iphone - 以随机顺序重新排列 NSArray/NSMutableArray

Question

我使用 NSArray/NSMutable 数组来存储不同的对象。添加所有对象后，我想以随机顺序重新排列它们。我该怎么做？

Answer 1

NSUInteger count = [yourMutableArray 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;
   [yourMutableArray exchangeObjectAtIndex:i withObjectAtIndex:n];
}