如何讓用戶從他的相機膠捲或照片庫中選擇一張照片？

Question

我正在製作一個小照片編輯應用程序的樂趣。用戶必須從相機膠捲中選擇一張照片，然後將其導入進行修改。

這通常如何工作？我看到許多應用程序允許使用標準控制器，看起來總是相同的。

是否也可以直接訪問該庫或定製該控制器的外觀？

我應該從哪裏開始尋找？

Answer 1

我上的應用程序，允許用戶選擇一個個人形象的工作。我有兩個UIButtons可以幫助用戶選擇一張照片，無論是來自相機還是圖書館。這件事情是這樣的：

- (void)camera { 
if(![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){ 
    return; 
} 
UIImagePickerController *picker = [[[UIImagePickerController alloc] init] autorelease]; 
picker.sourceType = UIImagePickerControllerSourceTypeCamera; 
//Permetto la modifica delle foto 
picker.allowsEditing = YES; 
//Imposto il delegato 
[picker setDelegate:self]; 

[self presentModalViewController:picker animated:YES]; 
} 
- (void)library { 
//Inizializzo la classe per la gestione della libreria immagine 
UIImagePickerController *picker = [[[UIImagePickerController alloc] init] autorelease]; 
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; 
//Permetto la modifica delle foto 
picker.allowsEditing = YES; 
//Imposto il delegato 
[picker setDelegate:self]; 

[self presentModalViewController:picker animated:YES]; 
} 

您必須實現UIImagePickerControllerDelegate：

@interface PickPictureViewController : UIViewController <UIImagePickerControllerDelegate> 

@implementation PickPictureViewController 

#pragma mark UIImagePickerController Delegate 
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{ 
UIImage *pickedImage = [info objectForKey:UIImagePickerControllerEditedImage]; 
if (picker.sourceType == UIImagePickerControllerSourceTypeCamera) { 
    UIImageWriteToSavedPhotosAlbum(pickedImage, self, @selector(image:didFinishSavingWithError:contextInfo:), nil); 
} 
[self dismissModalViewControllerAnimated:YES]; 
} 
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{ 
[self dismissModalViewControllerAnimated:YES]; 
} 
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{} 

希望它能幫助！ ;）

Answer 2

看看UIImagePickerController

Answer 3

這裏是一個示例應用程序和一個包裝，它可以讓你像Facebook那樣拍照或從庫中選擇。 https://github.com/fulldecent/FDTake

Answer 4

最簡單的方法是在簡單的alertView中使用UIImagePickerController。

例如，您希望有人點擊自己的個人資料圖片，並能夠從他們的相機或其照片庫中設置新圖像。

@IBAction func btnProfilePicTap(sender: AnyObject) { 
    let picker = UIImagePickerController() 
    picker.delegate = self 
    let alert = UIAlertController(title: nil, message: nil, preferredStyle: .ActionSheet) 
    alert.addAction(UIAlertAction(title: "Camera", style: .Default, handler: { 
     action in 
     picker.sourceType = .Camera 
     self.presentViewController(picker, animated: true, completion: nil) 
    })) 
    alert.addAction(UIAlertAction(title: "Photo Library", style: .Default, handler: { 
     action in 
     picker.sourceType = .PhotoLibrary 
     self.presentViewController(picker, animated: true, completion: nil) 
    })) 
    alert.addAction(UIAlertAction(title: "Cancel", style: .Cancel, handler: nil)) 
    self.presentViewController(alert, animated: true, completion: nil) 
} 

然後只需添加委託，就大功告成了。

extension ProfileViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate { 

    func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) { 
     //use image here! 
     dismissViewControllerAnimated(true, completion: nil) 
    } 

    func imagePickerControllerDidCancel(picker: UIImagePickerController) { 
     dismissViewControllerAnimated(true, completion: nil) 
    } 

} 

對不起，這個例子很快，但我希望它仍然有幫助。

Answer 5

這個答案僅與物理設備相關！

訪問攝像機：

- (void)takePhoto { 

UIImagePickerController *picker = [[UIImagePickerController alloc] init]; 
picker.delegate = self; 
picker.allowsEditing = YES; 
picker.sourceType = UIImagePickerControllerSourceTypeCamera; 

[self presentViewController:picker animated:YES completion:NULL]; 

} 

訪問相機膠捲：

- (void)selectPhoto { 

UIImagePickerController *picker = [[UIImagePickerController alloc] init]; 
picker.delegate = self; 
picker.allowsEditing = YES; 
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; 

[self presentViewController:picker animated:YES completion:NULL]; 


} 

實施的UIImagePickerController的委託方法：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { 

UIImage *chosenImage = info[UIImagePickerControllerEditedImage]; 
self.imageView.image = chosenImage; 

[picker dismissViewControllerAnimated:YES completion:NULL]; 

} 

這：

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker { 

[picker dismissViewControllerAnimated:YES completion:NULL]; 

} 

同時檢查是否存在更多信息這個link

Answer 6

SWIFT 2.0

感謝威廉T.這個工作對我對我的UITapGestureRecognizer

func selectPhoto(tap: UITapGestureRecognizer) { 
    let picker = UIImagePickerController() 
    picker.delegate = self 
    let alert = UIAlertController(title: nil, message: nil, preferredStyle: .ActionSheet) 
    alert.addAction(UIAlertAction(title: "Camera", style: .Default, handler: { 
     action in 
     picker.sourceType = .Camera 
     picker.allowsEditing = true 
     self.presentViewController(picker, animated: true, completion: nil) 
    })) 
    alert.addAction(UIAlertAction(title: "Photo Library", style: .Default, handler: { 
     action in 
     picker.sourceType = .PhotoLibrary 
     picker.allowsEditing = true 
     self.presentViewController(picker, animated: true, completion: nil) 
    })) 
    alert.addAction(UIAlertAction(title: "Cancel", style: .Cancel, handler: nil)) 
    self.presentViewController(alert, animated: true, completion: nil) 
} 

我增加了以下讓我選擇它到兩個.Camera和.PhotoLibrary後編輯照片：

picker.allowsEditing = true 

Answer 7

@WilliamT的回答真的工作對我來說很好。這裏是他的，但更新Swift 4以防萬一任何人仍在尋找這個。

這進入視圖控制器類塊，其中包含您要觸發相機/圖像選擇器的按鈕。

@IBAction func YourButtonToTriggerCamera/ImagePicker(_ sender: UIButton) { 
    let picker = UIImagePickerController() 
    picker.delegate = (self as UIImagePickerControllerDelegate & UINavigationControllerDelegate) 
    let alert = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet) 
    alert.addAction(UIAlertAction(title: "Camera", style: .default, handler: { 
     action in 
     picker.sourceType = .camera 
     self.present(picker, animated: true, completion: nil) 
    })) 
    alert.addAction(UIAlertAction(title: "Photo Library", style: .default, handler: { 
     action in 
     picker.sourceType = .photoLibrary 
     self.present(picker, animated: true, completion: nil) 
    })) 
    alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil)) 
    self.present(alert, animated: true, completion: nil) 
} 

這低於你的視圖控制器類：

extension YourViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate { 

    func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) { 
     //use image here! 
     dismiss(animated: true, completion: nil) 
    } 

    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) { 
     dismiss(animated: true, completion: nil) 
    } 
}