如何检查数组中数字的重复? [英] How to check repetition of numbers in an array?

问题描述

我生成随机数并将其存储在数组中

I generate random numbers and store them in an array:

int RandomNumber = arc4random() % 12;
[NSMutablearray *Number addObject:[NSNumber numberWithInt:RandomNumber]];

现在，我要确保不会再次随机创建相同的数字.谁能告诉我如何使用示例代码.

Now I want to make sure the same number is not created randomly again. Can any one please tell me how to do it with sample code.

推荐答案

在生成数字时，可以使用 NSMutableSet 而不是数组.以下代码将创建一个包含10个唯一随机数的数组:

You can use an NSMutableSet instead of an array while generating the numbers. The following code will create an array of 10 unique random numbers:

NSMutableSet *aSet = [NSMutableSet setWithCapacity:10];
while([aSet count]<=10){
    int Randnum = arc4random() % 12;
    [aSet addObject:[NSNumber numberWithInt:Randnum]];
} 
NSArray *arrayOfUniqueRandomNumbers = [aSet allObjects];

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