如何按照其中包含的数字对NSStrings数组进行排序？ （按升序排列）

Question

我想知道是否可以根据其中包含的数值对NSStrings的NSArray进行排序。基本上它是进程ID和进程名称的列表，我想根据进程ID对进程进行排序。该数组如下所示：

"286             Google Chrome He",
"1209             ibtool",
"0             kernel_task",
"1             launchd",
"10             kextd",
"11             notifyd",
"12             diskarbitrationd",
"13             configd",
"14             syslogd",
"15             DirectoryService",
"16             distnoted",
"18             ntpd",
"22             SystemStarter",
"25             securityd",
"28             mds",
"29             mDNSResponder",
"30             loginwindow",
"31             KernelEventAgent",
"33             hidd",
"34             fseventsd",
"36             dynamic_pager",
"42             blued",
"43             autofsd",
"46             WDSmartWareD",
"47             WDDMService",
"61             coreservicesd",
"62             WindowServer",
"71             HWPortCfg",
"72             HWNetCfg",
"159             socketfilterfw",
"165             cvmsServ",
"177             coreaudiod",
"191             vmnet-bridge",
"196             vmnet-dhcpd",
"198             vmnet-netifup",
"200             vmnet-dhcpd",
"204             vmnet-natd",
"206             vmnet-netifup",
"220             launchd",
"224             Dock",
"225             SystemUIServer",
"226             Finder",
"228             pboard",
"229             fontd",
"240             UserEventAgent",
"247             AirPort Base Sta",
"252             iprint-listener",
"253             StatusMenu",
"254             Dropbox",
"271             dbfseventsd",
"275             Google Chrome",
"295             Google Chrome He",
"298             AppleSpell",
"634             Google Chrome He",
"696             Google Chrome He",
"730             Microsoft Word",
"733             Microsoft Databa",
"736             Microsoft AU Dae",
"1095             usbmuxd",
"1110             Xcode",
"1171             Interface Builde",
"1282             Interface Builde",
"1283             Interface Builde",
"1475             Google Chrome He",
"1531             Google Chrome He",
"1533             Google Chrome He",
"1681             Google Chrome He",
"1682             Google Chrome He",
"1686             Google Chrome He",
"1687             Google Chrome He",
"1692             Google Chrome He",
"1945             Google Chrome He",
"2088             Keynote",
"2268             Google Chrome He",
"2326             Google Chrome He",
"2481             Google Chrome He",
"2545             Google Chrome He",
"2596             Google Chrome He",
"2766             mdworker",
"2933             Google Chrome He",
"2963             iPhone Simulator",
"2967             SimulatorBridge",
"2970             lsd",
"2971             SpringBoard",
"2982             ocspd",
"2998             installd",
"3000             TableViewControl",
"3001             taskgated",
"3002             gdb-i386-apple-d"

非常感谢任何帮助！

Answer 1

对于您的情况，最简单的方法是使用排序描述符：

NSSortDescriptor *sort = [NSSortDescriptor sortDescriptorWithKey:@"integerValue" ascending:YES];
NSArray *sortedArray = [originalArray sortedArrayUsingDescriptors:[NSArray arrayWithObject:sort]];

Answer 2

是的，您可以使用以下NSArray实例方法：

- (NSArray *)sortedArrayUsingFunction:(NSInteger (*)(id, id, void *))comparator context:(void *)context

您需要定义一个带有三个参数的int函数：两个要比较的数组元素和一个上下文。它返回NSComparisonResult（-1,0或1）。例如：

NSInteger firstWordIntCompare(id stringLeft, id stringRight, void *context)
{
    // Extract number from stringLeft and stringRight
    NSArray *wordsLeft = [stringLeft componentsSeparatedByString:@" "];
    NSArray *wordsRight = [stringRight componentsSeparatedByString:@" "];
    NSString *firstWordLeft = wordsLeft.count ? [wordsLeft objectAtIndex:0] : nil;
    NSString *firstWordRight = wordsRight.count ? [wordsRight objectAtIndex:0] : nil;
    int intLeft = [firstWordLeft intValue];
    int intRight = [firstWordRight intValue];

    if (intLeft < intRight)
        return NSOrderedAscending;
    else if (intLeft > intRight)
        return NSOrderedDescending;
    else 
        return NSOrderedSame;
}

然后通过使用函数调用NSArray方法返回已排序的数组：

NSArray *sortedArray = [origArray sortedArrayUsingFunction:firstWordIntCompare context:NULL];