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  • UIImagePickerController 获取相片视频

    1.UIImagePickerController的静态方法:

        imagepicker = [[UIImagePickerController alloc]init];
        //UIImagePickerController静态方法判断设备是否支持照相机/图片库/相册功能
        /*
         typedef NS_ENUM(NSInteger, UIImagePickerControllerSourceType) {
         UIImagePickerControllerSourceTypePhotoLibrary,
         UIImagePickerControllerSourceTypeCamera,
         UIImagePickerControllerSourceTypeSavedPhotosAlbum
         };
         */
        BOOL isCameraSupport = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];
        NSLog(@"support camera:%d",isCameraSupport);
        
        //UIImagePickerController静态方法判断设备是否支持前置摄像头/后置摄像头
        /*
         typedef NS_ENUM(NSInteger, UIImagePickerControllerCameraDevice) {
         UIImagePickerControllerCameraDeviceRear,
         UIImagePickerControllerCameraDeviceFront
         };
         */
        BOOL isRearSupport = [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];
        NSLog(@"rear support:%d",isRearSupport);
        
        //UIImagePickerController静态方法判断设备是否支持前置摄像头闪光灯/后置摄像头闪光灯
        /*
         typedef NS_ENUM(NSInteger, UIImagePickerControllerCameraDevice) {
         UIImagePickerControllerCameraDeviceRear,
         UIImagePickerControllerCameraDeviceFront
         };
         */
        BOOL isFlushSupport = [UIImagePickerController isFlashAvailableForCameraDevice:UIImagePickerControllerCameraDeviceRear];
        NSLog(@"rear flash support:%d",isFlushSupport);
        
        //UIImagePickerController静态方法返回前置摄像头/后置摄像头支持的拍摄类型
        /*
         typedef NS_ENUM(NSInteger, UIImagePickerControllerCameraDevice) {
         UIImagePickerControllerCameraDeviceRear,
         UIImagePickerControllerCameraDeviceFront
         };
         */
        //返回类型有照片和视频
        /*
         enum {
         UIImagePickerControllerCameraCaptureModePhoto,
         UIImagePickerControllerCameraCaptureModeVideo
         };
         typedef NSUInteger UIImagePickerControllerCameraCaptureMode;
         */
        NSArray* captureModes = [UIImagePickerController availableCaptureModesForCameraDevice:UIImagePickerControllerCameraDeviceRear];
        for (NSNumber* mode in captureModes) {
            NSLog(@"capture modes:%d",[mode integerValue]);
        }
        
        //UIImagePickerController静态方法返回照相机/相册/照片库所支持的媒体类型
        /*
         typedef NS_ENUM(NSInteger, UIImagePickerControllerSourceType) {
         UIImagePickerControllerSourceTypePhotoLibrary,
         UIImagePickerControllerSourceTypeCamera,
         UIImagePickerControllerSourceTypeSavedPhotosAlbum
         };
         */
        //返回类型有kUTTypeMovie,kUTTypeImage,其他类型均在<MobileCoreServices/MobileCoreServices.h>下
        NSArray* mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];
        for (NSString* type in mediaTypes) {
            NSLog(@"media types:%@",type);
        }

    2.UIImagePickerController属性详解:

        //指定使用照相机模式,可以指定使用相册/照片库
        imagepicker.sourceType = UIImagePickerControllerSourceTypeCamera;
        //设置当拍照完或在相册选完照片后,是否跳到编辑模式进行图片剪裁。只有当showsCameraControls属性为true时才有效果
        imagepicker.allowsEditing = YES;
        //设置拍照时的下方的工具栏是否显示,如果需要自定义拍摄界面,则可把该工具栏隐藏
        imagepicker.showsCameraControls  = YES;
        //设置使用后置摄像头,可以使用前置摄像头
        imagepicker.cameraDevice = UIImagePickerControllerCameraDeviceRear;
        //设置闪光灯模式
        /*
         typedef NS_ENUM(NSInteger, UIImagePickerControllerCameraFlashMode) {
         UIImagePickerControllerCameraFlashModeOff  = -1,
         UIImagePickerControllerCameraFlashModeAuto = 0,
         UIImagePickerControllerCameraFlashModeOn   = 1
         };
         */
        imagepicker.cameraFlashMode = UIImagePickerControllerCameraFlashModeAuto;
        //设置相机支持的类型,拍照和录像
        imagepicker.mediaTypes = @[(NSString*)kUTTypeImage,(NSString*)kUTTypeMovie];
        //设置拍摄时屏幕的view的transform属性,可以实现旋转,缩放功能
       // imagepicker.cameraViewTransform = CGAffineTransformMakeRotation(M_PI*45/180);
       // imagepicker.cameraViewTransform = CGAffineTransformMakeScale(1.5, 1.5);
        //所有含有cameraXXX的属性都必须要sourceType是UIImagePickerControllerSourceTypeCamera时设置才有效果,否则会有异常
        //设置UIImagePickerController的代理
        imagepicker.delegate = self;

    -(void)showCamera{
        //用模态方式呈现imagepicker
        [self presentModalViewController:imagepicker animated:YES];
    }

    使用 imagepicker.cameraViewTransform = CGAffineTransformMakeRotation(M_PI*45/180);旋转45度的效果:

    使用imagepicker.cameraViewTransform = CGAffineTransformMakeScale(1.5, 1.5);全屏的效果,同时imagepicker.showsCameraControls  =NO;隐藏工具栏:

    使用imagepicker.allowsEditing = YES;出现的图片编辑效果,只有imagepicker.showsCameraControls  = YES;才有效果:

    使用 imagepicker.mediaTypes = @[(NSString*)kUTTypeImage,(NSString*)kUTTypeMovie];支持拍照和视频的前后对比效果:

    3.UIImagePickerController回调详解:

    //成功获得相片还是视频后的回调
    - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
        //通过UIImagePickerControllerMediaType判断返回的是照片还是视频
        NSString* type = [info objectForKey:UIImagePickerControllerMediaType];
        //如果返回的type等于kUTTypeImage,代表返回的是照片,并且需要判断当前相机使用的sourcetype是拍照还是相册
        if ([type isEqualToString:(NSString*)kUTTypeImage]&&picker.sourceType==UIImagePickerControllerSourceTypeCamera) {
            //获取照片的原图
            UIImage* original = [info objectForKey:UIImagePickerControllerOriginalImage];
            //获取图片裁剪的图
            UIImage* edit = [info objectForKey:UIImagePickerControllerEditedImage];
            //获取图片裁剪后,剩下的图
            UIImage* crop = [info objectForKey:UIImagePickerControllerCropRect];
            //获取图片的url
            NSURL* url = [info objectForKey:UIImagePickerControllerMediaURL];
            //获取图片的metadata数据信息
            NSDictionary* metadata = [info objectForKey:UIImagePickerControllerMediaMetadata];
            //如果是拍照的照片,则需要手动保存到本地,系统不会自动保存拍照成功后的照片
            UIImageWriteToSavedPhotosAlbum(edit, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
        }else{
        
        }
        //模态方式退出uiimagepickercontroller
        [imagepicker dismissModalViewControllerAnimated:YES];
    }
    //取消照相机的回调
    - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
        //模态方式退出uiimagepickercontroller
        [imagepicker dismissModalViewControllerAnimated:YES];
    }
    //保存照片成功后的回调
    - (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error
      contextInfo:(void *)contextInfo{
        
        NSLog(@"saved..");
    }

    4.自定义相机拍照画面:

       //设置拍照时的下方的工具栏是否显示,如果需要自定义拍摄界面,则可把该工具栏隐藏
        imagepicker.showsCameraControls  = NO;

        UIToolbar* tool = [[UIToolbar alloc]initWithFrame:CGRectMake(0, self.view.frame.size.height-55, self.view.frame.size.width, 75)];
        tool.barStyle = UIBarStyleBlackTranslucent;
        UIBarButtonItem* cancel = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(cancelCamera)];
        UIBarButtonItem* add = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(savePhoto)];
        [tool setItems:[NSArray arrayWithObjects:cancel,add, nil]];
       //把自定义的view设置到imagepickercontroller的overlay属性中

       imagepicker.cameraOverlayView = tool;

    -(void)cancelCamera{
        [imagepicker dismissModalViewControllerAnimated:YES];
    }
    -(void)savePhoto{
        //拍照,会自动回调- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info,对于自定义照相机界面,拍照后回调可以不退出实现连续拍照效果
        [imagepicker takePicture];
    }

    5.UIImagePickerController是继承UINavigationController,所以可以push和pop一些viewcontroller进行导航效果。例如,自定义照相机画面的时候可以在拍摄完后push一个viewcontroller用于对照片进行编辑。

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  • 原文地址:https://www.cnblogs.com/yeng/p/5907925.html
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