NSArray数组随机排序
NSArray和NSMutableArray的区别是前者是不可变数组，一旦数组初始化完成以后，就只能对数组进行查询操作，而后者是可变数组，数组初始化完成以后，继而可以进行增、删、改、查操作。所以对于数组的乱序排序，必须要在可变数组中进行操作。具体代码如下：
//数组随机排序
- (NSMutableArray *) randomizedArrayWithArray:(NSArray *)array {
NSMutableArray *results = [[NSMutableArrayalloc]initWithArray:array];
int i = [results count];
while(--i > 0) {
int j = rand() % (i+1);
[results exchangeObjectAtIndex:i withObjectAtIndex:j];
}
return [results autorelease];
}
//数组随机排序
NSArray *array = @[@"1",@"2",@"3",@"4",@"5"];
NSMutableArray *nutableArray = [[NSMutableArray alloc]initWithArray:array];
int i = (int)[nutableArray count];
while(--i > 0) {
int j = rand() % (i+1);
[nutableArray exchangeObjectAtIndex:i withObjectAtIndex:j];
}
NSLog(@"nutableArray :%@",nutableArray);