ios 启用 UIImagePickerController 上的照片库按钮

Enabling the photo library button on the UIImagePickerController

提问by MBU

Does anyone know how to enable the photo album button on the UIImagePickerController when its in the camera mode? Like how the camera app on on the iphone can toggle between image and video taking and also has the button to view the photo library?

有谁知道如何在相机模式下启用 UIImagePickerController 上的相册按钮？就像 iPhone 上的相机应用程序如何在图像和视频拍摄之间切换，还有查看照片库的按钮？

采纳答案by Kevin Xue

I'm afraid that this can't be done in that easy way (just enable or disable some magic feature). For some simple requirement, you can use cameraOverlayViewand showsCameraControlsto make the implementation.

恐怕这不能以那种简单的方式完成（只需启用或禁用某些神奇功能）。对于一些简单的需求，您可以使用cameraOverlayView和showsCameraControls来实现。

If you want to switch between photo/video mode, i think you can check this demo: http://developer.apple.com/library/ios/#samplecode/AVCam/Introduction/Intro.html

如果你想在照片/视频模式之间切换，我想你可以查看这个演示：http: //developer.apple.com/library/ios/#samplecode/AVCam/Introduction/Intro.html

回答by epsilontik

This can be done via the following lines:

这可以通过以下几行来完成：

- (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;
}

回答by William Entriken

Here is an example app and very simple library that lets you get the Take Photo or Choose from Library just like Facebook does. https://github.com/fulldecent/FDTake

这是一个示例应用程序和非常简单的库，可让您像 Facebook 一样获取“拍照”或“从库中选择”。https://github.com/fulldecent/FDTake

回答by ganime

I have done this tweaking Apple's PhotoPicker example app. I have removed all the camera controls and added my own button. When clicked, UIImagePickerControllerSourceType is set to the UIImagePickerControllerSourceTypePhotoLibrary.

我已经完成了对 Apple 的 PhotoPicker 示例应用程序的调整。我已经删除了所有的相机控件并添加了我自己的按钮。单击时，UIImagePickerControllerSourceType 设置为 UIImagePickerControllerSourceTypePhotoLibrary。

The tricky part for me was "dismissing" (might be technically the wrong word) the Photo Library after the image was picked. I did this by setting the source type back to UIImagePickerControllerSourceTypeCamera. This brings back the camera overlay view.

对我来说棘手的部分是在选择图像后“关闭”（技术上可能是错误的词）照片库。我通过将源类型设置回 UIImagePickerControllerSourceTypeCamera 来做到这一点。这会带回相机叠加视图。

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

回答by ZekeMidas

Swift2 version of @epsilontik code:

@epsilontik 代码的 Swift2 版本：

    //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
}