Mobile App Dev 2022W: Tutorial 2 - Revision history

Soma: /* Tasks */

2022-01-19T06:11:55Z

Tasks

← Older revision		Revision as of 06:11, 19 January 2022
Line 23:		Line 23:
	# Move the analysis menu to the top of the screen.		# Move the analysis menu to the top of the screen.
	# Add a menu option "Empty" that returns "Yes" or "No" based on whether the input string is empty or not. Define it using a closure/anonymous function.		# Add a menu option "Empty" that returns "Yes" or "No" based on whether the input string is empty or not. Define it using a closure/anonymous function.
	# Add a menu option "Pets Mentioned" that counts how many of the words "Shift", "Tab" or "Roshi" (or any other pets you like) appears in the text. Multiple occurrences of the same pet should only be counted once. Define this using a named function "countPetsMentioned".		# Add a menu option "Pets Mentioned" that counts how many of the words "Shift", "Tab" or "Roshi" (or any other pets you like) appears in the text. Multiple occurrences of the same pet should only be counted once. Define this using a named function "countPetsMentioned". (Hint: try the string "contains" method.)

	==Code==		==Code==

Soma: /* Tasks */

2022-01-19T06:10:47Z

Tasks

← Older revision		Revision as of 06:10, 19 January 2022
Line 23:		Line 23:
	# Move the analysis menu to the top of the screen.		# Move the analysis menu to the top of the screen.
	# Add a menu option "Empty" that returns "Yes" or "No" based on whether the input string is empty or not. Define it using a closure/anonymous function.		# Add a menu option "Empty" that returns "Yes" or "No" based on whether the input string is empty or not. Define it using a closure/anonymous function.
	# Add a menu option "~~Pet Mentions~~" that counts ~~the number of occurrences~~ of the words "Shift", "Tab" or "Roshi", or any other pets you like. Define this using a named function "~~countPets~~".		# Add a menu option "Pets Mentioned" that counts how many of the words "Shift", "Tab" or "Roshi" (or any other pets you like) appears in the text. Multiple occurrences of the same pet should only be counted once. Define this using a named function "countPetsMentioned".

	==Code==		==Code==

Soma: /* Code */

2022-01-19T06:08:55Z

Code

← Older revision		Revision as of 06:08, 19 January 2022
Line 61:		Line 61:
	mode in		mode in
	Button(mode, action: {		Button(mode, action: {
	analysisMode = mode;		analysisMode = mode
	})		})
	}		}
Line 70:		Line 70:

	func countUpper(_ s: String) -> String {		func countUpper(_ s: String) -> String {
	var count = 0;		var count = 0
	let upperCase: Set<Character> =		let upperCase: Set<Character> =
	["A","B","C","D","E","F","G","H","I","J","K","L","M",		["A","B","C","D","E","F","G","H","I","J","K","L","M",
	"N","O","P","Q","R","S","T","U","V","W","X","Y","Z"];		"N","O","P","Q","R","S","T","U","V","W","X","Y","Z"]

	for c in s {		for c in s {
	if (upperCase.contains(c)) {		if (upperCase.contains(c)) {
	count += 1;		count += 1
	}		}
	}		}

Soma at 05:57, 19 January 2022

2022-01-19T05:57:38Z

← Older revision		Revision as of 05:57, 19 January 2022
Line 1:		Line 1:
	~~'''This tutorial is still being developed.'''~~

	In this tutorial we'll be playing with <tt>textanalyzer-1</tt>, a very simple app for analyzing text that shows off a number of features of Swift and SwiftUI.		In this tutorial we'll be playing with <tt>textanalyzer-1</tt>, a very simple app for analyzing text that shows off a number of features of Swift and SwiftUI.

Soma at 05:48, 19 January 2022

2022-01-19T05:48:25Z

← Older revision		Revision as of 05:48, 19 January 2022
Line 6:		Line 6:

	First, create a multiplatform app called "textanalyzer-1". Replace the contents of ContentView.swift with the code below.		First, create a multiplatform app called "textanalyzer-1". Replace the contents of ContentView.swift with the code below.

			==Resources==

			* [https://docs.swift.org/swift-book/LanguageGuide/StringsAndCharacters.html Swift: Strings and Characters]
			* [https://docs.swift.org/swift-book/LanguageGuide/Functions.html Swift: Functions]
			* [https://docs.swift.org/swift-book/LanguageGuide/Closures.html Swift: Closures]
			* [https://developer.apple.com/documentation/swiftui/foreach SwiftUI: ForEach]

	==Questions==		==Questions==

Soma: /* Questions */

2022-01-19T05:45:09Z

Questions

← Older revision		Revision as of 05:45, 19 January 2022
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	# What kind of data structure is analysis? What data does it contain?		# What kind of data structure is analysis? What data does it contain?
	# What is the difference between the ForEach and for-in constructs? Are they interchangeable?		# What is the difference between the ForEach and for-in constructs? Are they interchangeable?
			# How does countUpper figure out whether a character is upper case or not?

			==Tasks==

			# Move the analysis menu to the top of the screen.
			# Add a menu option "Empty" that returns "Yes" or "No" based on whether the input string is empty or not. Define it using a closure/anonymous function.
			# Add a menu option "Pet Mentions" that counts the number of occurrences of the words "Shift", "Tab" or "Roshi", or any other pets you like. Define this using a named function "countPets".

	==Code==		==Code==

Soma: /* Tasks/Questions */

2022-01-19T05:35:25Z

Tasks/Questions

← Older revision		Revision as of 05:35, 19 January 2022
Line 7:		Line 7:
	First, create a multiplatform app called "textanalyzer-1". Replace the contents of ContentView.swift with the code below.		First, create a multiplatform app called "textanalyzer-1". Replace the contents of ContentView.swift with the code below.

	==~~Tasks/~~Questions==		==Questions==

	# This code defines two views. What are they? How are they connected to each other?		# This code defines two views. What are they? How are they connected to each other?

Soma at 05:35, 19 January 2022

2022-01-19T05:35:13Z

← Older revision		Revision as of 05:35, 19 January 2022
Line 1:		Line 1:
			'''This tutorial is still being developed.'''

			In this tutorial we'll be playing with <tt>textanalyzer-1</tt>, a very simple app for analyzing text that shows off a number of features of Swift and SwiftUI.

			==Getting Started==

			First, create a multiplatform app called "textanalyzer-1". Replace the contents of ContentView.swift with the code below.

			==Tasks/Questions==

			# This code defines two views. What are they? How are they connected to each other?
			# What kind of data structure is analysis? What data does it contain?
			# What is the difference between the ForEach and for-in constructs? Are they interchangeable?

	==Code==		==Code==

			[https://homeostasis.scs.carleton.ca/~soma/mad-2022w/code/textanalyzer-1/ContentView.swift ContentView.swift for textanalyzer-1]

	<syntaxhighlight lang="swift" line>		<syntaxhighlight lang="swift" line>

Soma: Created page with "==Code== // // ContentView.swift for textanalyzer-1 // // Created by Anil Somayaji on 2022-01-19. // import SwiftUI struct ContentView..."

2022-01-19T05:28:12Z

Created page with "==Code== <syntaxhighlight lang="swift" line> // // ContentView.swift for textanalyzer-1 // // Created by Anil Somayaji on 2022-01-19. // import SwiftUI struct ContentView..."

New page

==Code==

<syntaxhighlight lang="swift" line>
//
// ContentView.swift for textanalyzer-1
//
// Created by Anil Somayaji on 2022-01-19.
//

import SwiftUI

struct ContentView: View {
@State private var t = ""
@State private var analysisMode = "Count"
var body: some View {
VStack{
Text("Text Analyzer").bold().padding()
TextField("Enter Text", text: $t).padding()
Text(analysisMode + ": " + analysis[analysisMode]!(t)).padding()
ModeMenu(analysisMode: $analysisMode)
}
}
}

struct ModeMenu: View {
@Binding var analysisMode: String

var body: some View {
let availModes = [String](analysis.keys)

Menu("Analysis menu") {
ForEach(availModes, id: \.self) {
mode in
Button(mode, action: {
analysisMode = mode;
})
}
}

}
}

func countUpper(_ s: String) -> String {
var count = 0;
let upperCase: Set<Character> =
["A","B","C","D","E","F","G","H","I","J","K","L","M",
"N","O","P","Q","R","S","T","U","V","W","X","Y","Z"];

for c in s {
if (upperCase.contains(c)) {
count += 1;
}
}

return String(count);
}

let analysis: [String: (String) -> String] = [
"Count": {s in return String(s.count)},
"Upper Case": countUpper
]

struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
</syntaxhighlight>