Thanks in advance to all. I am sure I am doing something stupid here. This is a macOS project and I am trying to update an image view using a variable, not the quoted name of the image as done here:
self.myAppIcon.image = NSImage(named:"microsoft.png")
That works fine and the app will show the default image on load and then change to the named image ("microsoft.png") when requested. However, when I try to get it to use a variable in the place of the quoted string, I am not getting the app to update to image.
I assumed I could just use something like:
self.myAppIcon.image = NSImage(named: self.theIcon)
where theIcon is set by loading a string from a file read from disk. All the images are in the project and all load is called explicitly. Here I am reading from a file to get the image name:
let myIcon = try String(contentsOf: iconURL, encoding: .utf8)
self.theIcon = myIcon
When I print myIcon I see the value being read properly from the text file. Changing the text file will show the new value on next call. However, the image view does not update. I've tried quite a few variations but either I get a class mismatch (image not string, data not string, etc), or I thow execution errors.
How do I reference a variable to allow the NSImage to update based on a dynamic value? Isn't NSImage(named: String) a string value? Shouldn't I be able to replace that quoted String with a variable that is a string?
Appreciate any help. I suspect this is a remarkably simple solution but I am too deep into the forest to see the trees at this point and likely need to step away.
Thanks for helping out. Here is what I am doing:
//Set the variable
var theIcon:String = ""
//Connect the outlet
@IBOutlet weak var myAppIcon: NSImageView!
//Set name of file
let icon = "icon.txt"
//Read the contents of the file
if let dir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first {
let iconURL = dir.appendingPathComponent(icon)
do {
let myIcon = try String(contentsOf: iconURL, encoding: .utf8)
self.theIcon = myIcon
print(myIcon)
}
catch {/* error handling here */}
}
//Update the UI
DispatchQueue.main.async {
print("update some UI")
self.myAppIcon.image = NSImage(named: self.theIcon)
}
The file, icon.txt, contains the full name of the file. For example, microsoft.png or printer.png. I can update the file while the app is running and the value is printed to the output window.
printers.png
update some UI
Am i dealing with a new line issue here?
Oh my oh my. I am such a doofus. It was the newline! I was using echo to test updating the file and I did not use -n. All along the issue was bad input from the file because I was getting microsoft.png\n not microsoft.png. I am kicking myselft for failing to pay attention to the gapping white space between the logging output.
Thank you for making be take a break and also looking at the obvious.
