iOS开发的字符串排序和计算格林时间代码实例

ios字符串排序和计算格林时间代码实例

//字符串排序

- (nsstring*)signkey:(nsstring *)params

{

    nsmutablestring *parammustr = [nsmutablestring string];

    

    

   

        nsmutablearray *paramsmuarr = [[nsmutablearray alloc] init];

        for (int i = 0; i<params.length; i++)

        {

            unichar c = [params characteratindex:i];

            nsstring * cstr = [nsstring stringwithcharacters:&c length:1];

            [paramsmuarr addobject:cstr];

        }

        

        nsarray *paramsarr = [paramsmuarr sortedarrayusingselector:@selector(compare:)];

        

        for (int j = 0; j<[paramsarr count]; j++)

        {

            [parammustr appendstring:paramsarr[j]];

        }

        

    

    

    return  parammustr;

}



//计算格林时间

    nsdate* dat = [nsdate datewithtimeintervalsincenow:0];

    nstimeinterval a=[dat timeintervalsince1970] * 1000;

    nsstring *timestt = [nsstring stringwithformat:@"%.0f", a];