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How can I both stroke and fill with NSAttributedString w/ UILabel4个
我正在尝试创建一个meme生成器应用程序,以更好地理解Swift,Xdode,代理和UIKit.我试图使用NSAttributedStringKey将meme文本的颜色设置为白色并使用黑色笔划.黑色笔划正在工作,但当用户从相机胶卷中选择图像时,不会应用前景色.我已经搜索了StackOverflow,但所有的解决方案都适用于Swift 3,而不是Swift 4.我哪里出错？
我正在尝试创建一个meme生成器应用程序,以更好地理解Swift,Xdode,代理和UIKit.我试图使用NSAttributedStringKey将meme文本的颜色设置为白色并使用黑色笔划.黑色笔划正在工作,但当用户从相机胶卷中选择图像时,不会应用前景色.我已经搜索了StackOverflow,但所有的解决方案都适用于Swift 3,而不是Swift 4.我哪里出错？
我在下面列出了我的源代码.
import UIKit
class ViewController: UIViewController,UIImagePickerControllerDelegate,UINavigationControllerDelegate {
@IBOutlet weak var imagePickerView: UIImageView!
@IBOutlet weak var cameraButton: UIBarButtonItem!
@IBOutlet weak var topText: UITextField!
@IBOutlet weak var bottomText: UITextField!
let memeTextAttributes:[String:Any] = [
NSAttributedStringKey.strokeColor.rawValue: UIColor.black,NSAttributedStringKey.foregroundColor.rawValue: UIColor.white,NSAttributedStringKey.font.rawValue: UIFont(name: "HelveticaNeue-CondensedBlack",size: 40)!,NSAttributedStringKey.strokeWidth.rawValue: 3.0]
override func viewDidLoad() {
super.viewDidLoad()
// Diable camer a button if camera ource isn't available
cameraButton.isEnabled = UIImagePickerController.isSourceTypeAvailable(.camera)
topText.defaultTextAttributes = memeTextAttributes
bottomText.defaultTextAttributes = memeTextAttributes
}
// MARK: Delegate Methods
func imagePickerController(_ picker: UIImagePickerController,didFinishPickingMediaWithInfo info: [String : Any]) {
if let image = info[UIImagePickerControllerOriginalImage] as? UIImage {
imagePickerView.image = image
self.dismiss(animated: true,completion: nil)
}
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
self.dismiss(animated: true,completion: nil)
}
@IBAction func pickAnImageFromAlbum(_ sender: Any) {
let pickerController = UIImagePickerController()
pickerController.delegate = self
pickerController.sourceType = .photoLibrary
present(pickerController,animated: true,completion: nil)
}
@IBAction func pickAnImageFromCamera(_ sender: Any) {
let imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = .camera
present(imagePicker,completion: nil)
}
}
解决方法
如果您也设置foregroundColor,请使用负strokeWidth.否则,只能看到中风.
let attributes = [
NSAttributedStringKey.strokeColor.rawValue: UIColor.black,NSAttributedStringKey.backgroundColor.rawValue: UIColor.red,NSAttributedStringKey.strokeWidth.rawValue: -4.5]
编辑：请参阅rmaddy关于为什么我们在下面的情况下需要rawValue的评论.
