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关于我们 · App Inventor 2 中文网，少儿编程陪伴者
... Q & A 常见问题解答 App Inventor 2 中文网 和 电教馆的网站...
How to rename with prefix/suffix?
...available and you have to rename more than one file, shell scripting can really be short and simple for this. For example, to rename all *.jpg to prefix_*.jpg in the current directory:
for filename in *.jpg; do mv "$filename" "prefix_$filename"; done;
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Duplicate symbols for architecture x86_64 under Xcode
...at defines an Objective-C class or category. While this option will
typically result in a larger executable (due to additional object code
loaded into the application), it will allow the successful creation of
effective Objective-C static libraries that contain categories on
existing classes...
How to find list of possible words from a letter matrix [Boggle Solver]
Lately I have been playing a game on my iPhone called Scramble. Some of you may know this game as Boggle. Essentially, when the game starts you get a matrix of letters like so:
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How to move git repository with all branches from bitbucket to github?
What is the best way to move a git repository with all branches and full history from bitbucket to github? Is there a script or a list of commands I have to use?
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Rotating videos with FFmpeg
...ine).
Note that this will re-encode the audio and video parts. You can usually copy the audio without touching it, by using -c:a copy. To change the video quality, set the bitrate (for example with -b:v 1M) or have a look at the H.264 encoding guide if you want VBR options.
A solution is also to u...
How to remove focus around buttons on click
My buttons all have a highlight around them after I click them. This is in Chrome.
38 Answers
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How do I check if a property exists on a dynamic anonymous type in c#?
.... It's a not-uncommon coding convention. Some folks like an "Is" prefix on all boolean properties. Consistency like that can prevent you from having to guess the first few characters of an identifier (after which, Intellisense works), but at the expense of making a little awkward English in cases li...
Selectors in Objective-C?
First, I'm not sure I really understand what a selector is. From my understanding, it's the name of a method, and you can assign it to a class of type 'SEL' and then run methods such as respondToSelector to see if the receiver implements that method. Can someone offer up a better explanation?
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JavaScript before leaving the page
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Just a note, if you want to conditionally display a message in onbeforeunload, return false will make the browser show "false" in a dialog. You need to return undefined if you want to let the window close with no user alert.
– Dan Fitch
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