UITableView选中标记仅选一个

我使用下面的代码将UITableViewCell的附件设置为复选标记，然后写入NSUserDefaults。但它似乎没有正常工作。 NSUserDefault似乎从未设置。如果你能看到问题，请指出。UITableView选中标记仅选一个

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { 
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath]; 
NSString *text = [array objectAtIndex:indexPath.row]; 
if (cell.accessoryType == UITableViewCellAccessoryNone) { 
    cell.accessoryType = UITableViewCellAccessoryCheckmark; 
    if (cell.accessoryType == UITableViewCellAccessoryCheckmark) { 
     if ([text isEqualToString:[NSString stringWithFormat:@"%i", k10]]) { 
      [defaults setInteger:k10 forKey:kNumberOfChartsToDownload]; 
     } else if ([text isEqualToString:[NSString stringWithFormat:@"%i", k25]]) { 
      [defaults setInteger:k25 forKey:kNumberOfChartsToDownload]; 
     } else if ([text isEqualToString:[NSString stringWithFormat:@"%i", k50]]) { 
      [defaults setInteger:k50 forKey:kNumberOfChartsToDownload]; 
     } else if ([text isEqualToString:[NSString stringWithFormat:@"%i", k75]]) { 
      [defaults setInteger:k75 forKey:kNumberOfChartsToDownload]; 
     } else if ([text isEqualToString:[NSString stringWithFormat:@"%i", k100]]) { 
      [defaults setInteger:k100 forKey:kNumberOfChartsToDownload]; 
     } 
    } 
    [self.navigationController popViewControllerAnimated:YES]; 
} 
else if (cell.accessoryType == UITableViewCellAccessoryCheckmark) { 
    cell.accessoryType = UITableViewCellAccessoryNone; 
} 
[tableView deselectRowAtIndexPath:indexPath animated:YES]; 

// Navigation logic may go here. Create and push another view controller. 
/* 
<#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil]; 
// ... 
// Pass the selected object to the new view controller. 
[self.navigationController pushViewController:detailViewController animated:YES]; 
[detailViewController release]; 
*/ 
}

我也NSLogging应用程序启动时的NSUserDefault。然而，整数是总是100.如果你能看到问题，请做同样的事情。

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; 
if (! [defaults objectForKey:@"firstRun"]) { 
    [defaults setObject:[NSDate date] forKey:@"firstRun"]; 
} 
NSInteger daysSinceInstall = [[NSDate date] timeIntervalSinceDate:[defaults objectForKey:@"firstRun"]]/86400; 
if (! [defaults objectForKey:@"first"]) { 
    [defaults setObject:[NSDate date] forKey:@"first"]; 
} 
if (daysSinceInstall == 0 && [defaults boolForKey:@"askedForSettings"] == NO) { 
    if (![defaults integerForKey:kNumberOfChartsToDownload]) { 
     NSLog(@"no defaults"); 
     [defaults setInteger:k25 forKey:kNumberOfChartsToDownload]; 
    } else if ([defaults integerForKey:kNumberOfChartsToDownload]) { 
     NSLog(@"%i", [defaults integerForKey:kNumberOfChartsToDownload]); 
    } 
    [defaults setBool:YES forKey:@"askedForSettings"]; 
}

来源

2011-02-27 max_

默认情况下，NSUserDefaults会在应用程序从内存中卸载之前保存。我遇到的一个问题是，如果你从Xcode中退出应用程序，那么不会调用各种清理方法。完成将对象保存为默认值后，将[[NSUserDefaults standardUserDefaults] synchronize];添加到您的代码中。这应该强制NSUserDefaults当时保存任何未保存的更改。

来源

2011-02-27 16:45:43

UITableView选中标记仅选一个

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