObject:titlefield.text forKey:@"titletextappointments"];
        [userDefaults setObject:detailstextfield.text forKey:@"detailsappointments"];
    }
    else if (selectedSegment.selectedSegmentIndex == 3){
        [userDefaults setObject:titlefield.text forKey:@"titletextevents"];
        [userDefaults setObject:detailstextfield.text forKey:@"detailsevents"];

    }

    else if (selectedSegment.selectedSegmentIndex == 4){
        [userDefaults setObject:titlefield.text forKey:@"titletexttodolist"];
        [userDefaults setObject:detailstextfield.text forKey:@"detailstodolist"];
    }

    [userDefaults synchronize];
    NSLog(@"selected segment %i", i);
}
 
 然后在我的Projects.m中我有： 
 
-(void)viewDidLoad
{
    [super viewDidLoad];    

    categoryselected = [[NSUserDefaults standardUserDefaults] integerForKey:@"category"];
    NSLog(@"category selected %i", categoryselected);        

    titlestring = [[NSUserDefaults standardUserDefaults]  objectForKey:@"titletextprojects"];
    detailsstring = [[NSUserDefaults standardUserDefaults] objectForKey:@"detailsprojects"];        

    tabledata = [[NSArray alloc] initWithObjects:titlestring, nil];
    tablesubtitles = [[NSArray alloc] initWithObjects:detailsstring, nil];    
}

//-------------------------------------------------------
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
{    
    UITableViewCell *cell = nil;

    cell = [tableView dequeueReusableCellWithIdentifier:@"projectscell"];   

    if(cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"projectscell"];
    }

    cell.textLabel.text = [tabledata objectAtIndex:indexPath.row];
    cell.detailTextLabel.text = [tablesubtitles objectAtIndex:indexPath.row];
    cell.textLabel.font = [UIFont systemFontOfSize:14.0];
    cell.textLabel.backgroundColor = [ UIColor clearColor ];
    cell.detailTextLabel.backgroundColor = [UIColor clearColor];

    return cell;
}
 
 ** * ** * * 更新 * ** * ** * ** * ** * * 
 
 我将填充表的部分更改为静态字符串，如下所示： 
 
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
{
tabl = [[NSArray alloc] initWithObjects:@"hello", nil];
NSLog(@"tabledata %@", tabledata );
tab = [[NSArray alloc] initWithObjects:@"hello2", nil];
NSLog(@"details %@", tablesubtitles);



UITableViewCell *cell = nil;

cell = [tableView dequeueReusableCellWithIdentifier:@"projectscell"];


if(cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"projectscell"];

}
cell.textLabel.text = [tabl objectAtIndex:indexPath.row];
cell.detailTextLabel.text = [tab objectAtIndex:indexPath.row];
cell.textLabel.font = [UIFont systemFontOfSize:14.0];
cell.textLabel.backgroundColor = [ UIColor clearColor ];
cell.detailTextLabel.backgroundColor = [UIColor clearColor];
 
 表格仍显示空白。 谢谢您的帮助。 

I'm trying to save some data and call it back in a tableview from a different controller but it doesn't working. I'm somehow losing a variable value as well, like the category var changes back to zero when I change it in a view controller, any of them.
 
In my NewEntry.m I have:
 
-(IBAction)saveButton:(id)sender {    

    int i = selectedSegment.selectedSegmentIndex;    

    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

    [userDefaults setInteger:i  forKey:@"category"];

    [userDefaults synchronize];

    if (selectedSegment.selectedSegmentIndex == 0) {
        [userDefaults setObject:titlefield.text forKey:@"titletexthomework"];
        [userDefaults setObject:detailstextfield.text forKey:@"detailshomework"];
    }
    else if(selectedSegment.selectedSegmentIndex == 1) {
        [userDefaults setObject:titlefield.text forKey:@"titletextprojects"];
        [userDefaults setObject:detailstextfield.text forKey:@"detailsprojects"];

    }
    else if (selectedSegment.selectedSegmentIndex == 2){
        [userDefaults setObject:titlefield.text forKey:@"titletextappointments"];
        [userDefaults setObject:detailstextfield.text forKey:@"detailsappointments"];
    }
    else if (selectedSegment.selectedSegmentIndex == 3){
        [userDefaults setObject:titlefield.text forKey:@"titletextevents"];
        [userDefaults setObject:detailstextfield.text forKey:@"detailsevents"];

    }

    else if (selectedSegment.selectedSegmentIndex == 4){
        [userDefaults setObject:titlefield.text forKey:@"titletexttodolist"];
        [userDefaults setObject:detailstextfield.text forKey:@"detailstodolist"];
    }

    [userDefaults synchronize];
    NSLog(@"selected segment %i", i);
}
 
then in my Projects.m I have:
 
-(void)viewDidLoad
{
    [super viewDidLoad];    

    categoryselected = [[NSUserDefaults standardUserDefaults] integerForKey:@"category"];
    NSLog(@"category selected %i", categoryselected);        

    titlestring = [[NSUserDefaults standardUserDefaults]  objectForKey:@"titletextprojects"];
    detailsstring = [[NSUserDefaults standardUserDefaults] objectForKey:@"detailsprojects"];        

    tabledata = [[NSArray alloc] initWithObjects:titlestring, nil];
    tablesubtitles = [[NSArray alloc] initWithObjects:detailsstring, nil];    
}

//-------------------------------------------------------
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
{    
    UITableViewCell *cell = nil;

    cell = [tableView dequeueReusableCellWithIdentifier:@"projectscell"];   

    if(cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"projectscell"];
    }

    cell.textLabel.text = [tabledata objectAtIndex:indexPath.row];
    cell.detailTextLabel.text = [tablesubtitles objectAtIndex:indexPath.row];
    cell.textLabel.font = [UIFont systemFontOfSize:14.0];
    cell.textLabel.backgroundColor = [ UIColor clearColor ];
    cell.detailTextLabel.backgroundColor = [UIColor clearColor];

    return cell;
}
 
*******UPDATE**************
 
I Changed the part that populates the table to static string like this:
 
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
{
tabl = [[NSArray alloc] initWithObjects:@"hello", nil];
NSLog(@"tabledata %@", tabledata );
tab = [[NSArray alloc] initWithObjects:@"hello2", nil];
NSLog(@"details %@", tablesubtitles);



UITableViewCell *cell = nil;

cell = [tableView dequeueReusableCellWithIdentifier:@"projectscell"];


if(cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"projectscell"];

}
cell.textLabel.text = [tabl objectAtIndex:indexPath.row];
cell.detailTextLabel.text = [tab objectAtIndex:indexPath.row];
cell.textLabel.font = [UIFont systemFontOfSize:14.0];
cell.textLabel.backgroundColor = [ UIColor clearColor ];
cell.detailTextLabel.backgroundColor = [UIColor clearColor];
 
And the table still shows up blank. Thanks For the help.

原文：https://stackoverflow.com/questions/9417651