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What do the plus and minus signs mean in Objective-C next to a method?
In Objective-C, I would like to know what the + and - signs next to a method definition mean.
4 Answers
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How do you execute an arbitrary native command from a string?
I can express my need with the following scenario: Write a function that accepts a string to be run as a native command.
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Will HTML5 allow web apps to make peer-to-peer HTTP connections?
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UPDATE 10/17/2012: This functionality now exists in Chrome Stable v22. In order to use this functionality in Chrome, one must enable two flags in chrome://flags:
Enable MediaStream
Enable PeerConnection
Then you can visit the AppRTC Demo Page to try out the demo. ...
Difference between numpy.array shape (R, 1) and (R,)
...tions return in shape (R, 1) but some return (R,) . This will make matrix multiplication more tedious since explicit reshape is required. For example, given a matrix M , if we want to do numpy.dot(M[:,0], numpy.ones((1, R))) where R is the number of rows (of course, the same issue also occ...
What is the best way to ensure only one instance of a Bash script is running? [duplicate]
...only one instance of a given script is running - assuming it's Bash on Linux?
14 Answers
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How do I add a library project to Android Studio?
...ous answer) some things has changed.
My description is focused on adding external library project by hand via Gradle files (for better understanding the process). If you want to add a library via Android Studio creator just check the answer below with visual guide (there are some differences betwee...
How do I write a custom init for a UIView subclass in Swift?
...uires an implementation of the required init?(coder:), I have updated the example below and changed the let variable declarations to var and optional. In this case, you would initialize them in awakeFromNib() or at some later time.
class TestView : UIView {
var s: String?
var i: Int?
in...
How to 'bulk update' with Django?
...t be on an original QuerySet so you'll need to lean on the .filter() and .exclude() methods.
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How Do I Fetch All Old Items on an RSS Feed?
I've been experimenting with writing my own RSS reader. I can handle the "parse XML" bit. The thing I'm getting stuck on is "How do I fetch older posts?"
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How to make a element expand or contract to its parent container?
The goal is to have the <svg> element expand to the size of its parent container, in this case a <div> , no matter how big or small that container may be.
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