Detected missing constraints for NSTextView - swift

Question

I have created a Document-based application that should save an NSAttributedString with a image into a package. I ran the application and added a image to the text view and saved it. When I opened the file, a dialog box said "the document 'x' could not be opened" and this was printed to the console:
[Layout] Detected missing constraints for <NSTextField: 0x100b3f480>. It cannot be placed because there are not enough constraints to fully
define the size and origin. Add the missing constraints, or set
translatesAutoresizingMaskIntoConstraints=YES and constraints will be generated for you. If this view is laid out manually on macOS 10.12 and later,
you may choose to not call [super layout] from your override. Set a breakpoint on DETECTED_MISSING_CONSTRAINTS to debug. This error will only be logged once.
Document.swift:
enum CookRecipesFileNames : String {
case notes = "Notes.rtfd"
}
class Document: NSDocument {
var documentFileWrapper = FileWrapper(directoryWithFileWrappers: [:])
var popover : NSPopover?
var notes : NSAttributedString = NSAttributedString()
...
override class func autosavesInPlace() -> Bool {
return true
}
override func fileWrapper(ofType typeName: String) throws -> FileWrapper {
let notesRTFdata = try self.notes.data(from: NSRange(0..<self.notes.length), documentAttributes: [NSDocumentTypeDocumentAttribute: NSRTFDTextDocumentType])
if let oldTextFileWrapper = self.documentFileWrapper.fileWrappers?[CookRecipesFileNames.notes.rawValue] {
self.documentFileWrapper.removeFileWrapper(oldTextFileWrapper)
}
self.documentFileWrapper.addRegularFile(withContents: notesRTFdata, preferredFilename: CookRecipesFileNames.notes.rawValue)
return self.documentFileWrapper
}
override func read(from fileWrapper: FileWrapper, ofType typeName: String) throws {
guard let documentNotesData = fileWrappers[CookRecipesFileNames.notes.rawValue]?.regularFileContents else {
throw err(.cannotLoadNotes)
}
guard let documentNotes = NSAttributedString(rtfd: documentNotesData, documentAttributes: nil) else {
throw err(.cannotLoadNotes)
}
self.documentFileWrapper = fileWrapper
self.notes = documentNotes
}
}
Any help would be appreciated!

Answer 1

The warning 'Detected missing constraints...' is a Build Warning, telling you that you have added constraints to a view, but not enough to determine x and y coords, and height and width for the view. If you add no constraints in IB (an option here is to remove them all), Xcode will tell the app to use the exact position and dimensions used in IB. If you add ANY constraints to a view, you must add enough to determine both coordinates and both dimensions. If you want to keep your constraints (this is the second option), go to IB, and look for the yellow or red warning error, at the top left:
This will give you a list of missing and conflicting restraints in the View Controller.