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How do I show/hide a UIBarButtonItem?

... Save your button in a strong outlet (let's call it myButton) and do this to add/remove it: // Get the reference to the current toolbar buttons NSMutableArray *toolbarButtons = [self.toolbarItems mutableCopy]; // This is how you remove the button from the toolbar and ...
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Cannot create an array of LinkedLists in Java…?

...nto it. ArrayList will index faster, but Fredrik's solution is better overall. – Steve Zobell Mar 9 '17 at 20:08 add a comment  |  ...
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What version of javac built my jar?

...ersion the class has been compiled FOR, not what version compiled it. Java allows you to compile code so that they're compatible with earlier versions of Java. However, this only applies to byte code and format. It will happily compile code that references JDK 6 libraries into a JDK 5 format, for ex...
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How unique is UUID?

...om numbers. However, it seems to me that given enough time, it would eventually repeat it self, just by pure chance. Is there a better system or a pattern of some type to alleviate this issue? ...
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Check that Field Exists with MongoDB

So I'm attempting to find all records who have a field set and isn't null. 4 Answers 4...
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Does the 'mutable' keyword have any purpose other than allowing the variable to be modified by a con

...able of a class with the mutable keyword. As far as I can see it simply allows you to modify a variable in a const method: ...
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Automating “enter” keypresses for bash script generating ssh keys

... is shorter, and should ssh-keygen ever add a question, that will automatically be answered in too. :) – zrajm Apr 24 '15 at 11:08 ...
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AngularJS error: 'argument 'FirstCtrl' is not a function, got undefined'

...nswered Oct 16 '13 at 15:54 gion_13gion_13 38.3k99 gold badges9090 silver badges101101 bronze badges ...
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Scala list concatenation, ::: vs ++

...matic Scala 2.10 has :+ and +: object extractors. – 0__ Jan 18 '13 at 9:25  |  show 6 more comments ...
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Using HTML5/JavaScript to generate and save a file

...me, thanks to Matthew and Dennkster pointing that option out! Here is basically how I do it: 1) get all the content into a string called "content" (e.g. by creating it there initially or by reading innerHTML of the tag of an already built page). 2) Build the data URI: uriContent = "data:applicat...