Mobile App Dev 2021W: Tutorial 2 - Revision history

Soma at 16:38, 1 February 2021

2021-02-01T16:38:00Z

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	}		}
	</syntaxhighlight>		</syntaxhighlight>

			==Solutions==

			[https://homeostasis.scs.carleton.ca/~soma/mad-2021w/solutions/tut2-solutions.txt Tutorial 2 solutions]

Soma: /* Common Problems */

2021-01-28T23:25:18Z

Common Problems

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	==Common Problems==		==Common Problems==

	* If you get an error saying "No account for team" and/or "No signing certificate" ~~when building Convert2Cmd~~ (and you created a signing certificate in Tutorial 1), you may need to change the ~~MacOS~~ deployment version. You can do this by selecting the ~~"Convert2Cmd"~~ at the top of the file view on the left and then changing the deployment target under Info.		* If you get an error saying "No account for team" and/or "No signing certificate" (and you created a signing certificate in Tutorial 1), you may need to change the deployment team or the deployment version (if you aren't running Big Sur and are building a command line program). You can do this by selecting the program at the top of the file view on the left (i.e., Convert2Cmd, Converter2) and then changing the deployment target under Info or the team under Signing and Capabilities.
	* If you cannot see a SwiftUI preview when editing ContentView.swift, you may need to validate project settings and update to recommended settings. You get here by selecting the warning icon near the top right of the Xcode window.		* If you cannot see a SwiftUI preview when editing ContentView.swift, you may need to validate project settings and update to recommended settings. You get here by selecting the warning icon near the top right of the Xcode window.

Soma at 22:47, 28 January 2021

2021-01-28T22:47:15Z

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	You can supplement these with other web resources. In particular, the WWDC videos related to SwiftUI are good, such as [https://developer.apple.com/videos/play/wwdc2020/10119/ this 2020 introduction to SwiftUI]. There are also videos from WWDC 2019 and before, such as this video on [https://developer.apple.com/videos/play/wwdc2019/216/ SwiftUI Essentials]. While you do not need to consult outside material to do the assignments in this class, another perspective can be helpful.		You can supplement these with other web resources. In particular, the WWDC videos related to SwiftUI are good, such as [https://developer.apple.com/videos/play/wwdc2020/10119/ this 2020 introduction to SwiftUI]. There are also videos from WWDC 2019 and before, such as this video on [https://developer.apple.com/videos/play/wwdc2019/216/ SwiftUI Essentials]. While you do not need to consult outside material to do the assignments in this class, another perspective can be helpful.

			==Common Problems==

			* If you get an error saying "No account for team" and/or "No signing certificate" when building Convert2Cmd (and you created a signing certificate in Tutorial 1), you may need to change the MacOS deployment version. You can do this by selecting the "Convert2Cmd" at the top of the file view on the left and then changing the deployment target under Info.
			* If you cannot see a SwiftUI preview when editing ContentView.swift, you may need to validate project settings and update to recommended settings. You get here by selecting the warning icon near the top right of the Xcode window.

	==Questions==		==Questions==

Soma: /* Part A: Converter.swift */

2021-01-27T00:16:24Z

Part A: Converter.swift

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	===Part A: Converter.swift===		===Part A: Converter.swift===

	# If you changed Conversions:8 to <tt> </tt> (removing the underscore), what else would have to be changed to make this declaration correct? Why?		# If you changed Conversions:8 to <tt>func formatConversion(from: Double) -> String {</tt> (removing the underscore), what else would have to be changed to make this declaration correct? Why?
	# The "inch to cm" conversion is coded differently from the others. What is different about it? How would you change it to be similar to the rest?		# The "inch to cm" conversion is coded differently from the others. What is different about it? How would you change it to be similar to the rest?
	# When is the <tt>init</tt> method of the Converter struct (Conversions:16) called?		# When is the <tt>init</tt> method of the Converter struct (Conversions:16) called?

Soma: /* Part A: Converter.swift */

2021-01-27T00:15:56Z

Part A: Converter.swift

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	===Part A: Converter.swift===		===Part A: Converter.swift===

	# If you changed Conversions:6 to <tt>~~var convert: (from: Double) -> Double?~~</tt> (removing the underscore), what else would have to be changed to make this declaration correct? Why?		# If you changed Conversions:8 to <tt> </tt> (removing the underscore), what else would have to be changed to make this declaration correct? Why?
	# The "inch to cm" conversion is coded differently from the others. What is different about it? How would you change it to be similar to the rest?		# The "inch to cm" conversion is coded differently from the others. What is different about it? How would you change it to be similar to the rest?
	# When is the <tt>init</tt> method of the Converter struct (Conversions:16) called?		# When is the <tt>init</tt> method of the Converter struct (Conversions:16) called?

Soma at 03:36, 25 January 2021

2021-01-25T03:36:15Z

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	In this tutorial you'll be playing with [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/code/Convert2Cmd.zip Convert2Cmd] and [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/code/Converter2.zip Converter2]. Convert2Cmd and Converter2 both make use of the unit converters defined in Converter.swift; Convert2Cmd provides a simple command line, menu-based interface to the converters, while Converter2 uses them in a simple SwiftUI-based iOS application. By studying two interfaces for the same functionality, you can see how SwiftUI-based interfaces compare with command line ones.		In this tutorial you'll be playing with [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/code/Convert2Cmd.zip Convert2Cmd] and [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/code/Converter2.zip Converter2]. Convert2Cmd and Converter2 both make use of the unit converters defined in Converter.swift; Convert2Cmd provides a simple command line, menu-based interface to the converters, while Converter2 uses them in a simple SwiftUI-based iOS application. By studying two interfaces for the same functionality, you can see how SwiftUI-based interfaces compare with command line ones.

	Submit your answers by 11:59 PM on Sunday, January 31, 2021 via cuLearn. Please submit a text file following [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/templates/tut2-template.txt this template]. '''Note that you only need to cite sources that weren't covered in lecture and aren't listed below.'''		Submit your answers by 11:59 PM on Sunday, January 31, 2021 via cuLearn. Please submit a text file following [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/templates/tut2-template.txt this template]. ''Note that you only need to cite sources that weren't covered in lecture and aren't listed below.''

	==Key Concepts==		==Key Concepts==

Soma at 03:34, 25 January 2021

2021-01-25T03:34:00Z

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	'~~''This tutorial is still being developed~~.~~'''~~		In this tutorial you'll be playing with [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/code/Convert2Cmd.zip Convert2Cmd] and [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/code/Converter2.zip Converter2]. Convert2Cmd and Converter2 both make use of the unit converters defined in Converter.swift; Convert2Cmd provides a simple command line, menu-based interface to the converters, while Converter2 uses them in a simple SwiftUI-based iOS application. By studying two interfaces for the same functionality, you can see how SwiftUI-based interfaces compare with command line ones.

	~~In this tutorial you'll be playing with [https~~:~~//homeostasis~~.~~scs.carleton.ca/~soma/mad-2021w/code/Convert2Cmd.zip Convert2Cmd] and~~ [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/~~code~~/~~Converter2~~.~~zip Converter2~~]. ~~Convert2Cmd and Converter2 both make use of the unit converters defined in Converter.swift; Convert2Cmd provides a simple command line, menu-based interface~~ to ~~the converters, while Converter2 uses them~~ in ~~a simple SwiftUI-based iOS application. By studying two interfaces for the same functionality, you can see how SwiftUI-based interfaces compare with command line ones~~.		Submit your answers by 11:59 PM on Sunday, January 31, 2021 via cuLearn. Please submit a text file following [https://homeostasis.scs.carleton.ca/~soma/mad-2021w/templates/tut2-template.txt this template]. '''Note that you only need to cite sources that weren't covered in lecture and aren't listed below.'''

	==Key Concepts==		==Key Concepts==

Soma: /* Part A: Converter.swift */

2021-01-24T22:50:00Z

Part A: Converter.swift

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	# When is the <tt>init</tt> method of the Converter struct (Conversions:16) called?		# When is the <tt>init</tt> method of the Converter struct (Conversions:16) called?
	# Is the type declaration in Conversions:28 (the declaration of the conversions dictionary) necessary? Why?		# Is the type declaration in Conversions:28 (the declaration of the conversions dictionary) necessary? Why?
			# Add a conversion for miles to kilometers.

	===Part B: main.swift (Convert2Cmd)===		===Part B: main.swift (Convert2Cmd)===

Soma: /* Part C: ContentView.swift (Converter2) */

2021-01-24T22:49:05Z

Part C: ContentView.swift (Converter2)

← Older revision		Revision as of 22:49, 24 January 2021
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	===Part C: ContentView.swift (Converter2)===		===Part C: ContentView.swift (Converter2)===

			# Can you combine all of the separate views into one view, getting rid of ConvMenu and ConvOutput? Show your attempt and say what happens.
			# Why is there an ! on ContentView:43? How could you get rid of it?
			# Add a menu to the bottom of the screen, identical to the one at the top. How hard was this to do?
			# How could you have values from previous conversions used for new conversions? For example, if you entered in 32 for Fahrenheit, how could you keep that 32 when you switched to inches?
			# Could the ForEach() on ContentView:27 have been used in main? Explain.

	==Code==		==Code==

Soma: /* Part B: main.swift (Convert2Cmd) */

2021-01-24T22:42:10Z

Part B: main.swift (Convert2Cmd)

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	# What type is <tt>convAvail</tt>?		# What type is <tt>convAvail</tt>?
	# What is the i+1 for on main:8?		# What is the i+1 for on main:8?
	# How could I ~~change~~		# How could you change the conversion message to be of the form "Boss, I think 0 Celsius is 32 Farenheit!" with only making changes to main.swift, not Conversions.swift?
			# Why is the test on main:25 needed? Why main:26?

	===Part C: ContentView.swift (Converter2)===		===Part C: ContentView.swift (Converter2)===