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An App ID with Identifier '' is not available. Please enter a different string

I am trying to add a new APP ID to prepare for App Store submission and got the following error under the bundle ID I provided. ...
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viewWillDisappear: Determine whether view controller is being popped or is showing a sub-view contro

I'm struggling to find a good solution to this problem. In a view controller's -viewWillDisappear: method, I need to find a way to determine whether it is because a view controller is being pushed onto the navigation controller's stack, or whether it is because the view controller is disappearing ...
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Xcode Simulator: how to remove older unneeded devices?

I'm running Xcode 4.3.1 iOS-Simulator which originally only supports iOS 5.1. 18 Answers ...
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What does %~dp0 mean, and how does it work?

... - expands %I to a file extension only %~sI - expanded path contains short names only %~aI - expands %I to file attributes of file %~tI - expands %I to date/time of file %~zI - expands %I to size of file %~$PATH:I - searches the directories listed in the PATH ...
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What is the difference between a .xib file and a .storyboard?

... Apple introduced the concept of "storyboarding" in iOS5 SDK to simplify and better manage screens in your app. You can still use the .xib way of development. Pre-storyboard, each UIViewController had an associated .xib with it. Storyboard achieves two things: .storyboard ...
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Types in Objective-C on iOS

I want to ask about the fundamental data types in Objective-C on iOS. 3 Answers 3 ...
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Hidden features of Python [closed]

... Chaining comparison operators: >>> x = 5 >>> 1 < x < 10 True >>> 10 < x < 20 False >>> x < 10 < x*10 < 100 True >>> 10 > x <= 9 True >>> 5 == x ...
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What is simplest way to read a file into String? [duplicate]

... Yes, you can do this in one line (though for robust IOException handling you wouldn't want to). String content = new Scanner(new File("filename")).useDelimiter("\\Z").next(); System.out.println(content); This uses a java.util.Scanner, telling it to delimit the input with \Z...
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How do I check OS with a preprocessor directive?

...IN64   64 bit only Unix (Linux, *BSD, Mac OS X) See this related question on some of the pitfalls of using this check. unix __unix __unix__ Mac OS X __APPLE__ __MACH__ Both are defined; checking for either should work. Linux __linux__ linux Obsolete (not POSIX compliant) __linux Obsolete...
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Seeking useful Eclipse Java code templates [closed]

You can create various Java code templates in Eclipse via 46 Answers 46 ...