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setNeedsLayout vs. setNeedsUpdateConstraints and layoutIfNeeded vs updateConstraintsIfNeeded
... would change constraints in your overridden updateConstraints method (a recommended way to change constraints, btw), call setNeedsUpdateConstraints, and most of the time, setNeedsLayout after that.
If you need any of the actions above to have immediate effect—e.g. when your need to learn new fram...
docker mounting volumes on host
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The VOLUME command will mount a directory inside your container and store any files created or edited inside that directory on your hosts disk outside the container file structure, bypassing the union file system.
The idea is that your...
Bootstrap carousel multiple frames at once
...imple jQuery plugin that seems to do exactly what you want http://sorgalla.com/jcarousel/
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How to subtract a day from a date?
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if you don't ignore timezones then the answer is more complex.
– jfs
Aug 21 '14 at 13:39
Also, ho...
How to make overlay control above all other controls?
...top a higher ZIndex.
From MSDN:
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" WindowTitle="ZIndex Sample">
<Canvas>
<Rectangle Canvas.ZIndex="3" Width="100" Height="100" Canvas.Top="100" Canvas.Left="100" Fill="blue"/>
<Rectangle Canvas.ZInd...
Why would a post-build step (xcopy) occasionally exit with code 2 in a TeamCity build?
...rror will appear as "exited with code 2". When you run the same xcopy at a command prompt, you'll see that xcopy is asking for a response of file or directory.
To resolve this issue with an automated build, you can echo in a pre-defined response with a pipe.
To say the thing you are copying is a f...
How Python web frameworks, WSGI and CGI fit together
...ur long-running Django process, then you configure Apache's mod_fastcgi to communicate with this process.
Note that mod_wsgi can work in either mode: embedded or daemon.
When you read up on mod_fastcgi, you'll see that Django uses flup to create a WSGI-compatible interface from the information pr...
Operator overloading : member function vs. non-member function?
...meter passed automatically is the this pointer. So no standard exists to compare them. On the other hand, overloaded operator declared as a friend is symmetric because we pass two arguments of the same type and hence, they can be compared.
...
Tainted canvases may not be exported
...ost your images to a site that supports cross-domain sharing (like dropbox.com). Be sure you put your images in dropbox's public folder and also set the cross origin flag when downloading the image (var img=new Image(); img.crossOrigin="anonymous" ...)
Install a webserver on your development comput...
When should use Readonly and Get only properties
...);
double a;
a = f.Fuel; // Will work
f.Fuel = a; // Does not compile
f.FillFuelTank(10); // Value is changed from the method's code
}
Setting the private field of your class as readonly allows you to set the field value only once (using an inline assignment or in the class const...