UIImagePicketView（照相机类）的使用

本文主要是介绍UIImagePicketView（照相机类）的使用，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1.挂代理

UIImagePickerControllerDelegate,UINavigationControllerDelegate

2. 看代码

UIImagePickerController *imagepicker=[[UIImagePickerController alloc]init];

imagepicker.delegate=self;

// 指定类型：相机

imagepicker.sourceType=UIImagePickerControllerSourceTypeCamera;

// 拍照完成后是否进入编辑模式

imagepicker.allowsEditing=YES;

// 在拍照中是否隐藏编辑按钮（隐藏一般用于自定义摄像机的时候为no）

imagepicker.showsCameraControls = YES;

// 可以指定前或者后摄像头

imagepicker.cameraDevice = UIImagePickerControllerCameraDeviceRear;

/// 指定摄像头的闪光灯的模式

imagepicker.cameraFlashMode = UIImagePickerControllerCameraFlashModeOn;

// 定义是否既可以录像换可以拍照片

imagepicker.mediaTypes=[NSArray arrayWithObjects:@"public.movie", @"public.image", nil];

// 使拍照的View旋转 45度

// imagepicker.cameraViewTransform = CGAffineTransformMakeRotation(M_PI*45/180);

// 定义拍照View的缩放比例

// imagepicker.cameraViewTransform=CGAffineTransformMakeScale(1, 2);

[self presentViewController:imagepicker animated:YES completion:^{

}];

浓缩版

UIImagePickerController *imagepicker=[[UIImagePickerController alloc]init];

imagepicker.delegate=self;

// 指定类型：相机

imagepicker.sourceType=UIImagePickerControllerSourceTypeCamera;

[self presentViewController:imagepicker animated:YES completion:^{

}];

3. 实现代理方法

//成功获得相片还是视频后的回调
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{

//获取图片裁剪的图
UIImage* edit = [info objectForKey:UIImagePickerControllerEditedImage];

  //如果是拍照的照片，则需要手动保存到本地（会保存到系统的PhotosAlbum），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{

    }

}

// 上一步保存照片成功后的会回调函数
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error
contextInfo:(void *)contextInfo{

NSLog(@"saved..");
}

//取消按键照相机的回调
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
//模态方式退出uiimagepickercontroller
[imagepicker dismissModalViewControllerAnimated:YES];
}

4.改中文

1.Project-->Info-->Localizations添加Chinese

二。详解

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，只有当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..");
}