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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);
}

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//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];
}

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//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..");
}

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   //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];
}