启用UIImagePickerController上的照片库按钮

Question

有谁知道如何启用相机模式下的UIImagePickerController上的相册按钮？就像iPhone上的相机应用程序可以在图像和视频拍摄之间切换，并且还具有查看照片库的按钮？

Answer 1

恐怕不能以这种简单的方式完成（只是启用或禁用某些魔术功能）。对于一些简单的要求，您可以使用cameraOverlayView和showsCameraControls来实现。

如果要照片/视频模式之间进行切换，我想你可以检查此演示：http://developer.apple.com/library/ios/#samplecode/AVCam/Introduction/Intro.html

Answer 2

这可以通过以下行来完成：

- (void) navigationController: (UINavigationController *) navigationController willShowViewController: (UIViewController *) viewController animated: (BOOL) animated { 
    if (imagePickerController.sourceType == UIImagePickerControllerSourceTypePhotoLibrary) { 
     UIBarButtonItem* button = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:self action:@selector(showCamera:)]; 
     viewController.navigationItem.rightBarButtonItems = [NSArray arrayWithObject:button]; 
    } else { 
     UIBarButtonItem* button = [[UIBarButtonItem alloc] initWithTitle:@"Library" style:UIBarButtonItemStylePlain target:self action:@selector(showLibrary:)]; 
     viewController.navigationItem.leftBarButtonItems = [NSArray arrayWithObject:button]; 
     viewController.navigationItem.title = @"Take Photo"; 
     viewController.navigationController.navigationBarHidden = NO; // important 
    } 
} 

- (void) showCamera: (id) sender { 
    imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera; 
} 

- (void) showLibrary: (id) sender { 
    imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; 
} 

Answer 3

下面是一个示例应用程序和非常简单的图书馆，可以让你像Facebook那样获取拍照或从图书馆中选择。 https://github.com/fulldecent/FDTake

Answer 4

我已经做了这个调整苹果的PhotoPicker示例应用程序。我已经删除了所有的相机控制，并添加了我自己的按钮。点击后，UIImagePickerControllerSourceType被设置为UIImagePickerControllerSourceTypePhotoLibrary。

对于我来说，棘手的部分是在图像被选中后“解散”（可能在技术上是错误的词）照片库。我通过将源类型设置回UIImagePickerControllerSourceTypeCamera来做到这一点。这将带回相机重叠视图。

ViewController.h 

#import <UIKit/UIKit.h> 
#import <CoreGraphics/CoreGraphics.h> 
#import <ImageIO/ImageIO.h> 


@interface ViewController : UIViewController <UIImagePickerControllerDelegate> { 

// 

} 

@property (nonatomic, strong) UIImagePickerController *imagePicker; 
- (IBAction)uploadNewPhotoTapped:(id)sender; 
@end 


ViewController.m 

#import "ViewController.h" 

@interface ViewController() 

@end 

@implementation ViewController 

//Other code 

- (IBAction)uploadNewPhotoTapped:(id)sender { 

    UIImagePickerController *imagePickController=[[UIImagePickerController alloc]init]; 
    //You can use isSourceTypeAvailable to check 

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) 
    { 
     imagePickController.sourceType=UIImagePickerControllerSourceTypeCamera; 
     imagePickController.showsCameraControls=YES; 
     // self.usingPopover = NO; 
    } 
    else if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {//Check PhotoLibrary available or not 
     imagePickController.sourceType=UIImagePickerControllerSourceTypePhotoLibrary; 
     imagePickController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; 
    } 
    else if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum]) //Check front Camera available or not 
     imagePickController.sourceType=UIImagePickerControllerSourceTypeSavedPhotosAlbum; 
    //else //!!!!!!!!!!!exception 

    imagePickController.delegate=self; 
    imagePickController.allowsEditing=NO; 

    [self presentModalViewController:imagePickController animated:YES]; 
} 


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

    UIImage *originalImage=[info objectForKey:UIImagePickerControllerOriginalImage]; 

    //Do whatever with your image 
    NSData *data = UIImageJPEGRepresentation (
              originalImage, 
              1.0 
             ); 

    [self dismissModalViewControllerAnimated:YES]; 
} 

    // Other code 
    @end 

Answer 5

Swift2版本的@epsilontik代码：

//mediaPicker is your UIImagePickerController 
func navigationController(navigationController: UINavigationController, willShowViewController viewController: UIViewController, animated: Bool) { 
    if(mediaPicker.sourceType == UIImagePickerControllerSourceType.PhotoLibrary){ 
     let button = UIBarButtonItem(title: "Take picture", style: UIBarButtonItemStyle.Plain, target: self, action: "showCamera") 
     viewController.navigationItem.rightBarButtonItem = button 
    }else{ 
     let button = UIBarButtonItem(title: "Choose picture", style: UIBarButtonItemStyle.Plain, target: self, action: "choosePicture") 
     viewController.navigationItem.rightBarButtonItem = button 
     viewController.navigationController?.navigationBarHidden = false 
     viewController.navigationController?.navigationBar.translucent = true 
    } 
} 

func showCamera(){ 
    mediaPicker.sourceType = UIImagePickerControllerSourceType.Camera 
} 

func choosePicture(){ 
    mediaPicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary 
}