Dmitry Petukhov dphov

iOS Cell Registration & Reusing with Swift Protocol Extensions and Generics

A common task when developing iOS apps is to register custom cell subclasses for both UITableView and UICollectionView. Well, that is if you don’t use Storyboards, of course.

Both UITableView and UICollectionView offer a similar API to register custom cell classes:

public func registerClass(cellClass: AnyClass?, forCellWithReuseIdentifier identifier: String)
public func registerNib(nib: UINib?, forCellWithReuseIdentifier identifier: String)

@IBDesignable & @IBInspectable

★ UIView

import UIKit

@IBDesignable class DesignableView: UIView {

ffmpeg

Converting Audio into Different Formats / Sample Rates

Minimal example: transcode from MP3 to WMA:
ffmpeg -i input.mp3 output.wma

You can get the list of supported formats with:
ffmpeg -formats

You can get the list of installed codecs with:

emacs --daemon to run in the background. emacsclient.emacs24 <filename/dirname> to open in terminal

NOTE: "M-m and SPC can be used interchangeably".

Undo - C-/
Redo - C-?
Change case: 1. Camel Case : M-c 2. Upper Case : M-u

Lower Case : M-l

(wherever it says url.com, use your server's domain or IP)

Login to new server as root, then add a deploy user

sudo useradd --create-home -s /bin/bash deploy
sudo adduser deploy sudo
sudo passwd deploy

And Update the new password

	extension String {
	func isValidEmail() -> Bool {
	guard !self.lowercaseString.hasPrefix("mailto:") else { return false }
	guard let emailDetector = try? NSDataDetector(types: NSTextCheckingType.Link.rawValue) else { return false }
	let matches = emailDetector.matchesInString(self, options: NSMatchingOptions.Anchored, range: NSRange(location: 0, length: self.characters.count))
	guard matches.count == 1 else { return false }
	return matches[0].URL?.scheme == "mailto"
	}
	}

	extension UIImage {

	func fixedOrientation() -> UIImage {

	if imageOrientation == UIImageOrientation.Up {
	return self
	}

	var transform: CGAffineTransform = CGAffineTransformIdentity

	$ brew update && brew doctor # Repeat, until you've done all the Dr. has ordered!
	$ brew install postgresql # You'll need postgres to do this... you may also need to 'initdb' as well. Google it.

	$ brew install elixir
	$ mix local.hex # Answer y to any Qs
	$ createuser -d postgres # create the default 'postgres' user that Chris McCord seems to like -- I don't create mine w/a pw...

	# Use the latest Phoenix from here: http://www.phoenixframework.org/docs/installation -- currently this is 1.0.3
	# Answer y to any Qs
	$ mix archive.install https://github.com/phoenixframework/phoenix/releases/download/v1.0.3/phoenix_new-1.0.3.ez

	Running shell scripts that have contain sudo commands in them from jenkins might not run as expected. To fix this, follow along
	Simple steps:
	1. On ubuntu based systems, run " $ sudo visudo "
	2. this will open /etc/sudoers file.
	3. If your jenkins user is already in that file, then modify to look like this:

	jenkins ALL=(ALL) NOPASSWD: ALL
	4. save the file by doing Ctrl+O (dont save in tmp file. save in /etc/sudoers, confirm overwrite)
	5. Exit by doing Ctrl+X
	6. Relaunch your jenkins job

	# Steps to build and install tmux from source.
	# Takes < 25 seconds on EC2 env [even on a low-end config instance].

	VERSION=2.7
	sudo yum -y remove tmux
	sudo yum -y install wget tar libevent-devel ncurses-devel
	wget https://github.com/tmux/tmux/releases/download/${VERSION}/tmux-${VERSION}.tar.gz
	tar xzf tmux-${VERSION}.tar.gz
	rm -f tmux-${VERSION}.tar.gz
	cd tmux-${VERSION}