swift 版

        var numbers = [17, 28, 36, 15, 39]

        print("排序前\(numbers)")

        for i in 0..<numbers.count - 1 {

            for j in 0..<numbers.count - 1 - i {

                if numbers[j] > numbers[j + 1] {

                    numbers.swapAt(j, j+1)

                }

            }

        }

        print("排序后\(numbers)")

OC版

    NSMutableArray *numbers = [NSMutableArray arrayWithObjects:@"17",@"28",@"36",@"15",@"39", nil];

    NSLog(@"排序前%@",numbers);

    for (int i = 0; i < 5 - 1; i++) {

        //比较的躺数

        for (int j = 0; j < 5 - 1 - i; j++) {

            //比较的次数

            if ([numbers[j] intValue] > [numbers[j + 1] intValue]) {

                //这里为升序排序

                int temp = [numbers[j] intValue];

                numbers[j] = numbers[j + 1];

                //OC中的数组只能存储对象，所以这里转换成string对象

                numbers[j + 1] = [NSString stringWithFormat:@"%d",temp];

            }

        }

    }

    NSLog(@"排序后%@",numbers);