自动更新后重新启动我的应用程序?

单独的进程是一个很好的解决方案,看看Sparkle框架(大多数应用程序使用它进行自动更新),它们也用于这个独立的应用程序- https://github.com/andymatuschak/Sparkle/blob/master/relaunch.m

只是扩展一下Julia的答案,因为我不得不重新启动我的应用程序,而不是更新,所以我研究了Sparkle是如何做到的-

Sparkle的最新版本(截至2011年11月)有一个名为finish_installation.app的项目目标,它包含在Sparkle框架的Resources目录中。Sparkle作为主机应用程序的一部分运行,它将finish_应用程序复制到application_支持目录,并使用launched运行其二进制可执行文件,如下图所示,传递主机进程id和重新启动路径:

NSString *relaunchToolPath = [NSString stringWithFormat:@"%@/finish_installation.app/Contents/MacOS/finish_installation", tempDir];
[NSTask launchedTaskWithLaunchPath: relaunchToolPath arguments:[NSArray arrayWithObjects:pathToRelaunch, [NSString stringWithFormat:@"%d", [[NSProcessInfo processInfo] processIdentifier]], tempDir, relaunch ? @"1" : @"0", nil]];
[NSApp terminate:self];

似乎有了这个函数,当父进程退出时(?),将启动finish_应用程序的父级。

finish_installation等待传入的进程id消失,并进行初始检查以查看是否启动了其父进程(pid=1)

if(getppid() == 1)...
if (GetProcessForPID(parentprocessid, &psn) == procNotFound)...

然后启动应用程序:

[[NSWorkspace sharedWorkspace] openFile: appPath];

最后一个有趣的小贴士:如果安装需要很长时间,那么finish_installation会将自身更改为前台进程,以便用户可以看到某些应用正在运行:

ProcessSerialNumber     psn = { 0, kCurrentProcess };
TransformProcessType( &psn, kProcessTransformToForegroundApplication );

Source Blog

- (void) restartOurselves
    {
       //$N = argv[N]
       NSString *killArg1AndOpenArg2Script = @"kill -9 $1 \n open \"$2\"";

       //NSTask needs its arguments to be strings
       NSString *ourPID = [NSString stringWithFormat:@"%d",
                      [[NSProcessInfo processInfo] processIdentifier]];

       //this will be the path to the .app bundle,
       //not the executable inside it; exactly what `open` wants
       NSString * pathToUs = [[NSBundle mainBundle] bundlePath];

       NSArray *shArgs = [NSArray arrayWithObjects:@"-c", // -c tells sh to execute the next argument, passing it the remaining arguments.
                    killArg1AndOpenArg2Script,
                    @"", //$0 path to script (ignored)
                    ourPID, //$1 in restartScript
                    pathToUs, //$2 in the restartScript
                    nil];
       NSTask *restartTask = [NSTask launchedTaskWithLaunchPath:@"/bin/sh" arguments:shArgs];
       [restartTask waitUntilExit]; //wait for killArg1AndOpenArg2Script to finish
       NSLog(@"*** ERROR: %@ should have been terminated, but we are still running", pathToUs);
       assert(!"We should not be running!");
    }