UIAlertAction Button Text Alignment Left

You can do that with bellow example code. Easy and Simple.

Swift 4

let actionSheetAlertController: UIAlertController = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)

let cancelActionButton = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
actionSheetAlertController.addAction(cancelActionButton)


let documentsActionButton = UIAlertAction(title: "Documents", style: .default, handler: nil)
actionSheetAlertController.addAction(documentsActionButton)
documentsActionButton.setValue(#imageLiteral(resourceName: "doccument"), forKey: "image")
documentsActionButton.setValue(kCAAlignmentLeft, forKey: "titleTextAlignment")

let cameraActionButton = UIAlertAction(title: "Camera", style: .default, handler: nil)
actionSheetAlertController.addAction(cameraActionButton)
cameraActionButton.setValue(#imageLiteral(resourceName: "camera"), forKey: "image")
cameraActionButton.setValue(kCAAlignmentLeft, forKey: "titleTextAlignment")

let galleryActionButton = UIAlertAction(title: "Gallery", style: .default, handler: nil)
actionSheetAlertController.addAction(galleryActionButton)
galleryActionButton.setValue(#imageLiteral(resourceName: "gallery"), forKey: "image")
galleryActionButton.setValue(kCAAlignmentLeft, forKey: "titleTextAlignment")

actionSheetAlertController.view.tintColor = kTHEME_COLOR
self.present(actionSheetAlertController, animated: true, completion: nil)

An updated version to swift 5.0 of kCAAlignmentLeft (as answered by @Niraj Solanki here) is CATextLayerAlignmentMode.left So the code should be as below:

Swift 5.0

documentsActionButton.setValue(CATextLayerAlignmentMode.left, forKey: "titleTextAlignment")

fastest and simplest implementation for this case:

extension UIAlertAction {
    func addImage(_ image: UIImage){
        setValue(image, forKey: "image")
        setValue(0, forKey: "titleTextAlignment")
    }
}

using:

let editAction = UIAlertAction(title: "Edit", style: .default, handler: nil)
editAction.addImage(UIImage(systemName: "square.and.pencil")!)
alertSheet.addAction(editAction)

NOTE: CATextLayerAlignmentMode — is not what you need. Because right alignment doesn't work with it! Better use numeric literals:

• 0 - left
• 1 - center
• 2 - right

for universal use i would create this enum:

enum AlertActionAlignment:Int {
    case left, center, right
}

...
setValue(align.rawValue, forKey: "titleTextAlignment")

As already said in comments, UIAlertController do not provide customization of its view. However, you can build your own action sheet view or use some third parties, like https://github.com/xmartlabs/XLActionController.