Do something before UIImageWriteToSavedPhotosAlbum function ios - ios

Question

Now I have a question that if we don't have the access to save photo into album, the app will crash. So I want to ask for the access at the beginning. But if the Users select NO, the app will crash when the app is saving photos. So I want to judge whether we have the access before using UIImageWriteToSavedPhotosAlbum function. Except adding codes before per UIImageWriteToSavedPhotosAlbum function, any else methods can be used?

Answer 1

It's crashing because you need to set
NSPhotoLibraryUsageDescription
in info.plist file
then after use following code to check access of gallery
PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
if (status == PHAuthorizationStatusAuthorized) {
// Access has been granted.
NSLog(#"Access Granted");
UIImage *myImage = [UIImage imageNamed:#"Mobile.png"];
UIImageWriteToSavedPhotosAlbum(myImage, self, #selector(image:didFinishSavingWithError:contextInfo:), nil);
}
else if (status == PHAuthorizationStatusDenied) {
// Access has been denied.
NSLog(#"Access NOT Granted");
UIAlertController* alert = [UIAlertController alertControllerWithTitle:#"Not Granted"
message:#"You have not granted permission for a gallery to save photos, Please grant it from setting"
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction* defaultAction = [UIAlertAction actionWithTitle:#"OK" style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action) {}];
[alert addAction:defaultAction];
[self presentViewController:alert animated:YES completion:nil];
}
else if (status == PHAuthorizationStatusNotDetermined) {
// Access has not been determined.
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
if (status == PHAuthorizationStatusAuthorized) {
UIImage *myImage = [UIImage imageNamed:#"Mobile.png"];
UIImageWriteToSavedPhotosAlbum(myImage, self, #selector(image:didFinishSavingWithError:contextInfo:), nil);
}
else {
// Access has been denied.
}
}];
}
else if (status == PHAuthorizationStatusRestricted) {
// Restricted access - normally won't happen.
}
Don't forget to #import <Photos/Photos.h>
Don't forget to implement this method
- (void) image:(UIImage*)image didFinishSavingWithError:(NSError *)error contextInfo:(NSDictionary*)info{
}