数组乱序

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最新推荐文章于 2024-02-13 22:43:23 发布

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#pragma mark -
#pragma mark (NSMutableArray *)randArray:(NSMutableArray *)ary
- (NSMutableArray *)randArray:(NSMutableArray *)ary{
	NSMutableArray *tmpAry = [NSMutableArray arrayWithArray:ary];
	NSUInteger count = [ary count];
	for (NSUInteger i = 0; i < count; ++i) {
		int nElements = count - i;
		// Seed the random number generator
		srandom(time(NULL));
		int n = (random() % nElements) + i;
		[tmpAry exchangeObjectAtIndex:i withObjectAtIndex:n];
	}
	return tmpAry;
}