冒泡排序-iOS

NSMutableArray *p = [[NSMutableArray alloc] initWithObjects:@"3",@"5",@"4",@"1",nil];

 - (void)sort:(NSMutableArray *)arr
{
for (int i = 0; i < arr.count; i ++) {
    for (int j = i + 1; j < arr.count; j ++) {
        if ([arr[i] integerValue] > [arr[j] integerValue]) {
            int temp = [arr[i] intValue];
            arr[i] = arr[j];
            arr[j] = [NSNumber numberWithInt:temp];
        }
    }
}
  NSLog(@"选择排序后：%@",arr);
}