ソフトウェアエンジニアの技術ブログ：Software engineer tech blog

latitude
https://www.esrl.noaa.gov/gmd/grad/solcalc/

Shadows and Trigonometry
18m, 10m, β
β = arctan(18/10) in degrees = 60.9°

w = 25m / tan(1.3°) = 1101m

MC = 40,000Km / 3.68, MC = 10,900K

distance to the moon
10900 = πd
d = 3470km
tan(0.5°)=3470 / L
L = 3470 / tan(0.5) = 398,000 km

distance to the sun
cos α = 400,000/L
L = 400,000/ cos89.853°
L = 156,000,000 km

AVAudioRecorder
Record VC

func audioRecorderDidFinishRecording(_ recorder: AVAudioRecorder, successfully flag: Bool){
	if flag {
		performSegue(withIdentifier: "stopRecording", sender: audioRecorder.url)
	} else {
		print("recording was not successful")
	}
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?){
	if segue.identifier == "stopRecording"{
		let laySoundsVC = segue.destination as! PlaySoundsViewController
		let recordedAudioURL = sender as! url
		playSoundVC.recordedAudioURL = recordedAudioURL
	}
}

Stack Views: Horizontal, Vertical
-alignment, distribution, spacing

AVAudioEngine

var dollars:Int = 10
var cents:Int = 50
var amount = "$\(dollars).\(cents)"
print(amount)

dollars = 19
centsd = 99
amount = "$\(dollars).\(cents)"
print(amout)

func printMoneyString(dollars:Int, cents:Int){
	print("$\(dollars).\(cents)")
}

Document Outline in Xcode

Model View Controller
view(UIView, UILabel, UIButton), controller, model

AutoLayout Basics

@IBOutlet weak var recordButton: UIButton!
@IBOutlet weak var recordingLabel: UILabel!
@IBOutlet weak var resumeButton: UIButton!
@IBOutlet weak var resumeLabel: UILabel!
@IBOutlet weak var pauseButton: UIButton!
@IBOutlet weak var pauseLabel: UILabel!
@IBOutlet weak var stopButton: UIButton!
@IBOutlet weak var stopLabel: UILabel!

@IBOutlet func recordButtonPressed(sender: UIButton){
	// ...
}

ViewController and Multiple Views
Not Running, Inactive, Active, Background, Suspended

Audio in iOS
Pitch Perfect App, AVFoundation, Core Audio, Audio Hardware

import AVFoundation

class ViewController: UIViewController {
	var audioRecorder: AVAudioRecorder!

	@IBAction func recordAudio(_ sender: AnyObject){
		recordingLabel.text = "Recording in progress"
		stopRecordingButton.isEnabled = true
		recordButton.isEnabled = false

		let dirPath = NSSearchPathForDirectoriesInDomains(.documentDirectory,.userDomainMask, true)[0] as String
		let recordingName = "recordedVoice.wav"
		let pathArray = [dirPath, recordingName]
		let filePath = URL(string: pathArray.joined(separator: "/"))

		let session = AVAudioSession.sharedInstance()
		try! session.setCategory(AVAudioSessionCategoryPlayAndRecord, with:AVAudioSessionCategoryOptions.defaultToSpeaker)

		try! audioRecorder = AVAudioRecorder(url: filePath!, settings: [:])
		audioRecorder.isMeteringEnabled = true
		audioRecorder.prepareToRecord()
		audioRecorder.record()
	}
}

import UIKit

var x: Int = 42
var x = 42
let y = 100

var myString = "Hello"

// Control Flow
if x < 50 {
	print("X is less than 50")
} else {
	print("X is greater than or equal to 50")
}

// Classes
class ViewController: UIViewController {
	// Instance Variables go here
	// Class functions go here
}

// Functions
func printHello(){
	print("Hello")
}

printHello()

func printHelloMessage(helloString: String){
	print(helloString)
}

printHelloMessage("Oi!")