我是iOS編程的新手,並試圖在Swift tutorial開發「FoodTracker」。以下是我的所有代碼。UIImageVIew.image不會改變
import UIKit
class ViewController: UIViewController, UITextFieldDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
//MARK: Properties
@IBOutlet weak var nameTextField: UITextField!
@IBOutlet weak var mealNameLabel: UILabel!
@IBOutlet weak var photoImageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
nameTextField.delegate = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//MARK: Actions
@IBAction func selectImageFromPhotoLibrary(sender: UITapGestureRecognizer) {
// Hide the keyboard.
nameTextField.resignFirstResponder()
//UIImagePickerController is a view controller that lets a user pick media from their photo library.
let imagePickerController = UIImagePickerController()
//Only allow photos to be picked, not taken.
imagePickerController.sourceType = .PhotoLibrary
//Make sure ViewController is notified when the user picks an image.
imagePickerController.delegate = self
presentViewController(imagePickerController, animated: true, completion: nil)
}
@IBAction func setDefaultLabelText(sender: UIButton) {
mealNameLabel.text = "Default Text"
}
//MARK: UIImagePickerControllerDelegate
func imagePickerControllerDidCancel(picker: UIImagePickerController) {
//Dismiss the picker if the user canceled.
dismissViewControllerAnimated(true, completion: nil)
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithinfo info: [String : AnyObject]) {
//The info dictionary contains multiple representations of the image, and this uses the original.
let selectedImage = info[UIImagePickerControllerOriginalImage] as? UIImage
photoImageView.image = selectedImage
// Dismiss the picker.
dismissViewControllerAnimated(true, completion: nil)
}
//MARK: UITextFieldDelegate
func textFieldShouldReturn(textField: UITextField) -> Bool {
//hide the keyboard.
textField.resignFirstResponder()
return true
}
func textFieldDidEndEditing(textField: UITextField) {
mealNameLabel.text = textField.text
}
}
該應用程序正常執行,但圖像無法更改。 正常的過程是點擊圖像>從相機膠捲中選擇任何圖像>更改待機屏幕的圖像。問題是最後一步,「改變閒置屏幕的圖像」。 哪一點是我的錯誤?我一次又一次地將我的代碼與示例代碼在教程中進行了比較,但我找不到有用的東西。請幫幫我。
哦,斷點?我沒有想到這一點。這可能是一個不錯的選擇,但爲時已晚。 :-(儘管如此,這對我來說是個好主意,我將在下一次使用這個技能,非常感謝你〜 –