How do I prevent files from being backed up to iCloud and iTunes from my iOS app using Swift or ObjectiveC

Objective C:

- (BOOL)addSkipBackupAttributeToItemAtURL:(NSURL *)URL
{
    assert([[NSFileManager defaultManager] fileExistsAtPath: [URL path]]);
   
    NSError *error = nil;
    BOOL success = [URL setResourceValue:[NSNumber numberWithBool: YES]
                                  forKey: NSURLIsExcludedFromBackupKey error: &error];
    if(!success){
        NSLog(@"Error excluding %@ from backup %@", [URL lastPathComponent], error);
    }
    return success;
}

Swift 3.0:

    func addSkipBackupAttributeToItemAtURL(filePath:String) -> Bool
       
    {
       let URL:NSURL = NSURL.fileURL(withPath: filePath) as NSURL
        assert(FileManager.default.fileExists(atPath: filePath), "File \(filePath) does not exist")
        var success: Bool
       
        do {
            try URL.setResourceValue(true, forKey:URLResourceKey.isExcludedFromBackupKey)
            success = true
        } catch let error as NSError {
           success = false
          print("Error excluding \(URL.lastPathComponent) from backup \(error)");
       }
        return success
    }

Xcode 8 iOS Simulator Activity Logging Tracing

Xcode 8 iOS application run on simulator we see lots of debugging messages, which are call Activity tracing.
Now we are learning, how to Activity logging tracing enable and disable:

Editor Scheme

argument setting

Now are add environment add (+):
name:OS_ACTIVITY_MODE
value:disable

activity mode set

Now have a look your simulator debugging section, system logging is not showing, If want to deactivate this feature just uncheck, not to remove OS_ACTIVITY_MODE.

UIimagePickerController Example using Swift 3

UIimagePickerController using we grab photo from photo library or take a picture using camera.

At first we need to add some protocol for UIImagePickerController like UIImagePickerControllerDelegate and UINavigationControllerDelegate on our ViewController.

Looks like
class ViewController: UIViewController,UIImagePickerControllerDelegate,UINavigationControllerDelegate {
}

Image Picker Setup for photo library and camera

    //MARK: Action
    @IBAction func imagePickFromPhotoLib(_ sender: UIButton) {
        let imagePickerController = UIImagePickerController()
        // imagePickerController.allowsEditing = true
        imagePickerController.delegate = self
        imagePickerController.sourceType = .photoLibrary
        present(imagePickerController, animated: true, completion: nil)
    }

    @IBAction func imagePickFromCamera(_ sender: UIButton) {
        let imagePickerController = UIImagePickerController()
        imagePickerController.sourceType = .camera
        imagePickerController.allowsEditing = true
        imagePickerController.cameraDevice = .front
        imagePickerController.cameraFlashMode = .auto
        imagePickerController.delegate = self
        present(imagePickerController, animated: true, completion: nil)
    }

Then we need to implement delegate

   //MARK: UIImagePickerDelegate
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        picker.dismiss(animated: true, completion: nil)
    }

      func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo  info: [String : Any]) {
       
        let selectedImage = info[UIImagePickerControllerOriginalImage] as! UIImage
        // picker selected image use on what ever we need
        picker.dismiss(animated: true, completion: nil)
    }

Info.plist file add those key 

Privacy - Camera Usage Description
Privacy - Photo Library Usage Description


Here demo project on git.

Email validation in swift

    func validateEmail(emailAddress:String)->Bool{

        let emailRegularExpression = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}"
       
        let emailValidationPredicate = NSPredicate(format: "SELF MATCHES %@", emailRegularExpression)
       
        return emailValidationPredicate.evaluate(with: emailAddress)
       
    }

Introduction to UIAlertController, Swift 3.0.

    let learningAlertController = UIAlertController(title: "Hello!!!", message: "I'm alert controller", preferredStyle: .alert)

    let okAlertAction = UIAlertAction(title: "OK", style: .default) { (action:UIAlertAction) in
        print("You've pressed OK button");
    }
    learningAlertController.addAction(okAlertAction)
    present(learningAlertController, animated: true, completion: nil)