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What does addChildViewController actually do?

I'm just dipping my feet for the first time into iOS development, and one of the first things I've had to do is implement a custom container view controller - lets call it SideBarViewController - that swaps out which of several possible child view controllers it shows, almost exactly like a stan...
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Swift: Testing optionals for nil

... For those who are new to swift as I am and are wondering: You still have to unwrap xyz inside the if block. It's safe though, even if you force unwrap – Omar Jun 10 '19 at 1:05 ...
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Transfer-Encoding: gzip vs. Content-Encoding: gzip

...er requests regarding that content (e.g., PUT or conditional GET) to be handled correctly. This is, of course, why performing on-the-fly content-encoding is a stupid idea, and why I added Transfer-Encoding to HTTP as the proper way to do on-the-fly encoding without changing the resource. ...
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Disable git EOL Conversions

...le. Most of the time, it should look like below (or this screen-shot): # Handle line endings automatically for files detected as text # and leave all files detected as binary untouched. * text=auto # Never modify line endings of our bash scripts *.sh -crlf # # The above will handle all files NOT...
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What does .SD stand for in data.table in R

...ks useful but I do not really know what I am doing with it. What does it stand for? Why is there a preceding period (full stop). What is happening when I use it? ...
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How to go back (ctrl+z) in vi/vim

... to Vim] there is a shortcut Ctrl + Z when you have done something nasty and want to return to the previous version of the text. Like BACK button in Word. I wonder how can you achieve this behaviour in Vim. ...
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Resize UIImage by keeping Aspect ratio and width

...image by keeping aspect ratio. These functions uses the fixed points(Width and Height) for RECT while resizing. But in my project, I need to resize the view based on the Width alone, Height should be taken automatically based on the aspect ratio. anyone help me to achieve this. ...
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What does status=canceled for a resource mean in Chrome Developer Tools?

... requests to load things within frames or iframes, but only intermittently and it seemed dependent on the computer and/or the speed of the internet connection. This information is a few months out of date, but I built Chromium from scratch, dug through the source to find all the places where reques...
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How do I revert a Git repository to a previous commit?

...out 0d1d7fc32 Or if you want to make commits while you're there, go ahead and make a new branch while you're at it: git checkout -b old-state 0d1d7fc32 To go back to where you were, just check out the branch you were on again. (If you've made changes, as always when switching branches, you'll have...
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Install go with brew, and running the gotour

... paste the export lines in .bash_profile, not in .bashrc, restart your mac and IntelliJ will find GOPATH (just tested, reboot needed) – firepol Jun 4 '15 at 4:53 ...