function

func averageScore(firstScore: Double, secondScore: Double, thirdScore: Double){
	let totalScore = firstScore + secondScore + thirdScore
	print(totalScore/ 3)
	}

func nameOfFunction(/* parameters */) -> Type {
	var valueToReturn: Type
	return valueToReturn
}

func calculateTip(priceOfMeal: Double) -> Double {
	return priceOfMeal * 0.15
}

func isValidLength(password: String) -> Bool {
	if password.characters.count >= 8 {
		return true
	} else {
		return false
	}
}

func calculateTip(priceOfMeal: Double -> Double{
	return priceOfMeal * 0.15
	})

let priceOfMeal = 43,27

let tip = calculateTip(priceOfMeal: priceOfMeal)

what’s string about

let theTrueth = "Money can't buy me love."
theTruth.characters.count

var forwardString = "spoons"
var charactersReversed = forwardString.characters.reversed()

for character in charactersReversed {
	print ("\(character)")
}

let similarTruth = "can't buy me"

var birthdayCheer = "Happy Birthday!"
print(birthdayCheer)

var name = "Kate"
var customizedBirthdayCheer = "Happy Birthday, \(name)!"
print(customizedBirthdayCheer)

var doggyDiet = "Mia eats 10 lbs of dog food per month."

var dogName = "Zebedee"
var lbsPerMonth: Double = 25

doggyDiet = "\(dogName) eats \(lbsPerMonth)lbs of dog food per month"

print(doggyDiet)

var kilosInALb = 0.45
var metricDoggyDiet = "\(dogName) eats \(kilosInALb * lbsPerMonth)kilos of dog food per month"

print(metricDoggyDiet)

let monkeyString = "I saw a monkey."
let thiefString = "He stole my iPhone."

var monkeyStringWithEmoji = "I saw a *."
var thiefStringWithEmoji = "He stole my *."

var forwardString = "time"
var charactersReversed = forwardString.characters.reversed()

for character in charactersReversed {
	print("\(character)")
}

let numOfPennies = 567
let dollarInt = numofPennies/100
let dollarsAndCentsString = "$\(dollarInt).\(numOfPennies % 100)"

let monkeyString = "I saw a monkey."
let thiefString = "He stole my iPhone."
var sillyMonkeyString = monkeyString + "" + thiefString

replacingOccurences(of: with:)

sillyMonkeyString.contains("key")

Different types of variables

var petsAge = 12
var myMiddleInitial: Character = "A"
var numberOfWheels: Int = 4
var centimetersOfRainfall: Float = 5.5
var pi: Double = 3.14159265359
var letterOfTheDay: Character = "z"
var myFavoriteAnimal: String = "nudibranch"
var rainingOutside: Bool = true

let encouragement = "you can do it!"
var customizedEncouragement = "you can do it, stephanie!"
customizedEncouragement = "you can do it, Ryder!"

let birthYear = 2008
var currentYear = 2017
var age = currentYear - birthYear
currentYear = 2017
age = currentYear - birthYear

Names cannot contain whitespace characters, mathematical symbols, arrows and [a few other obscure characters].
Names must begin with an uppercase or lowercase letter A through Z, an underscore, or [a few other less common options].

let theTrue = "Money can't buy me love."

var characterPoorString = ""
let stringWithPotential = String()

Sandbox

// test code here!
print((200 * 7)/2)

print("hello from iOS team")

var question = "Ready to write your first lines of Swift code?"
print(question)

var response = "Yeah! I'm ready!"
print(response)

var numberOfServingsForRecipe = 4
var desiredNumberOfServings = 8

var servingsFactor = desiredNumberOfServings/numberOfServingsForRecipe

var poundsOfTomatoesForRecipe = 2
var amountToUseToday = poundsOfTomatoesForRecipe * servingsFactor

print(amountToUseToday)

Drawing to code

step1: select the views
step2: position the views
step3: style the views

what view group should you use
-LinearLayout
-RelativeLayout : relative positioning, overlap

The drawable folder
android:src=”@drawable/androidparty”

Position the view
Style the view

Trouble shooting

android studio strouble shooting
https://docs.google.com/document/d/1w1Xn_hnSAODAAtdRDp7haYPBtEwX_l7Htpf8Wpgbu6w/pub?embedded=true

Linear layout

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:tools="http://schemas.android.com/tools"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:paddingBottom="@dimen/activity_vertical_margin"
	android:paddingLeft="@dimen/activity_horizontal_margin"
	android:paddingRight="@dimen/activity_horizontal_margin"
	android:paddingTop="@dimen/activity_vertical_margin"
	tools:context="com.xxx.myapplication.MainActivity">

	<TextView
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:text="Hello world!" />
</RelativeLayout>

Relative Layout

top edge, left edge, right edge, buttom edge
relative to parent

android:layout_alignParentTop=”true”
android:layout_alignParentBottom=”false”
android:layout_alignParentLeft=”true”
android:layout_alignParentRight=”true”

<RelativeLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:padding="16dp">

	<TextView
		android:text="I'm in this corner"
		android:layout_height="wrap_content"
		android:layout_width="wrap_content"
		android:layout_alignParentBottom="true"
		android:layout_alignParentLeft="true" />

    <TextView
        android:text="No, up here"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true" />
 
    <TextView
        android:text="Wait, I’m here"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true" />
 
    <TextView
        android:text="Actually, I’m here"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignParentRight="true" />

</RelativeLayout>

Simple image view

<ImageView
	android:src="@drawable/cake"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:scaleType="center"/>

<ImageView
	android:src="@drawable/cake"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:scaleType="centerCrop"/>

textView android, use google search
https://developer.android.com/reference/android/widget/TextView.html

capitalize

<TextView
	android:text="Oh the possibilites of TextView"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:textSize="36sp"
	android:textAllCaps="false"/>

LinearLayout

<LinearLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content">

<TextView
	android:text="I'm a lonely TextView"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content" />

<TextView
	android:text="I'm a lonely TextView"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content" />

</LinearLayout>

android orientation
https://developer.android.com/reference/android/widget/LinearLayout.html

200dp, wrap_content, match_parent

wrap_content

<TextView
	android:text="wait, today's your birthday?"
	android:background="@android:color/darker_gray"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content" />

font size

<TextView
	android:text="wait, today's your birthday?"
	android:background="@android:color/darker_gray"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:textSize="56sp" />

appearance

<TextView
	android:text="wait, today's your birthday?"
	android:background="@android:color/darker_gray"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:textAppearance="?android:textAppearanceSmall" />

google design spec style color
https://material.io/guidelines/style/color.html

text color and background color

<TextView
	android:text="wait, today's your birthday?"
	android:background="#ECEFF1"
	android:textColor="#616161"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:textAppearance="?android:textAppearanceSmall" />

Using a TextView

<TextView
	android:text="Happy Birthday!"
	android:background="@android:color/darker_gray"
	android:layout_width="150dp"
	android:layout_height="75dp" />

-weird angle brackets
-don’t know what “android:text” means
-says Happy Birthday which appears on phone

XML Syntax

<LinearLayout
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:orientation="vertical">

	<TextView
		android:text="Happy Birthday"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content" />

	<TextView
		android:text="You're the best!"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content" />

</LinearLayout>

Attribute Name, Attribute value in “Quotations”
TextView has default values if you’re ok with default values, don’t set them here.