The following elegant code derived from the new text by Vandad Nahavandipoor on Swift works fine in landscape however since the scrollView is constructed by code one cannot use usual constraints to properly display the chart named CrossTalk.png in landscape. In fact in landscape the chart initially displays in 50% of the screen and when dragged to the right in an attempt to fill the screen the initiating viewController-1 that segued into the current, displaying viewController-2 takes over the entire landscape view. Is there a way to fix this problem in code?
SWIFT latest version 6.1
import UIKit
class ChartViewController: UIViewController, UIScrollViewDelegate,UIGestureRecognizerDelegate {
var imageView: UIImageView?
var scrollView: UIScrollView?
let image = UIImage(named: "CrossTalk.png")
override func viewDidLoad() {
super.viewDidLoad()
imageView = UIImageView(image: image)
scrollView = UIScrollView(frame: view.bounds)
if let theScrollView = scrollView{
theScrollView.addSubview(imageView!)
theScrollView.contentSize = imageView!.bounds.size
view.addSubview(theScrollView)
}
}
Related
I'm working with Cocoa and I create my views in code (no IB) and I'm hitting an issue with NSSplitView.
I have a NSSplitView that I configure in the following way in my view controller, in Swift:
override func viewDidLoad() {
super.viewDidLoad()
let splitView = NSSplitView()
splitView.isVertical = true
splitView.addArrangedSubview(self.createLeftPanel())
splitView.addArrangedSubview(self.createRightPanel())
splitView.adjustSubviews()
self.view.addSubview(splitView)
...
}
The resulting view shows the two subviews and the divider for the NSSplitView, and one view is wider than the other. When I drag the diver to change the width, as soon as I release the mouse, the divider goes back to its original position, as if pulled back by a "spring".
I can't resize the two subviews; the right one always keeps a fixed size. However, nowhere in the code I fix the width of that subview, or any of its content, to a constant.
What I would like to achieve instead is that the right view size is not fixed, and that if I drag the divider at halfway through, the subviews will resize accordingly and end up with the same width.
This is a screen recording of the problem:
Edit: here is how I set the constraints. I'm using Carthography, because otherwise setting constraints in code is extremely verbose beyond the most simple cases.
private func createLeftPanel() -> NSView {
let view = NSView()
let table = self.createTable()
view.addSubview(table)
constrain(view, table) { view, table in // Cartography magic.
table.edges == view.edges // this just constraints table.trailing to
// view.trailing, table.top to view.top, etc.
}
return view
}
private func createRightPanel() -> NSView {
let view = NSView()
let label = NSTextField(labelWithString: "Name of item")
view.addSubview(label)
constrain(view, label) { view, label in
label.edges == view.edges
}
return view
}
There seem to be a bunch of questions on this for old versions of Swift/Xcode, but for some reason it hasn't been working with the latest update. I created a NSVisualEffectView, blurryView, and added the subview to my main view:
class ViewController: NSViewController {
#IBOutlet weak var blurryView: NSVisualEffectView!
override func viewDidLoad() {
super.viewDidLoad()
//background styling
blurryView.wantsLayer = true
blurryView.blendingMode = NSVisualEffectBlendingMode.behindWindow
blurryView.material = NSVisualEffectMaterial.dark
blurryView.state = NSVisualEffectState.active
self.view.addSubview(blurryView, positioned: NSWindowOrderingMode.above, relativeTo: nil)
// Do any additional setup after loading the view.
}
...
}
But when I run it, there is no effect on the window. (when I set it to within window, and layer it on top of my other view, the blur works correctly, but I only want the window to blur.) I also tried doing the same thing in my App Delegate class, but I can't connect my window as an outlet, and therefore can't add the blurry view to the window. Here's what the code would look like:
class AppDelegate: NSObject, NSApplicationDelegate {
func applicationDidFinishLaunching(_ aNotification: Notification) {
// Insert code here to initialize your application
blurryView.wantsLayer = true
blurryView.blendingMode = NSVisualEffectBlendingMode.withinWindow
blurryView.material = NSVisualEffectMaterial.dark
blurryView.state = NSVisualEffectState.active
self.window.contentView?.addSubview(blurryView)
}
...
}
To get an idea if what I'm looking for: NSVisualEffectView Vibrancy
It works quite easy:
In Interface Builder drag a NSVisualEffectView directly as a subview of the main view of your scene.
In the Properties Inspector set Blending Mode to Behind Window
Add the rest of the views you need as subviews of the NSVisualEffectView
That's it, you're done
Here's an example:
Panel 1 View Controller is my blurred view, Background View is the first (non-blurred) view in my "real"view hierarchy.
Swift 5:
Simply add this to your viewWillAppear and it should work:
override func viewWillAppear() {
super.viewWillAppear()
//Adds transparency to the app
view.window?.isOpaque = false
view.window?.alphaValue = 0.98 //you can remove this line but it adds a nice effect to it
let blurView = NSVisualEffectView(frame: view.bounds)
blurView.blendingMode = .behindWindow
blurView.material = .fullScreenUI
blurView.state = .active
view.window?.contentView?.addSubview(blurView)
}
I have a view controller set up in Interface Builder with the following view structure:
- UIView
* UIScrollView
* UIImageView
I want to assign an image to UIImageView so, that the scroll view (and it's content size) will adopt the same width than in the image and automatically calculate the height of the content size according to the image aspect ratio. (This makes the image vertically scrollable inside the UIScrollView.)
I'm using Swift and Interface Builder + SnapKit for managing autolayout constraints.
I managed to make the constraints using SnapKit in the following way:
In Interface Builder, select the view controller and create all missing constraints by selecting Editor / Resolve Auto Layout Issues / Add Missing Constraints
Manually select all generated constraints and select Placeholder / Remove at build time from Attributes Inspector
Assign UIScrollView and UIImageView outlets to the view controller
Assign an image to the UIImageView
Then implement the view controller as follows:
import UIKit
import SnapKit
class ViewController: UIViewController {
#IBOutlet weak var scrollView: UIScrollView!
#IBOutlet weak var imageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
scrollView.snp.makeConstraints { (make) in
make.edges.equalTo(view)
}
let ratio = imageView.image!.size.height / imageView.image!.size.width
imageView.snp.makeConstraints { (make) in
make.top.equalTo(0.0)
make.bottom.equalTo(scrollView.snp.bottom)
make.width.equalTo(view.snp.width)
make.height.equalTo(scrollView.snp.width).multipliedBy(ratio)
}
}
}
I am designing an app which has a screen in which I have a horizontal scroll view which I fill with UIViews dynamically depending upon the number of data I have in my array . I did the same via programmatically. I have mentioned my approach below.
1) I put a Scroll view for scrolling horizontally and created a reference for that in my class.
2) I programatically added views as per my code -
var imagevieww = UIImageView()
#IBOutlet weak var hrzntlscrl: UIView!
#IBOutlet weak var scrollview: UIScrollView!
override func viewDidLoad()
{
super.viewDidLoad()
let viewcount = 15
for var i = 0; i < viewcount; i++
{
let viewnew = UIView(frame: CGRectMake( hrzntlscrl.frame.origin.x+110*CGFloat(i), 0, 100.0, hrzntlscrl.frame.height))
viewnew.backgroundColor = UIColor.orangeColor()
imagevieww = UIImageView(frame: CGRectMake(0, 10, 100.0, 50))
imagevieww.backgroundColor = UIColor.blackColor()
viewnew.addSubview(imagevieww)
scrollview.addSubview(viewnew)
}
}
So I just wanted to know that instead of creating a view and the corresponding subviews eg. here imageview and setting their location and frame size programatically , Can I have a standard custom view designed in my IB and use any reference of that in my for loop instead of creating one programmatically? If we can do that,can you please give me some steps.
Yes. This is possible. You can instantiate a class from a nib with
let customView: CustomView = NSBundle.mainBundle().loadNibNamed("CustomViewNibName", owner: self, options: nil)[safe: 0] as? CustomView
You would also need to set the content size of the horizontal scroll view to the combined width of all the views.
But I think that your use case would be better served by using a UICollectionView instad of a scroll view, UICollectionView does all this and more in a much simpler implementation.
I'm trying to get a very basic NSPageController to work (in book mode, not history mode). It will successfully transition once, and then stop working.
I suspect I'm creating the NSImageViews I'm loading into it wrong, but I can't figure out how.
The storyboard has a the SamplePageController which holds in initial hard-coded NSImageView.
I suspect I'm missing something really obvious here, since all of the tutorial's I've found for NSPageController are in Objective C not swift, and tend to focus on the history view mode.
The code is:
import Cocoa
class SamplePageController: NSPageController, NSPageControllerDelegate {
private var images = [NSImage]()
#IBOutlet weak var Image: NSImageView!
//Gets an object from arranged objects
func pageController(pageController: NSPageController, identifierForObject object: AnyObject) -> String {
let image = object as! NSImage
let image_name = image.name()!
let temp = arrangedObjects.indexOf({$0.name == image_name})
return "\(temp!)"
}
func pageController(pageController: NSPageController, viewControllerForIdentifier identifier: String) -> NSViewController {
let controller = NSViewController()
let imageView = NSImageView(frame: Image.frame)
let intid = Int(identifier)
let intid_u = intid!
imageView.image = images[intid_u]
imageView.sizeToFit()
controller.view = imageView
return controller
// Does this eventually lose the frame since we're returning the new view and then not storing it and the original ImageView is long gone by then?
// Alternatively, are we not sizing the imageView appropriately?
}
override func viewDidLoad() {
super.viewDidLoad()
images.append(NSImage(named:"text")!)
images.append(NSImage(named:"text-2")!)
arrangedObjects = images
delegate = self
}
}
In this case your pageController.view is set to your window.contentView and that triggers the warning. What you need to do is add a subview in the window.contentView and have your pageController.view point to that instead.
The reason for the warning is that since NSPageController creates snapshots (views) of your content history, it will add them at the same level as your pageController.view to transition between them: that means it will try to add them to pageController.view.superview.
And if your pageController.view is set to window.contentView, you are adding subviews to the window.contentView.superview, which is not supported:
New since WWDC seed: NSWindow has never supported clients adding subviews to anything other than the contentView.
Some applications would add subviews to the contentView.superview (also known as the border view of the window). NSWindow will now log when it detects this scenario: "NSWindow warning: adding an unknown subview:".
Applications doing this will need to fix this problem, as it prevents new features on 10.10 from working properly. See titlebarAccessoryViewControllers for official API.