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How do you dismiss the keyboard when editing a UITextField

I know that I need to tell my UITextField to resign first responder when I want to dismis the keyboard, but I'm not sure how to know when the user has pressed the "Done" key on the keyboard. Is there a notification I can watch for? ...
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iphone Core Data Unresolved error while saving

...a when trying to save but the problem that the error is not reproducible ( it appears at different times when doing different tasks) ...
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Permanently add a directory to PYTHONPATH?

... whatever shell you're using (.profile or whatever, depending on your favorite shell) with a command which, again, depends on the shell in question; in Windows, you can do it through the system GUI for the purpose. superuser.com may be a better place to ask further, i.e. for more details if you nee...
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Update Row if it Exists Else Insert Logic with Entity Framework

...one have suggestions on the most efficient way to implement "update row if it exists else insert" logic using Entity Framework? ...
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REST authentication and exposing the API key

I've been reading up on REST and there are a lot of questions on SO about it, as well as on a lot of other sites and blogs. Though I've never seen this specific question asked...for some reason, I can't wrap my mind around this concept... ...
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Do you put unit tests in same project or another project?

Do you put unit tests in the same project for convenience or do you put them in a separate assembly? 15 Answers ...
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What's the difference between a proxy server and a reverse proxy server? [closed]

...r acting on the behalf of another computer. For the purposes of accessibility, I will limit my discussion to web proxies - however, the idea of a proxy is not limited to websites. FORWARD proxy Most discussion of web proxies refers to the type of proxy known as a "forward proxy." The proxy event...
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How do I define a method which takes a lambda as a parameter in Java 8?

...hods can be created as Lambda expressions and can be passed by reference (with a little work under the hood). There are plenty of examples online with lambdas being created and used with methods, but no examples of how to make a method taking a lambda as a parameter. What is the syntax for that? ...
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Checkout old commit and make it a new commit [duplicate]

On Git, say I mess up my commits, and I want to make the version 3 commits ago as the new version. If I do git checkout xxxx , it creates a new branch and it seems like I can only merge it? Could I make this the new "master version"? ...
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Injecting a mock into an AngularJS service

I have an AngularJS service written and I would like to unit test it. 7 Answers 7 ...