ios - NSUserDefaults 只保存最后输入的数据

Question

我在 ViewController2 中单击按钮时使用 NSUserDefaults 保存文本字段文本 我的代码是

ButtonClick()
{
    NSUserDefaults *userDefaults =[NSUserDefaults standardUserDefaults];
    [userDefaults setObject:keyWordField.text forKey:@"Keywords"];
    [userDefaults synchronize];
}

Then ViewDidLoad method i am Retrieving like this
-(void)viewDidLoad
{

NSUserDefaults *userDefaults =[NSUserDefaults standardUserDefaults];
[keyWordArray addObject:[userDefaults objectForKey:@"Keywords"]];
[userDefaults synchronize];

}

这里我将这个 keyWordArray 分配给 tableview像 cell.textlabel.text =[keyWordArray objectAtIndex:indexPath.row];

First i entered text(First) in textfield and click button it is showing in table like
     First
Second time i entered text (second) in textfield and click button it is showing table like
      First
      Second
Here everything working fine. The problem is when i come to viewController2 from ViewController1. It is showing last entered value only 
like
      Second

这里出了什么问题？

Answer 1

试试这个

- (IBAction)buttonclick:(id)sender {

[keyWordArray addObject:keyWordField.text];
NSUserDefaults *userDefaults =[NSUserDefaults standardUserDefaults];
[userDefaults setObject:keyWordArray forKey:@"Keywords"];
[userDefaults synchronize];
[selt.tableView reload];  //reload the table every time a new text is added
}

-(void)viewDidLoad {
 if([[NSUserDefaults standardUserDefaults] objectForKey:@"Keywords"]==nil){
  keyWordArray = [[NSMutableArray alloc] init];
 }
 else{
 keyWordArray = [[NSUserDefaults standardUserDefaults] objectForKey:@"Keywords"];
 }
}