Is there a way to programmatically give focus to another running application in OSX?

I have a use case where I'd like my app to give f开发者_Python百科ocus to a specific running application. How do I do that?

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Just send a chunk of AppleScript from your app, e.g.

tell application "Some other app"
    activate
end tell

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If you know the application's bundle id (and only need to target 10.6+), you can do:

NSRunningApplicatin *app = [NSRunningApplication runningApplicationWithBundleIdentifier:@"com.foo.someapp"];
[app activateWithOptions:NSApplicationActivateAllWindows];

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If the other app has registered a custom URL scheme, you can launch it by submitted a URL with that scheme.