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iOS 7 parallax effect in my view controller

I'm developing an app for iOS 7 in Objective-C. I've got a screen in my app with a few buttons and a pretty background image. (It's a simple xib with UIButtons on top of a UIImageView .) ...
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iOS White to Transparent Gradient Layer is Gray

I have a CAGradientLayer inserted to the bottom of this small detail view that pops up at the bottom of the app. As you can see, I've set the colors from white to clear, but there's this strange gray tint that is showing up. Any ideas? ...
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Convert UTC datetime string to local datetime

I've never had to convert time to and from UTC. Recently had a request to have my app be timezone aware, and I've been running myself in circles. Lots of information on converting local time to UTC, which I found fairly elementary (maybe I'm doing that wrong as well), but I can not find any informat...
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Distinct not working with LINQ to Objects

...is not that smart when it comes to custom objects. All it does is look at your list and see that it has two different objects (it doesn't care that they have the same values for the member fields). One workaround is to implement the IEquatable interface as shown here. If you modify your Author cl...
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Side-by-side plots with ggplot2

I would like to place two plots side by side using the ggplot2 package , i.e. do the equivalent of par(mfrow=c(1,2)) . 13...
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shared_ptr to an array : should it be used?

Just a small query regarding shared_ptr . 2 Answers 2 ...
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git cherry-pick says “…38c74d is a merge but no -m option was given”

I made some changes in my master branch and want to bring those upstream. when I cherry-pick the following commits however I get stuck on fd9f578 where git says: ...
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Natural Sort Order in C#

Anyone have a good resource or provide a sample of a natural order sort in C# for an FileInfo array? I am implementing the IComparer interface in my sorts. ...
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Circle line-segment collision detection algorithm?

... Taking E is the starting point of the ray, L is the end point of the ray, C is the center of sphere you're testing against r is the radius of that sphere Compute: d = L - E ( Direction vector of ray, from start to end ) f = E - C ( Vector from center sphere...
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iPhone: How to switch tabs with an animation?

I'm switching tabs programmatically in a tab bar driven application using UITabBarController.selectedIndex . The problem I'm trying to solve is how to animate the transition between the views. ie. from the view of the current tab to the view of the selected tab. ...