[英]I want to let users choose either taking a photo using camera or picking a photo from library(ios-swift, apple example- foodtracker)
我正在玩ios swift foodtracker的例子。 默认的最终示例仅允许用户从库中选择照片。 但我希望他们用相机拍照。 所以我尝试了下面的代码,但它没有改变功能。 它仍然没有询问用户的选项偏好(相机/ photolibrary)进入照片库。
我收到以下错误消息:
尝试在取消分配时加载视图控制器的视图是不允许的,并且可能导致未定义的行为()
这是我使用的代码:
@IBAction func selectImageFromPhotoLibrary(sender: AnyObject) {
// Hide the keyboard.
nameTextField.resignFirstResponder()
// UIImagePickerController is a view controller that lets a user pick media from their photo library.
let imagePickerController = UIImagePickerController()
imagePickerController.delegate = self
let alert = UIAlertController(title: nil, message: nil, preferredStyle: .ActionSheet)
alert.addAction(UIAlertAction(title: "Camera", style: .Default, handler: {
action in
imagePickerController.sourceType = .Camera
self.presentViewController(imagePickerController, animated: true, completion: nil)
}))
alert.addAction(UIAlertAction(title: "Photo Library", style: .Default, handler: {
action in
imagePickerController.sourceType = .PhotoLibrary
self.presentViewController(imagePickerController, animated: true, completion: nil)
}))
alert.addAction(UIAlertAction(title: "Cancel", style: .Cancel, handler: nil))
presentViewController(imagePickerController, animated: true, completion: nil)
}
确保你使用的是导航控制器,如果不是只是通过转到你的storyBoard嵌入它 - >选择你的初始ViewController然后编辑 - >嵌入 - >导航控制器
要使用imagePicker,请使用此: -
class ViewController : UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate{
.....
.....
.....
var imagePicker : UIImagePickerController!
//Defined it globally in the class
..
..
override func viewDidLoad() {
super.viewDidLoad()
imagePicker = UIImagePickerController()
self.imagePicker.delegate = self
//Initialise it in viewDidLoad
...
}
//In your 'selectImageFromPhotoLibrary' function : -
@IBAction func selectImageFromPhotoLibrary(sender: AnyObject) {
let alertController : UIAlertController = UIAlertController(title: "Camera / Photo Album ", message: "", preferredStyle: UIAlertControllerStyle.ActionSheet)
let cameraAction : UIAlertAction = UIAlertAction(title: "Camera", style: UIAlertActionStyle.Default) { (UIAlertAction) -> Void in
if (UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera)) {
self.imagePicker.sourceType = UIImagePickerControllerSourceType.Camera
} else {
print("Camera not available")
}
self.present()
}
alertController.addAction(cameraAction)
let photoLibraryAction : UIAlertAction = UIAlertAction(title: "Photo Library", style: UIAlertActionStyle.Default) { (UIAlertAction) -> Void in
if (UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.PhotoLibrary)) {
self.imagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
} else {
print("Photo Library not available")
}
self.present()
}
alertController.addAction(photoLibraryAction)
alertController.popoverPresentationController?.sourceView = view
alertController.popoverPresentationController?.sourceRect = view.frame
presentViewController(alertController, animated: true, completion: nil)
}
...
...
// After you are done picking up image , this function will be automatically be called.
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
print("info reached")
imagePicker.dismissViewControllerAnimated(true, completion: nil)
//Now do whatever you want to do with your picked image.
}
//For presenting the imagePicker Controller.
func present(){
self.presentViewController(self.imagePicker, animated: true, completion: nil)
}
}
如果你不知道如何提取图像只需检查这个链接: Swift - UIImagePickerController - 如何使用它? https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIImagePickerController_Class/
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