Objective c 保存UITextfield信息时出现问题

当我尝试使用NSUserdefaults保存UITextFields信息时出现问题（崩溃）。我知道这与我正在使用的数组有关。代码如下：

- (IBAction)generateNumbers 
{
    // release and remove everyting from the name array
    //    [nameArray release];
    nameArray = nil;

    // reinitilize the name array
    nameArray = [[NSMutableArray alloc] init];

    // Loop through the textfields to get the names into the nameArray
    for (int textFieldCount = 0; textFieldCount<[textFieldArray count]; textFieldCount++) {
        [nameArray addObject:[[textFieldArray objectAtIndex:textFieldCount] text]];
    }

    // Randomly sort the names in the array
    [nameArray sortUsingFunction:randomSort context:nil];

    // Add the random names back into the text fields
    for (int textFieldCount = 0; textFieldCount<[textFieldArray count]; textFieldCount++) {
        [[textFieldArray objectAtIndex:textFieldCount] setText:[nameArray     objectAtIndex:textFieldCount]];
    }
}

      int randomSort(id obj1, id obj2, void *context ) {
         // returns random number -1 0 1
       return (arc4random()%3 - 1);
} 

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保存数据时不要忘记使用方法：

[[NSUserDefaults standardUserDefaults] synchronize];

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请修改代码。它甚至不会编译什么样的崩溃错误？text1在哪里声明？您使用的是ARC吗？在我添加NSUserdefaults以保存信息之前，一切正常。以下是我收到的错误消息：**由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：'***-[\uu NSArrayM insertObject:atIndex:]：对象不能为零

 - (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
        [[NSUserDefaults standardUserDefaults] setObject:tex1.text forKey:@"storedTextValue48"];

[[NSUserDefaults standardUserDefaults] synchronize];