How display picture in a IOS app? - ios

Question

I'm a beginner to build an IOS app and I want to know the good practice to display user picture on my app. I searched on google if some practice or document talk about that but i found nothing... My question mark is:
What is the common ratio to use when we want a "portrait picture" or "selfie"?
For my app I need to display a fixed ratio image and I would like authorize the user to crop the image, so do you know a library to help me to do that?
Thanks for your reply

Answer 1

this is what i'm using :
displayPhotoImageView is uiimageView photo loads on it
var newpic:Bool?
func photoAction(){
let myalert=UIAlertController(title:"",message:"choose photo ",preferredStyle: .actionSheet)
let camerAction=UIAlertAction(title:"camera",style:.default){(action) in
if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.camera) {
let imagepicker = UIImagePickerController()
imagepicker.delegate = self
imagepicker.sourceType = UIImagePickerControllerSourceType.camera
imagepicker.mediaTypes = [kUTTypeImage as! String]
imagepicker.allowsEditing = false
self.present(imagepicker, animated: true, completion: nil)
self.newpic = true
}
}
// let camerRollAction=UIAlertController(title:"",message:"",preferredStyle: .actionSheet)
let camerRollAction=UIAlertAction(title:"Gallery",style:.default){(action) in
if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.photoLibrary) {
let imagepicker = UIImagePickerController()
imagepicker.delegate = self
imagepicker.sourceType = UIImagePickerControllerSourceType.photoLibrary
imagepicker.mediaTypes = [kUTTypeImage as! String]
imagepicker.allowsEditing = false
self.present(imagepicker, animated: true, completion: nil)
self.newpic = true
}
}
myalert.addAction(camerAction)
myalert.addAction(camerRollAction)
self.present(myalert, animated: true, completion: nil)
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
let mediatype = info[UIImagePickerControllerMediaType] as! NSString
if mediatype.isEqual(to: kUTTypeImage as! String) {
let image=info[UIImagePickerControllerOriginalImage] as! UIImage
displayPhotoImageView.image = image
let imageData:NSData = UIImagePNGRepresentation(image)! as NSData
data = imageData.base64EncodedString(options: .lineLength64Characters)
if newpic == true {
UIImageWriteToSavedPhotosAlbum(image, self, #selector(imageError), nil)
}
}
self.dismiss(animated: true, completion: nil)
}
func imageError(image:UIImage,didFinishSavingWithError error:NSErrorPointer,ContextInfo:UnsafeRawPointer){
if error != nil {
let alert=UIAlertController(title: "error ", message: " unable ", preferredStyle: .alert)
let ok=UIAlertAction(title: "ok", style: .cancel, handler:nil )
alert.addAction(ok)
self.present(alert, animated: true, completion: nil)
}
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
self.dismiss(animated: true, completion: nil)
}
you need Privacy - Camera Usage Description and Privacy - Photo Library Usage Description permission