通过的tableview细胞删除NSUserDefault的对象

Question

我有被存储在NSUserDefaults的最爱，单收藏存储通过NSDictionary的列表：

NSUserDefaults *userPref = [NSUserDefaults standardUserDefaults]; 

NSMutableDictionary *bookmark = [NSMutableDictionary new]; 

[bookmark setValue:author.text forKey:@"author"]; 
[bookmark setValue:book.text forKey:@"book"]; 
[bookmarks addObject:bookmark]; 

[userPref setObject:bookmarks forKey:@"bookmarks"]; 
[userPref synchronize]; 

一切都OK了，但现在我想删除一个单一的最爱与细胞的轻扫。我添加了显示删除刷卡的方法，但我不知道如何从nsuserdefaults中删除单个书签。

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

NSUInteger row = [indexPath row]; 
[self.listBookamrks removeObjectAtIndex:row]; 
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] 
       withRowAnimation:UITableViewRowAnimationFade]; 
} 

Answer 1

NSUserDefaults *userPref = [NSUserDefaults standardUserDefaults]; 

    NSMutableDictionary *storedBookMark = [[userPref ObjectForKey:@"bookmarks"]mutable copy]; 

// If you want to remove an object from the dictionary 

[storedBookMark removeObjectForKey:@"Your KEy"]; 

// if you want to empty the dictionary 

    [storedBookMark removeAllObjects]; 


    [userPref setObject: storedBookMark forKey:@"bookmarks"]; 

    [userPref synchronize]; 

// if you want to store nil // go back to default state .. 


    [userPref setNilValueForKey:@"bookmarks];