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在 App Inventor 2 中使用图像 · App Inventor 2 中文网
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在 App Inventor 2 中使用图像，避免一些常见的陷阱！
Out of memory errors
An example of misusing large images
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When to use Storyboard and when to use XIBs
Are there any guidelines on when to use storyboards in an iOS project and when to use XIBs? what are the pros and cons of each and what situations do they each suit?
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App Inventor 2 扩展 · App Inventor 2 中文网
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App Inventor 2 扩展
Initial Release 1.0 (Introduced as part of MIT App Inventor Release nb149)
DRAFT: September 27, 2015
Updated: June 9, 2017
Upda...
Ukkonen's suffix tree algorithm in plain English
I feel a bit thick at this point. I've spent days trying to fully wrap my head around suffix tree construction, but because I don't have a mathematical background, many of the explanations elude me as they start to make excessive use of mathematical symbology. The closest to a good explanation that ...
Add Keypair to existing EC2 instance
I was given AWS Console access to an account with 2 instances running that I cannot shut down (in production). I would however like to gain SSH access to these instances, is it possible to create a new Keypair and apply it to the instances so I can SSH in? Obtaining the exisiting pem file for the ke...
Setting up FTP on Amazon Cloud Server [closed]
I am trying to set up FTP on Amazon Cloud Server, but without luck.
I search over net and there is no concrete steps how to do it.
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How do I pass a unique_ptr argument to a constructor or a function?
I'm new to move semantics in C++11 and I don't know very well how to handle unique_ptr parameters in constructors or functions. Consider this class referencing itself:
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Rails: How does the respond_to block work?
...fused with section 6.7. After generating a scaffold I find the following auto-generated block in my controller:
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What is an optional value in Swift?
...an hold either a value or no value. Optionals are written by appending a ? to any type:
var name: String? = "Bertie"
Optionals (along with Generics) are one of the most difficult Swift concepts to understand. Because of how they are written and used, it's easy to get a wrong idea of what they are. ...
How do you create a read-only user in PostgreSQL?
I'd like to create a user in PostgreSQL that can only do SELECTs from a particular database. In MySQL the command would be:
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