iphone - 随机排列测验问题？

Question

我一直在努力解决如何在 NSarray 中整理问题的问题。我希望它从 NSarray 中取出 10 个问题，其中有 50 个问题，然后将其删除，这样在其他 40 个问题完成之前它们就不会再次显示。我的 NSarray 应该如下所示:

{
    NSArray *quizArray = [[NSArray alloc] initWithObjects: 

     @"How much was David Beckham's deal worth upon signing for LA Galaxy?", @"$250m", @"$32.5m", @"$75m", @"$502m", @"3",

     @"In which year did David beckham sign for LA Galaxy?", @"2006", @"2007", @"2008", @"2009", @"2",

     @"In 2008, Rice-Eccles Stadium housed which MLS team for their home games?", @"Toronto FC", @"Real Salt Lake", @"Colorado Rapids", @"Houstion Dynamo", @"2",

     @"Which of these teams, won the first MLS Cup?", @"Chicago Fire", @"Colorado Rapids", @"DC United", @"LA Galaxy", @"3",

     @"Wich of these players have the record for most goals in a game?", @"Mamadou Diallo", @"Marco Etcheverry", @"Cobi Jones", @"Clint Mathis", @"4", nil];

    self.theQuiz = quizArray;
    [quizArray release];
}

我在网上搜索了近两周，希望有人能帮助我! :)

Answer 1

我以前也遇到过同样的问题。我最终创建了一个名为“MyQuestion”的新类。它的属性是一个代表问题的 NSString、一个代表不同答案的 NSMutableArray 和一个 int 作为 Tag。

然后你有一个“MyQuestion”的 NSMutableArray。对象，以及用于打乱此数组的方法:

- (NSMutableArray *)shuffleMutableArray:(NSMutableArray *)newMutableArray{

BOOL seeded = NO;
if(!seeded)
{
    srandom(time(NULL));
}

NSUInteger count = [newMutableArray count];
for (NSUInteger i = 0; i < count; ++i) {

    // Select a random element between i and end of array to swap with.
    int nElements = count - i;
    int n = (arc4random() % nElements) + i;
    [newMutableArray exchangeObjectAtIndex:i withObjectAtIndex:n];
}

return newMutableArray;

}

要么你打乱所有对象，要么你只有一个问题的 NSMutableArray，使用 Tag 属性你可以找到属于问题的答案。希望这会有所帮助。