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How to tell if UIViewController's view is visible

I have a tab bar application, with many views. Is there a way to know if a particular UIViewController is currently visible from within the UIViewController ? (looking for a property) ...
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Is unsigned integer subtraction defined behavior?

... Thank you! I now see the interpretation I was missing. I think they could have chosen a clearer wording though. – user14554 Aug 28 '11 at 14:25 ...
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How to access full source of old commit in BitBucket?

...g/user/project/commits/0000000000000000000000000000000000000000?at=master. Now, just change commits in the url to src and you are browsing the full source at this commit! – Peter Sep 15 '17 at 14:07 ...
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Is there any way to check if iOS app is in background?

...onDidBecomeActive:(UIApplication *)application { NSLog(@"app is actvie now"); } - (void)applicationWillResignActive:(UIApplication *)application { NSLog(@"app is not actvie now"); } share | ...
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Why are C# interface methods not declared abstract or virtual?

...nce void AliasedMethod() cil managed { .override MyInterface::Method } Now, consider this weird case: interface MyInterface { void Method(); } class Base { public void Method(); } class Derived : Base, MyInterface { } If Base and Derived are declared in the same assembly, the compiler wil...
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How do I create a self-signed certificate for code signing on Windows?

...ndows Server 2012, Windows Server 2012 R2, or Windows 8.1 then MakeCert is now deprecated, and Microsoft recommends using the PowerShell Cmdlet New-SelfSignedCertificate. If you're using an older version such as Windows 7, you'll need to stick with MakeCert or another solution. Some people suggest ...
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When to use lambda, when to use Proc.new?

...ues on the next line return "Jason" end whowouldwin #=> "Jason" Now here's a Proc.new-created proc's return doing the same thing. You're about to see one of those cases where Ruby breaks the much-vaunted Principle of Least Surprise: def whowouldwin2 myproc = Proc.new {return "Freddy"}...
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Create a string of variable length, filled with a repeated character

... new repeat function built into String.prototype handles this now (ES6+) – AlexMA Oct 18 '16 at 18:05 ...
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vbscript output to console

...lly switches to CSCript if required Dim CONS: Set CONS = New cCONSOLE '// Now we can use the Consol object to write to and read from the console With CONS '// Simply write a line .print "CSCRIPT Console demo script" '// Arguments are passed through correctly, if present .Print ...
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Exclude folder from search but not from the project list

... I think this answer is out dated now. Setting > Project Settings > Scopes doesnt seem to exist – Andrew Dec 16 '16 at 13:47 3 ...