ManWithBear

libdispatch efficiency tips

The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library. Many references are available at the end of this document pointing to comments from Apple's very own libdispatch maintainer (Pierre Habouzit).

My take-aways are:

• You should create very few, long-lived, well-defined queues. These queues should be seen as execution contexts in your program (gui, background work, ...) that benefit from executing in parallel. An important thing to note is that if these queues are all active at once, you will get as many threads running. In most apps, you probably do not need to create more than 3 or 4 queues.

• Go serial first, and as you find performance bottle necks, measure why, and if concurrency helps, apply with care, always validating under system pressure. Reuse

ManWithBear

    ACTION = build
    AD_HOC_CODE_SIGNING_ALLOWED = NO
    ALTERNATE_GROUP = staff
    ALTERNATE_MODE = u+w,go-w,a+rX
    ALTERNATE_OWNER = grantdavis
    ALWAYS_SEARCH_USER_PATHS = NO
    ALWAYS_USE_SEPARATE_HEADERMAPS = YES
    APPLE_INTERNAL_DEVELOPER_DIR = /AppleInternal/Developer
    APPLE_INTERNAL_DIR = /AppleInternal
    APPLE_INTERNAL_DOCUMENTATION_DIR = /AppleInternal/Documentation

ManWithBear

#!/bin/bash

# Script configuration

devicesArray=(
	"iPhone 8"
	"iPhone 8 Plus"
	"iPhone 5s"
	"iPhone X")

ManWithBear

@objc protocol Refreshable
{
	/// The refresh control
	var refreshControl: UIRefreshControl? { get set }
	
	/// The table view
	var tableView: UITableView! { get set }
	
	/// the function to call when the user pulls down to refresh
	@objc func handleRefresh(_ sender: Any);

ManWithBear

osascript -e 'tell application "iOS Simulator" to quit'
osascript -e 'tell application "Simulator" to quit'
xcrun simctl erase all

ManWithBear

#!/bin/bash
#
# Credits to fuckbecauseican5 from https://www.reddit.com/r/hackintosh/comments/4s561a/macos_sierra_16a238m_install_success_and_guide/
# Adapted to work with the official image available into Mac App Store
#
# Enjoy!

hdiutil attach /Applications/Install\ macOS\ Sierra.app/Contents/SharedSupport/InstallESD.dmg -noverify -nobrowse -mountpoint /Volumes/install_app
hdiutil create -o /tmp/Sierra.cdr -size 7316m -layout SPUD -fs HFS+J
hdiutil attach /tmp/Sierra.cdr.dmg -noverify -nobrowse -mountpoint /Volumes/install_build

ManWithBear

extension String {
  func toEnum<Enum: RawRepresentable where Enum.RawValue == String>() -> Enum? {
    return Enum(rawValue: self)
  }
}

enum Segue: String {
  case Foo
  case Bar
}