I have the following lines of code where I have several vertical stacks of horizontal stacks of buttons on top of a push button titled 'Click me.'
import SwiftUI
struct ContentView: View {
		@State private var eventPresented = false
		@State var fillColors: [Color] = Array(repeating: Color.white, count: 38)
		@State var buttonTitles: [String?] = Array(repeating: nil, count: 38)
		
		var body: some View {
				VStack {
						/* click me */
						VStack() {
								Button("Click me", action: {
										buttonTitles.removeAll()
										for i in 0..<38 {
												buttonTitles.append(String(i + 1))
										}
										fillColors.removeAll()
										for _ in 0..<2 {
												fillColors.append(Color.clear)
										}
										for _ in 0..<36 {
												fillColors.append(Color.white)
										}
								})
						}
						
						/* cal buttons */
						VStack(spacing: 0.0) {
								HStack(spacing: 0.0) {
										ForEach((0...6), id: \.self) {
												Button(buttonTitles[$0] ?? "") {
														eventPresented = true
												}
												.buttonStyle(BorderlessButtonStyle())
												.frame(width: 48, height: 48, alignment: .center)
												.background(RoundedRectangle(cornerRadius: 2)
																				.fill(fillColors[$0])
																				.shadow(color: Color.black.opacity(0.4), radius: 2, x: 0, y: 0)
												)
										}
								}
								...
								...
								...
								HStack(alignment: .top, spacing: 0.0) {
										ForEach((35...36), id: \.self) {
												Button(buttonTitles[$0] ?? "") {
														
												}
												.buttonStyle(BorderlessButtonStyle())
												.frame(width: 48, height: 48, alignment: .center)
												.background(RoundedRectangle(cornerRadius: 2)
																				.fill(fillColors[$0])
																				.shadow(color: Color.black.opacity(0.4), radius: 2, x: 0, y: 0)
												)
										}
								}
								.frame(width: 336.0, height: 48.0, alignment: .leading)
						}
				}
		}
}
If I click on 'Click me,' the application will label each button. My question is how I take the function out of this button. If I do something like the following as I used to doing in Cocoa and UIKit, I get an error. (I've created a function named 'makeButtons.')
import SwiftUI
struct ContentView: View {
		@State private var eventPresented = false
		@State var fillColors: [Color] = Array(repeating: Color.white, count: 38)
		@State var buttonTitles: [String?] = Array(repeating: nil, count: 38)
		
		var body: some View {
				makeButtons()
				
				/* cal buttons */
				VStack(spacing: 0.0) {
						HStack(spacing: 0.0) {
								ForEach((0...6), id: \.self) {
										Button(buttonTitles[$0] ?? "") {
												eventPresented = true
										}
										.buttonStyle(BorderlessButtonStyle())
										.frame(width: 48, height: 48, alignment: .center)
										.background(RoundedRectangle(cornerRadius: 2)
																		.fill(fillColors[$0])
																		.shadow(color: Color.black.opacity(0.4), radius: 2, x: 0, y: 0)
										)
								}
						}
						...
						...
						...
						HStack(alignment: .top, spacing: 0.0) {
								ForEach((35...36), id: \.self) {
										Button(buttonTitles[$0] ?? "") {
												
										}
										.buttonStyle(BorderlessButtonStyle())
										.frame(width: 48, height: 48, alignment: .center)
										.background(RoundedRectangle(cornerRadius: 2)
																		.fill(fillColors[$0])
																		.shadow(color: Color.black.opacity(0.4), radius: 2, x: 0, y: 0)
										)
								}
						}
						.frame(width: 336.0, height: 48.0, alignment: .leading)
				}.frame(minWidth: 370, idealWidth: 370, maxWidth: 370, minHeight: 420, idealHeight: 420, maxHeight: 420, alignment: .top)
		}
		
		func makeButtons() {
				buttonTitles.removeAll()
				for i in 0..<38 {
						buttonTitles.append(String(i + 1))
				}
				fillColors.removeAll()
				for _ in 0..<2 {
						fillColors.append(Color.clear)
				}
				for _ in 0..<36 {
						fillColors.append(Color.white)
				}
		}
}
Thank you.
Tomato
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Let me suppose that I have a horizontal stack of six buttons like the following.
import SwiftUI
struct ContentView: View {
		var body: some View {
				ZStack {
						VStack {
								HStack(spacing: 0.0) {
										Button("1") {
												
										}
										.buttonStyle(BorderlessButtonStyle())
										.frame(width: 48, height: 48, alignment: .center)
										.background(
												RoundedRectangle(cornerRadius: 2)
														.fill(Color.white)
														.shadow(color: Color.black.opacity(0.4), radius: 2, x: 0, y: 0)
										)
										...
										...
										...
										Button("6") {
												
										}
										.buttonStyle(BorderlessButtonStyle())
										.frame(width: 48, height: 48, alignment: .center)
										.background(
												RoundedRectangle(cornerRadius: 2)
														.fill(Color.white)
														.shadow(color: Color.black.opacity(0.4), radius: 2, x: 0, y: 0)
										)
								}
						}
				}.frame(minWidth: 360, idealWidth: 360, maxWidth: 360, minHeight: 240, idealHeight: 240, maxHeight: 240, alignment: .center)
		}
}
In the scenario above, each button is a size of 48 points x 48 points. And I want to add a small number at the top-left corner of each button. ('Small number' means a smaller font size than the button text size.) In Cocoa, it would be like adding (addSubView) an NSTextField object to an NSButton object. In SwiftUI, how can I add a small number to each button? Thank you.
I want to create a drop-down menu with years like the following.
import SwiftUI
struct ContentView: View {
		@State var menuLabel = "2020"
		
		var body: some View {
				MenuButton(menuLabel) {
						Button("2020") {
								menuLabel = "2020"
						}
						Button("2021") {
								menuLabel = "2021"
						}
						Button("2022") {
								menuLabel = "2022"
						}
				}
				.frame(width: 68.0)
				.frame(maxWidth: .infinity, maxHeight: .infinity)
		}
}
But that's tedious. So if I would rather do it with ForEach.
import SwiftUI
struct ContentView: View {
		@State var menuLabel = "2020"
		
		var body: some View {
				MenuButton(menuLabel) {
						ForEach((2020...2030), id: \.self) {
								Button(String($0)) {
										menuLabel = String($0)
								}
						}
				}
				.frame(width: 68.0)
				.frame(maxWidth: .infinity, maxHeight: .infinity)
		}
}
And I will get an error unless I comment out
menuLabel = String($0)
It says
Contextual closure type '() -> Void' expects 0 arguments, but 1 was used in closure body I don't know what it means. So what does it mean, and how can I set the selection to the title of MenuButton, anyway? Thank you.
I have a button (Click me) at the top. And it's followed by some space and stacks of buttons that are horizontally laid out as follows.
import SwiftUI
struct ContentView: View {
		var body: some View {
				ZStack {
						VStack(spacing: 0.0) {
								Button("Click me", action: {
																				
								})
								Spacer()
										.frame(height: 20)
								
								HStack(spacing: 0.0) {
										ForEach((0...6), id: \.self) {
												Button("") {
														
												}
												.tag($0)
												.buttonStyle(BorderlessButtonStyle())
												.frame(width: 48, height: 48, alignment: .center)
												.background(RoundedRectangle(cornerRadius: 2)
																				.fill(Color.white)
																				.shadow(color: Color.black.opacity(0.4), radius: 2, x: 0, y: 0)
												)
										}
								}
								...
								...
								...
								HStack(spacing: 0.0) {
										ForEach((28...34), id: \.self) {
												Button("") {
														
												}
												.tag($0)
												.buttonStyle(BorderlessButtonStyle())
												.frame(width: 48, height: 48, alignment: .center)
												.background(RoundedRectangle(cornerRadius: 2)
																				.fill(Color.white)
																				.shadow(color: Color.black.opacity(0.4), radius: 2, x: 0, y: 0)
												)
										}
								}
								HStack(alignment: .top, spacing: 0.0) {
										ForEach((35...36), id: \.self) {
												Button("") {
														
												}
												.tag($0)
												.buttonStyle(BorderlessButtonStyle())
												.frame(width: 48, height: 48, alignment: .center)
												.background(RoundedRectangle(cornerRadius: 2)
																				.fill(Color.white)
																				.shadow(color: Color.black.opacity(0.4), radius: 2, x: 0, y: 0)
												)
										}
								}
								.frame(width: 336.0, height: 48.0, alignment: .leading)
						}
				}
		}
}
None of the buttons except the very top one has a title as you see above. And I want to set a title to each button and show or hide any of them when necessary. So is it possible for me to access any of the buttons with its tag and set its title and show or hide it? Thank you.
I have a desktop application that allows the user to use it fully without limiations for a week. After one week, it will validate their in-app purchase status. I'll make a simple case. Let me suppose that the application allows them to draw a triangle. After the expiration, they can still draw a triangle. But it won't let them save it as an image to disk after expiration. For the past several months, many of my desktop applications have this free-for-1-week-with-IAP business style. And I never had a problem with reviewers in this regard. This time, I've been hit with the following rejection description.Guideline 4.2 - DesignWe found that your app provides a limited set of features and functionality to users and is therefore not appropriate for the App Store. Specifically, the app requires an in-app purchase after 1 week to continue use.Next StepsWe encourage you to review your app concept and evaluate whether you can incorporate additional features to enhance the user experience.First, I had no idea what the problem this reviewer is saying. I now suppose that he or she has rejected it because the application would be no use after one week. If I'm right, then so what!? I don't really have a problem if every app is treated in the same way. But if this app is rejected because the user will have no use without a purchase after one week, then many of them, if not all, subscription-based apps also have to go? I have asked the reviewer why I need to enterain the user further after one week of free trial. And he or she has ignored my question so far.So what do you think? Thanks.P.S. I see a lot of subscription-based desktop applications at Mac App Store. And I had one desktop application several months ago with a subscription IAP. The reviewer rejected it because it's not a news app and therefore the subscription IAP is not allowed, he or she said.
I have a Cocoa desktop application that allows the user to take desktop screenshots invovling not just the application itself but also other applications. Therefore, it has to use the CGWindowListCreateImage function. Inevitably, the user will be prompted for an alert message with screen recording privacy under macOS 10.15.The reviewer rejects this application because the application shows this alert message under macOS 10.15. I've asked the reviewer what screen recording privacy for, then? And he or she says that it's for producing a video. But there is nothing else other than the CGWindowListCreateImage function, which is inevitably the reason for screen recording privacy. And the same review tells me to use alternatives without naming one. To my knowledge, there is no alternative to CGWindowListCreateImage for taking a desktop screenshot involving other applications. Or is there?
I have an IBOutlet-wired NSView object named displayView, where I add 3 to 4 NSImageView objects as subViews. Whenever the user resizes the application window, this displayView guy needs to be updated. When the user closes the application window with the red close button, the application hides it withNSApp.hide(nil). When the user clicks on the doc icon of the application, the application unhide the window. When it does, the application will remove all sub views likefor sub in displayView.subviews {
sub.removeFromSuperview()
}But the application leaks the memory a big time. If I repeat the sequence of hiding and unhiding the application window 5 to 6 times, its memory consumption can reach 500 MB. I know what to do, but my question is why the application keeps mounting its leak even though it removes its all sub views whenever the application is back to life from hiding itself and updates the displayView guy.Muchos thankos.