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Make the viewController's view a NSVisualEffectsView


Make the viewController's view a NSVisualEffectsView

By : user2953732
Date : November 21 2020, 01:01 AM
To fix this issue 1) You can delete the view in the outline view and then add a visual effects view as the view controller's view.
2) Add a effects view as the subview of the view.
code :


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Does adding many many subviews to a viewcontrollers default view make my app slow?

Does adding many many subviews to a viewcontrollers default view make my app slow?


By : Kapil
Date : March 29 2020, 07:55 AM
around this issue Having deep view hierarchies can lead to slow downs that you can often fix through flattening them some with custom views, but if you are using simple views you can have dozens on the screen with no perceptible performance impact, so in general I recommend ignoring how many views you have when you are developing, and then reducing the view count if it proves to be a performance problem.
Having said that, you appear to be setting up something with an unboundedily large number of views which is not good. Without knowing how many entries there are in array titles I can't tell you what is going on exactly, but I suspect that while the actual visual heiarchy with each backView you are creating is fine, making a backView for each item in the array and using indices to have the front most one hide all the other ones behind it is causing you to have way too many views.
Xcode: How do I move an object from one viewControllers view to another viewControllers view?

Xcode: How do I move an object from one viewControllers view to another viewControllers view?


By : user3507110
Date : March 29 2020, 07:55 AM
will help you There are many ways to pass the object which depend on the situation. The most common ways to do that are either delegates or notifications. An example of delegates: http://iosdevelopertips.com/objective-c/the-basics-of-protocols-and-delegates.html
An example of notifications: http://www.hivestudio.cat/index.php?option=com_content&view=article&id=54:technical-note-communicate-using-nsnotificationcenter&catid=35:technical-note-category&Itemid=76
iOS: Keeping a View constant or passing a view between various ViewControllers

iOS: Keeping a View constant or passing a view between various ViewControllers


By : user3058229
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Ok, so I can't really understand some parts of how and why you want to do what you want to do. From what I understood, you want to hide the 'First' controller and show the 'Second' controller instead, but in doing so, you don't want to release the 'multiswitch' control. I also assume you want to completely throw away 'First' and recreate it if necessary.
To be truthful, I don't really like your solution, but I also don't know a lot about what you are trying to do, so I will just try to give an answer based on the asumptions above.
code :
// Remove 'self' as target. You don't want to receive signals in 'First' anymore, because once it will get released you will end up with a crash.
   [self.multiswitch removeTarget:self action:@selector(changedSegmentedControl:) forControlEvents:UIControlEventValueChanged];
// Remove the segmented control from it's superview. It will be added in the 'Second' controller view hierarchy.
   [self.multiswitch removeFromSuperview];
[self.multiswitch addTarget:self action:@selector(changedSegmentedControl:) forControlEvents:UIControlEventValueChanged];
Why can I not constrain a view created in the viewDidLoad method to the ViewControllers View?

Why can I not constrain a view created in the viewDidLoad method to the ViewControllers View?


By : timrmoor
Date : March 29 2020, 07:55 AM
seems to work fine It seems you forgot to add the webView to view before adding constraints:
code :
view.addSubview(webView)
webView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(webView)

NSLayoutConstraint(item: webView,
                   attribute: .leading,
                   relatedBy: .equal,
                   toItem: view,
                   attribute: .leading,
                   multiplier: 1.0,
                   constant: 0.0).isActive = true

NSLayoutConstraint(item: webView,
                   attribute: .trailing,
                   relatedBy: .equal,
                   toItem: view,
                   attribute: .trailing,
                   multiplier: 1.0,
                   constant: 0.0).isActive = true

NSLayoutConstraint(item: webView,
                   attribute: .top,
                   relatedBy: .equal,
                   toItem: view,
                   attribute: .top,
                   multiplier: 1.0,
                   constant: 0.0).isActive = true

NSLayoutConstraint(item: webView,
                   attribute: .bottom,
                   relatedBy: .equal,
                   toItem: view,
                   attribute: .bottom,
                   multiplier: 1.0,
                   constant: 0.0).isActive = true

let url = NSURL (string: "");
let requestObj = NSURLRequest(url: url! as URL);
webView.load(requestObj as URLRequest);
How to properly make a container view that contains some viewControllers(programmatically)?

How to properly make a container view that contains some viewControllers(programmatically)?


By : user2771893
Date : March 29 2020, 07:55 AM
hope this fix your issue To add a view controller to a container view programmatically, you need to call addSubview and didMove in addition to addChild.
code :
let firstViewController = FirstViewController()
addChild(firstViewController)
firstViewController.view.translatesAutoresizingMaskIntoConstraints = false
containerView.addSubview(firstViewController.view) // replace `containerView` with the name of the view that's supposed to contain the VC's view

// add constraints or set frame manually
let trailingConstraint = firstViewController.view.trailingAnchor.constraint(equalTo: view.trailingAnchor)
let leadingConstraint = firstViewController.view.leadingAnchor.constraint(equalTo: view.leadingAnchor)
let topConstraint = firstViewController.view.topAnchor.constraint(equalTo: view.topAnchor)
let bottomConstraint = firstViewController.view.bottomAnchor.constraint(equalTo: view.bottomAnchor)
NSLayoutConstraint.activate([trailingConstraint, leadingConstraint, topConstraint, bottomConstraint])

firstViewController.didMove(to parent: self)
let child = children.first // or other way to identify your VC
child?.willMove(toParentViewController: nil)
child?.view.removeFromSuperview()
child?.view.removeFromParentViewController()
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