why is UIImage(contentsOfFile: "path") retaining memory

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Created Oct ’21

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The memory used jumps to 498 megs when image is loaded but not displayed and drops to 242 megs when viewcontroller is dropped with nav controllers back button.

UIImage(contentsOfFile: is not supposed to cache, i assume that is where the 240 meg drop is from, but why is half of memory used, 240 megs, being retained?

func save_ImageJPG() -> Bool {

// load tif from app folder image approx 8000 x 6000 pixels let s = currentMap_Name.replacingOccurrences(of: " ", with: "%20")

let filePath = getDocumentsDirectory().appendingPathComponent("Folder" ).appendingPathComponent(s)

let image = UIImage(contentsOfFile: filePath.path) // change file type to jpg let f = URL(string: s)?.deletingPathExtension().absoluteString

let e = URL(string: f! + ".jpg")?.absoluteString let path = getDocumentsDirectory().appendingPathComponent("TempFolder" ).appendingPathComponent(e!)

if !FileManager.default.fileExists(atPath: path.path) { let jpgData = (image!.jpegData(compressionQuality: 1.0)!) try? jpgData.write(to: path) return true } return false }

or is the let jpgData = (image!.jpegData(compressionQuality: 1.0)!) retaining memory?

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Answer 1

robnotyou OP

Oct ’21

Please can you put your code into a code block (using "Paste and Match Style"), to make it more readable?

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Answer 2

TerryB77 OP

Oct ’21

func save_ImageJPG() -> Bool { // load tif from app folder image approx 8000 x 6000 pixels let s = currentMap_Name.replacingOccurrences(of: " ", with: "%20") let filePath = getDocumentsDirectory().appendingPathComponent("Folder" ).appendingPathComponent(s) let image = UIImage(contentsOfFile: filePath.path) // change file type to jpg let f = URL(string: s)?.deletingPathExtension().absoluteString let e = URL(string: f! + ".jpg")?.absoluteString let path = getDocumentsDirectory().appendingPathComponent("TempFolder" ).appendingPathComponent(e!) if !FileManager.default.fileExists(atPath: path.path) { let jpgData = (image!.jpegData(compressionQuality: 1.0)!) try? jpgData.write(to: path) return true } return false }

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Answer 3

robnotyou OP

Nov ’21

To format the code correctly, you need to paste it into the original question, or a new reply, not a comment.

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