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How to tell if UIViewController's view is visible

I have a tab bar application, with <em>mem>any views. Is there a way to know if a particular UIViewController is currently visible fro<em>mem> within the UIViewController ? (looking for a property) ...
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How to check whether a variable is a class or not?

I was wondering how to check whether a variable is a class (not an instance!) or not. 9 Answers ...
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How to load db:seed data into test database auto<em>mem>atically?

I'<em>mem> atte<em>mem>pting to use the new standard way of loading seed data in Rails 2.3.4+, the db:seed rake task. 8 Answers ...
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Getting hold of the outer class object fro<em>mem> the inner class object

I have the following code. I want to get hold of the outer class object using which I created the inner class object inner . How can I do it? ...
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How to check if APK is signed or “debug build”?

As far as I know, in android "release build" is signed APK. How to check it fro<em>mem> code or does Eclipse has so<em>mem>e kinda of secret defines? ...
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How to open a web page fro<em>mem> <em>mem>y application?

I want to <em>mem>ake <em>mem>y WPF application open the default browser and go to a certain web page. How do I do that? 9 Answers ...
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Does a javascript if state<em>mem>ent with <em>mem>ultiple conditions test all of the<em>mem>?

In javascript, when using an if state<em>mem>ent with <em>mem>ultiple conditions to test for, does javascript test the<em>mem> all regardless, or will it bail before testing the<em>mem> all if it's already false? ...
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Co<em>mem>bine two or <em>mem>ore colu<em>mem>ns in a datafra<em>mem>e into a new colu<em>mem>n with a new na<em>mem>e

For exa<em>mem>ple if I have this: 8 Answers 8 ...
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How to <em>mem>ake an ele<em>mem>ent width: 100% <em>mem>inus padding?

I have an ht<em>mem>l input. 14 Answers 14 ...
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Intelligent way of re<em>mem>oving ite<em>mem>s fro<em>mem> a List while enu<em>mem>erating in C#

I have the classic case of trying to re<em>mem>ove an ite<em>mem> fro<em>mem> a collection while enu<em>mem>erating it in a loop: 9 Answers ...