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How do I draw a shadow under a UIView?

I'm trying to draw a shadow under the bottom edge of a UIView in Cocoa Touch. I understand that I should use CGContextSetShadow() to draw the shadow, but the Quartz 2D programming guide is a little vague: ...
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Retrieve a Fragment from a ViewPager

I'm using a ViewPager together with a FragmentStatePagerAdapter to host three different fragments: 23 Answers ...
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Access-Control-Allow-Origin Multiple Origin Domains?

Is there a way to allow multiple cross-domains using the Access-Control-Allow-Origin header? 31 Answers ...
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Most efficient way to store thousand telephone numbers

... Here's an improvement to aix's answer. Consider using three "layers" for the data structure: the first is a constant for the first five digits (17 bits); so from here on, each phone number has only the remaining five digits left. We view these rem...
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Why do people say there is modulo bias when using a random number generator?

... have seen this question asked a lot but never seen a true concrete answer to it. So I am going to post one here which will hopefully help people understand why exactly there is "modulo bias" when using a random number generator, like rand() in C++. ...
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How to make an HTML back link?

What is the simplest way to create an <a> tag that links to the previous web page? Basically a simulated back button, but an actual hyperlink. Client-side technologies only, please. ...
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'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine

I'm trying to get data from an Excel file on a button click event. My connection string is: 34 Answers ...
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How to diff one file to an arbitrary version in Git?

How can I diff a file, say pom.xml , from the master branch to an arbitrary older version in Git? 13 Answers ...
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Efficient string concatenation in C++

I heard a few people expressing worries about "+" operator in std::string and various workarounds to speed up concatenation. Are any of these really necessary? If so, what is the best way to concatenate strings in C++? ...
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Disable Interpolation when Scaling a

NOTE : This has to do with how existing canvas elements are rendered when scaled up , not to do with how lines or graphics are rendered onto a canvas surface . In other words, this has everything to do with interpolation of scaled elements , and nothing to do with antialiasing of graphics b...