Jeroen Wesbeek 4np

iOS Performance

A list of methods and functions to use when optimizing your iOS application for performance.

snapshotViewAfterScreenUpdates: (returns a snapshot view based on the contents of the current view)
NSProcessInfo.thermalState (check whether the device is already working hard)
UIDevice.batteryState (check whether the battery is full, charging or unplugged)
UIDevice.batteryLevel (determine the charge level of the battery)
NSProcessInfo.isLowPowerModeEnabled (check whether or not the user is trying to spare the battery)
[UIAccessibilityIsReduceMot

Use Xcode 8 with iOS 11

Copy or symlink the iPhoneOS.Platform's DeviceSupport into Xcode 8 (guide):

sudo ln -s /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/11.0\ \(15A5278f\) /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/11.0

Make sure you use the right xcode tools:

Create Mac OS Sierra Install Media

After formatting an USB drive and naming it SierraBootInstall, execute the following line:

sudo /Applications/Install\ macOS\ 10.13\ beta.app/Contents/Resources/createinstallmedia --volume /Volumes/SierraBootInstall --applicationpath /Applications/Install\ macOS\ 10.13\ beta.app --nointeraction &&say Done

How to quickly create a menu bar application

Add a status bar icon

Download this icon and drag it into your Assets.xcassets.

Add a status item

AppDelegate.swift

A list of Swifty Frameworks

Below you will find a list of interesting (primarily) Swift frameworks. This not at all a complete list, merely a list of frameworks I like and am thinking of using.

Alamofire

An HTTP networking library written in Swift. Also see the Networking library mentioned below.

pod 'Alamofire', '~&gt; 4.0'

	import Foundation

	extension UIView {
	class func fromNib<T : UIView>() -> T {
	//swiftlint:disable:next force_unwrapping
	return Bundle.main.loadNibNamed(String(describing: T.self), owner: nil, options: nil)![0] as! T
	}
	}

	//: Playground - noun: a place where people can play

	import UIKit

	//[{
	// "508d49e5d7200200b96d45a3ce6103c4":[{ // filter widget id
	// "table":"incident",
	// "filter":"categoryINsoftware"
	// }],
	// "id":”508d49e5d7200200b96d45a3ce6103c4” // filter widget id

	private func getActiveDisplays() -> [CGDirectDisplayID] {
	var displayCount: UInt32 = 0

	// get the number of active displays
	guard CGGetActiveDisplayList(0, nil, &displayCount) == .success else {
	return []
	}

	// get the active displays
	let allocated = Int(displayCount)

	func getLux() {
	guard let serviceType = IOServiceMatching("AppleLMUController") else {
	debugPrint("No ambient light sensor")
	return
	}

	// get and release service
	let service = IOServiceGetMatchingService(kIOMasterPortDefault, serviceType)
	defer {
	IOObjectRelease(service)

	# 100 connections, 10 second duration, 4 threads
	wrk -c 100 -d 10 -t 4 http://localhost:8080