When I go to view my SwiftUI through the canvas preview in Xcode 11.3.1 I am getting the error
Compiling failed: 'Color' is only available in iOS 13.0 or newer
But the project itself builds successfully and the simulator loads without any issues. I have tried clearing the build folder, quitting Xcode and rebuilding but still no luck.
Any help would be great. Thanks in advance.
SwiftUI minimum deployment target is 13.0, so if you have project with support of older version, then all SwiftUI code (including preview providers) you have to prepend with availability modifier, like
#available(iOS 13.0, *) // << here !!
struct Demo: View {
var body: some View {
VStack {
Text("Hello")
}
}
}
You Should use Assets or Other option like Color Literal for Color.
Don't use the system Color option since your deployment target is 11.4.
Man, I've had a similar issue. The problem was that sometimes my preview worked sometimes it didn't... I reviewed the diagnostics and realized that there are some #_dynamicReplacement attributes mentioned (which are used, I guess, for hot reloading). It wasn't working when I've had a file with #available attributes opened in the (adjacent) editor. When I closed that editor everything worked back again.
Magic ✨
Also one more hint from my friend - when you have a file from another target (not the one hosting your Canvas-related code) in (adjacent) editor it behaves the same way.
Related
My stepper is defined as follows (Standalone WatchOS app)
Stepper(value: $myCount) {
Text("\(myCount)").font(.footnote).accessibilityIdentifier("count_label")
}.accessibilityIdentifier("my_stepper")
It is fully functional on the real / simulator devices. During a test case, defined below, I am unable to invoke the increment button. (I get an error and the button itself is not hittable, ever)
XCTAssertTrue(app.steppers["my_stepper"].waitForExistence(timeout: 10))
XCTAssertFalse(app.steppers["my_stepper"].buttons["Remove"].isEnabled)
XCTAssertTrue(app.steppers["my_stepper"].buttons["Add"].isEnabled)
-> (Error) app.steppers["my_stepper"].buttons["Add"].tap()
Error kAXErrorCannotComplete performing AXAction
kAXScrollToVisibleAction on element AX element pid
I tried to forceTap (using coordinates) with no luck. Any idea how to invoke the increment action?
While the increment and decrement buttons exist in the view stack, they are not hittable. Likely a bug in SwiftUI that impacts either WatchOS or all platforms. Best way I have found to temporarily get past the issue is using the following tutorial :
app.steppers["my_stepper"].coordinate(withNormalizedOffset: CGVector(dx: 0.9, dy: 0.5)).tap()
This is a workaround that will probably fail on different devices. For me, it would only work with Ultra 49mm watchOS 9.0. Accepting this until a better answer is found.
there's a lot of code in here but please be patient I will try to explain my question
so i am trying to convert Apple's AvDepthCapture project which is in UIKit as a SwiftUI project, so i copied all the supporting files, i will attach the image for the same below, the shaders folder contain the metal files for applying filters
so I created a class same as the cameraviewcontroller and added all the properties as follows -
class CameraViewController: UIViewController, AVCapturePhotoCaptureDelegate, AVCaptureVideoDataOutputSampleBufferDelegate, AVCaptureDepthDataOutputDelegate, AVCaptureDataOutputSynchronizerDelegate, ObservableObject {
private var previewView: PreviewMetalView!
}
now when i run my app on my device it asks for camera permission but then shows a white screen instead of opening the camera and the PreviewMetalView file that i copied earlier directly from the original UIKit project,
the declaration is causing error
private var previewView: PreviewMetalView!
this line, it quits my app and says unexpectedly found nil when unwrapping an optional value but the code is the same as that of the UIKit project and UIKit project works perfectly fine on my device then why is it throwing this error!?, please help i can provide both the UIKit project and my SwiftUI project file if you want to see i really can't figure it out
there's a lot of code but this specific line is throwing error, I declared a type of PreviewMetalView but now PreviewMetalView has an initialiser which takes in a type NSCoder so what should I write there ??
like I would be declaring my variable as
var previewView = PreviewMetalView(coder: NSCoder)
what to put in place of NSCoder ?
when I opened the original UIKit project the previewView is defined as an IBOutlet to a Container View which is then linked to the CameraViewController but I cannot find where is it initialised please help!
I have one SwiftUI - iOS app running, and I need to open the link from email/whatsapp/etc in my app.
So lets say the link is like this (from my website):
https://www.mapplebook.com/welcome;id=123
I have tried the custom Scheme, which works fine, but for that i need to do something like: myScheme://www.mapplebook.com/etc....
Which is bad because Website and Android only understand things without the scheme.
The universal link looks like the best approach, I read a couple of things about Apple docs and some other questions, but could not make it work. :(
Is there any suggestion? Maybe some tutorial that I am missing.
Any help is much appreciated.
Editing the question as requested:
This is my info.plist - In this case I am using the custom scheme mapplebook
In SceneDelegate.swift, I have the followng:
func scene(_ scene: UIScene, openURLContexts URLContexts: Set<UIOpenURLContext>) {
guard let url = URLContexts.first?.url else {
return
}
if let range = url.absoluteString.range(of:"https//www.mapplebook.com/id=") {
let sharedtoken = url.absoluteString[range.upperBound...]
//with sharedtoken i can redirect internally and open the correct view - working okay
}
}
But, as mentioned, that uses scheme mapplebook right?
Is it possible to have something like in android, where we say like:
android:host="mapplebook.com"
android:pathPattern="/something"
android:scheme="https" />
So it ask to open the https://mapplebook.com/something url in my app.
Thank you Koen for helping.
I do have a strange issue in using the reorder feature in my app's UICollectionView. We have a custom layout which is implemented to show a decoration view. The collection view uses a flow based layout. When I move the first cell from its position to last cell position for reordering of the cells, the app crashes before it calls the collection view delegate's collectionView(moveItemAt: to) method.
Attached the stack trace of this issue. You can see that crash is happening in the bridging between NSIndexPath and IndexPath. I am not sure why it is happening inside UIKit. Searching for this issue found that it appears to be bug inside UIKIt which got introduced in Swift 3.0. I tested my old build which was built before swift 3.0 migration and it works without any crashes.
Can someone tell me how can I fix this issue?
Related bugs links
UICollectionView broken after Swift 3 migration?
https://bugs.swift.org/browse/SR-2103
https://bugs.swift.org/browse/SR-2417
func handleLongGesture(_ gesture: UILongPressGestureRecognizer) {
switch(gesture.state) {
case UIGestureRecognizerState.began:
if let movingPageIndexPath = collectionView.indexPathForItem(at: gesture.location(in: collectionView)) {
collectionView.beginInteractiveMovementForItem(at: movingPageIndexPath)
}
case UIGestureRecognizerState.changed:
collectionView.updateInteractiveMovementTargetPosition(gesture.location(in: collectionView))
case UIGestureRecognizerState.ended:
collectionView.endInteractiveMovement()
default:
collectionView.cancelInteractiveMovement()
}
}
After the Swift 3 update, I'm having some trouble getting my app to compile. Most of the errors are pretty simple to fix, but I'm running into a few in particular with AWS. Is there some sort of updated AWS SDK for Swift 3? I've tried to look it up, but haven't found one. In any case, the two main errors I'm having trouble resolving are as follows:
"Type 'IdentityProviderManager' does not conform to protocol AWSIdentityProviderManager." This is for a class I created following a tutorial to set up logins through AWS Cognito. The code is:
class IdentityProviderManager: NSObject, AWSIdentityProviderManager{
var tokens : [NSString : NSString]?
init(tokens: [NSString : NSString]) {
self.tokens = tokens
}
#objc func logins() -> AWSTask<AnyObject> {
return AWSTask(result: tokens as AnyObject)
}
}
In the AWS documentation for AWSIdentityProviderManager, it says that the only required function is logins, which I have. Is there a simple way to resolve this that I'm missing?
The other error is in my LoginViewController class: "Type 'LoginViewController' does not conform to protocol 'AWSCognitoIdentityPasswordAuthentication'." Here the issue seems a bit more clear, since the documentation says that getPasswordAuthenticationDetails() is a required method and XCode seems to have changed this method to getDetails() when updating to Swift 3, unless I'm mistaken and it wasn't there to begin with or something. In any case, autocomplete doesn't give me the original method and I can't seem to make the class conform to the protocol.
Apologies if the answer is already in documentation somewhere, but as far as I can tell it seems like the AWS SDK (at least the version that I have) is somehow incompatible with Swift 3. Is there something I can do to resolve these errors?
Nevermind, it turned out XCode just wasn't showing me the option to make the changes I needed. The automatic fix implemented slightly different versions of the required functions and everything ended up working.