如何从照片库中选择图像并在应用程序中显示系统摄像头界面？
如何让用户从Apple照片库中选择照片？ 我们如何显示系统相机UI以允许用户拍照？
编辑：2016年3月15日 – 这是我之前的答案的快速版本，如果您正在寻找Objective-c版本，您将在下面找到它。
– SWIFT –
首先符合UIImagePickerControllerDelegate协议和UINavigationControllerDelegate协议
class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate 启动图像选择器
func actionLaunchCamera() { if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera) { let imagePicker:UIImagePickerController = UIImagePickerController() imagePicker.delegate = self imagePicker.sourceType = UIImagePickerControllerSourceType.Camera imagePicker.allowsEditing = true self.presentViewController(imagePicker, animated: true, completion: nil) } else { let alert:UIAlertController = UIAlertController(title: "Camera Unavailable", message: "Unable to find a camera on this device", preferredStyle: UIAlertControllerStyle.Alert) self.presentViewController(alert, animated: true, completion: nil) } }
实现UIImagePickerDelegate协议的委托方法
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) { // create a filepath with the current date/time as the image name let savePath:String = self.documentsPath()! + "/" + self.presentDateTimeString() + ".png" // try to get our edited image if there is one, as well as the original image let editedImg:UIImage? = info[UIImagePickerControllerEditedImage] as? UIImage let originalImg:UIImage? = info[UIImagePickerControllerOriginalImage] as? UIImage // create our image data with the edited img if we have one, else use the original image let imgData:NSData = editedImg == nil ? UIImagePNGRepresentation(editedImg!)! : UIImagePNGRepresentation(originalImg!)! // write the image data to file imgData.writeToFile(savePath, atomically: true) // dismiss the picker self.dismissViewControllerAnimated(true, completion: nil) } func imagePickerControllerDidCancel(picker: UIImagePickerController) { // picker cancelled, dismiss picker view controller self.dismissViewControllerAnimated(true, completion: nil) } // added these methods simply for convenience/completeness func documentsPath() ->String? { // fetch our paths let paths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true) if paths.count > 0 { // return our docs directory path if we have one let docsDir = paths[0] return docsDir } return nil } func presentDateTimeString() ->String { // setup date formatter let dateFormatter:NSDateFormatter = NSDateFormatter() dateFormatter.dateFormat = "dd-MM-yyyy HH:mm:ss" // get current date let now:NSDate = NSDate() // generate date string from now let theDateTime = dateFormatter.stringFromDate(now) return theDateTime }
– 目标-C –
编辑：更新以在尝试启动相机之前检查相机是否可用。 还添加了代码，显示如何将png照片保存到应用程序沙箱中的文档文件夹。
尝试一下（假设使用ARC）。
在.h文件中符合委托协议：
@interface MyViewController : UIViewController
在.m文件中启动图像选择器（摄像头）：
-(void)actionLaunchAppCamera { if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { UIImagePickerController *imagePicker = [[UIImagePickerController alloc]init]; imagePicker.delegate = self; imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera; imagePicker.allowsEditing = YES; [self presentModalViewController:imagePicker animated:YES]; }else{ UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Camera Unavailable" message:@"Unable to find a camera on your device." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; [alert show]; alert = nil; } }
然后实现委托协议来处理用户取消事件或保存/编辑/等照片。
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { //This creates a filepath with the current date/time as the name to save the image NSString *presentTimeStamp = [Utilities getPresentDateTime]; NSString *fileSavePath = [Utilities documentsPath:presentTimeStamp]; fileSavePath = [fileSavePath stringByAppendingString:@".png"]; //This checks to see if the image was edited, if it was it saves the edited version as a .png if ([info objectForKey:UIImagePickerControllerEditedImage]) { //save the edited image NSData *imgPngData = UIImagePNGRepresentation([info objectForKey:UIImagePickerControllerEditedImage]); [imgPngData writeToFile:fileSavePath atomically:YES]; }else{ //save the original image NSData *imgPngData = UIImagePNGRepresentation([info objectForKey:UIImagePickerControllerOriginalImage]); [imgPngData writeToFile:fileSavePath atomically:YES]; } [self dismissModalViewControllerAnimated:YES]; } -(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker { [self dismissModalViewControllerAnimated:YES]; }
还添加了编辑：以下是用于获取文档路径和当前日期/时间的Utilities类的方法
+(NSString *)documentsPath:(NSString *)fileName { NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; return [documentsDirectory stringByAppendingPathComponent:fileName]; } +(NSString *)getPresentDateTime{ NSDateFormatter *dateTimeFormat = [[NSDateFormatter alloc] init]; [dateTimeFormat setDateFormat:@"dd-MM-yyyy HH:mm:ss"]; NSDate *now = [[NSDate alloc] init]; NSString *theDateTime = [dateTimeFormat stringFromDate:now]; dateTimeFormat = nil; now = nil; return theDateTime; }
您需要使用UIImagePickerController 。
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
您必须使用NSFileManager方法实现UIImagePickerControllerDelegate方法imagePickerController:didFinishPickingMediaWithInfo:然后使用您想要的任何文件名将UIImage存储到您想要的任何位置。
第1步：确认UIImagePickerControllerDelegate，UINavigationControllerDelegate
第2步：（iOS 10+）将此项添加为info.plist文件的密钥。密钥：隐私 – 相机使用说明
值：#Your message
第3步：在你的@IBAction中
if UIImagePickerController.isSourceTypeAvailable(.camera) { var imagePicker = UIImagePickerController() imagePicker.delegate = self imagePicker.sourceType = .camera imagePicker.allowsEditing = false self.present(imagePicker, animated: true, completion: nil) }
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
此代码将触发设备相机..
//对于Open Gallery
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init]; imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; imagePickerController.delegate = self; if([[[UIDevice currentDevice] systemVersion] floatValue]>=8.0) { [[NSOperationQueue mainQueue] addOperationWithBlock:^{ [self presentViewController:imagePickerController animated:YES completion:nil]; }]; } else{ [self presentViewController:imagePickerController animated:YES completion:nil]; }
//对于开放式相机
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init]; imagePickerController.modalPresentationStyle = UIModalPresentationFullScreen; imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera; imagePickerController.delegate = self; if([[[UIDevice currentDevice] systemVersion] floatValue]>=8.0) { [[NSOperationQueue mainQueue] addOperationWithBlock:^{ [self presentViewController:imagePickerController animated:YES completion:nil]; }]; } else{ [self presentViewController:imagePickerController animated:YES completion:nil]; } }
这是digitalHound的答案的更新版本，适用于Swift 3。
动作启动相机function：
func actionLaunchCamera() { if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.camera) { let imagePicker:UIImagePickerController = UIImagePickerController() imagePicker.delegate = self imagePicker.sourceType = UIImagePickerControllerSourceType.camera imagePicker.allowsEditing = true self.present(imagePicker, animated: true, completion: nil) } else { let alert:UIAlertController = UIAlertController(title: "Camera Unavailable", message: "Unable to find a camera on this device", preferredStyle: UIAlertControllerStyle.alert) alert.addAction(UIAlertAction(title: "Dismiss", style: .default, handler: nil)) alert.view.tintColor = UIColor(red:0.37, green:0.66, blue:0.44, alpha:1.0) self.present(alert, animated: true, completion: nil) } }
代表职能：
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) { // create a filepath with the current date/time as the image name let savePath:URL = URL(fileURLWithPath: self.documentsPath()! + "/" + self.presentDateTimeString() + ".png") // try to get our edited image if there is one, as well as the original image let editedImg:UIImage? = info[UIImagePickerControllerEditedImage] as? UIImage let originalImg:UIImage? = info[UIImagePickerControllerOriginalImage] as? UIImage // create our image data with the edited img if we have one, else use the original image let imgData:Data = editedImg == nil ? UIImagePNGRepresentation(editedImg!)! : UIImagePNGRepresentation(originalImg!)! as Data // write the image data to file try! imgData.write(to: savePath, options: []) // dismiss the picker self.dismiss(animated: true, completion: nil) } func imagePickerControllerDidCancel(_ picker: UIImagePickerController) { // picker cancelled, dismiss picker view controller self.dismiss(animated: true, completion: nil) } // added these methods simply for convenience/completeness func documentsPath() ->String? { // fetch our paths let paths = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true) if paths.count > 0 { // return our docs directory path if we have one let docsDir = paths[0] return docsDir } return nil } func presentDateTimeString() ->String { // setup date formatter let dateFormatter:DateFormatter = DateFormatter() dateFormatter.dateFormat = "dd-MM-yyyy HH:mm:ss" // get current date let now:Date = Date() // generate date string from now let theDateTime = dateFormatter.string(from: now) return theDateTime }
这对我有用。