Restart your Cocoa application using Sparkle

本文介绍了一种利用Sparkle框架实现Cocoa应用程序自我重启的方法。相较于传统的命令行辅助程序方案，这种方法更为简便。文章提供了具体的代码示例，演示了如何通过Sparkle框架内的资源来实现应用程序的平滑重启。

原文连接:http://blog.mbcharbonneau.com/2010/06/03/restart-your-cocoa-application-using-sparkle/

It’s not uncommon for an OS X application to need to restart itself in certain unavoidable situations, such as hiding the dock icon. Most of the solutions you’ll find on the Internet rely on a command line helper app that waits for the parent application to finish exiting before launching it again. Although this isn’t hard to implement yourself, chances are you already have everything you need, buried inside the Sparkle framework.

Based on the Sparkle source code, here’s a quick way to restart any application that includes the Sparkle framework.

NSString *launcherSource = [[NSBundle bundleForClass:[SUUpdater class]]  pathForResource:@"relaunch" ofType:@""];
NSString *launcherTarget = [NSTemporaryDirectory() stringByAppendingPathComponent:[launcherSource lastPathComponent]];
NSString *appPath = [[NSBundle mainBundle] bundlePath];
NSString *processID = [NSString stringWithFormat:@"%d", [[NSProcessInfo processInfo] processIdentifier]];

[[NSFileManager defaultManager] removeItemAtPath:launcherTarget error:NULL];
[[NSFileManager defaultManager] copyItemAtPath:launcherSource toPath:launcherTarget error:NULL];
	
[NSTask launchedTaskWithLaunchPath:launcherTarget arguments:[NSArray arrayWithObjects:appPath, processID, nil]];
[NSApp terminate:sender];

If you’re not using Sparkle, here’s a complete implementation of this idea you may find helpful.