仅供参考:我是Swift的新手,所以这可能是一个非常简单的问题,但我 无法弄清楚。
我一直在关注 使用Xcode 8 beta和Swift 3 的《开始开发iOS应用程序 (Swift) 教程》。
我将Tap Gesture Recognizer附加到了Image View,然后 在ViewController.swift中添加了此操作:
@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 present(imagePickerController, animated: true, completion: nil) }
在图像 视图上轻按以调用selectImageFromPhotLibrary动作时,应用程序崩溃而未显示ImagePicker。
我想问题出在新的present而不是Swift 3中引入的 presentViewController
ViewController.swift
import UIKit class ViewController: UIViewController, UITextFieldDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate { // MARK: Properties @IBOutlet weak var mealNameLabel: UILabel! @IBOutlet weak var nameTextField: UITextField! @IBOutlet weak var photoImageView: UIImageView! override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. // Handle the text field´s user input through delegate callbacks nameTextField.delegate = self } // MARK: UITextFieldDelegate func textFieldShouldReturn(_ textField: UITextField) -> Bool { // Hide the keyboard. textField.resignFirstResponder() return true } func textFieldDidEndEditing(_ textField: UITextField) { mealNameLabel.text = textField.text } // MARK: UIImagePickerControllerDelegate func imagePickerControllerDidCancel(_ picker: UIImagePickerController) { // Dismiss the picker if the user canceled. dismiss(animated: 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 // Set photoImageView to display the selected image. photoImageView.image = selectedImage // Dismiss the picker. dismiss(animated: true, completion: nil) } // 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 present(imagePickerController, animated: true, completion: nil) } @IBAction func setDefaultLabelText(_ sender: UIButton) { mealNameLabel.text = "Default Text" } }
Console Output
2016-06-20 17:08:20.568093 FoodTracker[33322:696094] bundleid: com.armin.FoodTracker, enable_level: 0, persist_level: 0, propagate_with_activity: 0 2016-06-20 17:08:20.569458 FoodTracker[33322:696094] subsystem: com.apple.UIKit, category: HIDEvents, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 0, privacy_setting: 0 2016-06-20 17:08:20.604909 FoodTracker[33322:696090] Created DB, header sequence number = 288 2016-06-20 17:08:20.668341 FoodTracker[33322:696090] Created DB, header sequence number = 288 2016-06-20 17:08:20.743143 FoodTracker[33322:696090] subsystem: com.apple.BaseBoard, category: MachPort, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 0, privacy_setting: 0 2016-06-20 17:08:20.769881 FoodTracker[33322:696091] subsystem: com.apple.FrontBoard, category: Common, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 0, privacy_setting: 0 2016-06-20 17:08:22.007665 FoodTracker[33322:695971] subsystem: com.apple.UIKit, category: Touch, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 0, privacy_setting: 0 2016-06-20 17:08:22.009799 FoodTracker[33322:695971] subsystem: com.apple.UIKit, category: Gesture, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 0, privacy_setting: 0 2016-06-20 17:08:22.012973 FoodTracker[33322:695971] subsystem: com.apple.UIKit, category: GestureEnvironment, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 0, privacy_setting: 0 2016-06-20 17:08:22.013820 FoodTracker[33322:695971] subsystem: com.apple.UIKit, category: GestureExclusion, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 0, privacy_setting: 0 2016-06-20 17:08:23.061815 FoodTracker[33322:695971] subsystem: com.apple.photos, category: Generic, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 0, privacy_setting: 0
将此密钥添加到您的中 info.plist,
info.plist
Key : Privacy - Photo Library Usage Description [ NSPhotoLibraryUsageDescription ] String Value : We need access to your camera roll and photo library, so that we can do operations on it. [ Customise it in your own way]
That’s it, Clean & Run the project.
Clean & Run