IOS-UIImagePickerController系统拍照

点击按钮添加照片(拍照/相册)普通需求只需调用系统的就可以了

1、创建一个UIImagePickerController 并引入头文件

#import

#import

@property (nonatomic, strong) UIImagePickerController *imagePickerController;

#pragma mark- 懒加载

- (UIImagePickerController *)imagePickerController {

    if (_imagePickerController == nil) {

        _imagePickerController = [[UIImagePickerController alloc] init];

        _imagePickerController.delegate = self; //delegate遵循了代理

        _imagePickerController.allowsEditing = YES;//开启剪切框(默认是NO)

    }

    return _imagePickerController;

}

2、从底部弹出选择框(相册/相机/取消)

- (void)imageViewIsSelector {

    UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];

    UIAlertAction *camera = [UIAlertAction actionWithTitle:@"相机" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

        [self checkCameraPermission];//调用检查相机权限方法

    }];

    UIAlertAction *album = [UIAlertAction actionWithTitle:@"相册" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

        [self checkAlbumPermission];//调起检查相册权限方法

    }];

    UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * action) {

        [self dismissViewControllerAnimated:YES completion:nil];

    }];

    [alert addAction:camera];

    [alert addAction:album];

    [alert addAction:cancel];

    [self presentViewController:alert animated:YES completion:nil];

}


3、选择相册/相机

#pragma mark - Camera(检查相机权限方法)

- (void)checkCameraPermission {

    AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];

    if (status == AVAuthorizationStatusNotDetermined) {

        [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {

            if(granted) {

                [self takePhoto];

            }

        }];

    }else if (status == AVAuthorizationStatusDenied || status == AVAuthorizationStatusRestricted) {

      //如果没有权限给出提示

    }else{

        [self takePhoto];//有权限

    }

}

-(void)takePhoto{

    //判断相机是否可用,如果可用调起

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

        self.imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;

        [self presentViewController:self.imagePickerController animated:YES completion:^{

        }];

    }else{

        NSLog(@"没有相机");

    }

}

//相册流程与相机流程相同,相册是不存在硬件问题的

- (void)checkAlbumPermission {

    PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];

    if (status == PHAuthorizationStatusNotDetermined) {

        [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {

            dispatch_async(dispatch_get_main_queue(), ^{

                if(status ==PHAuthorizationStatusAuthorized) {

                    [self selectAlbum];

                }

            });

        }];

    }else if (status == PHAuthorizationStatusDenied || status == PHAuthorizationStatusRestricted) {

  //如果没有权限给出提示  

    }else{

        [selfselectAlbum];

    }

}

- (void)selectAlbum {

    //判断相册是否可用

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {

        self.imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

        [self presentViewController:self.imagePickerController animated:YES completion:^{

        }];

    }

}


4、选择完成触发代理

//最后一步,选完就把图片加上就完事了

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

    [picker dismissViewControllerAnimated:YES completion:nil];

    UIImage *image = [info valueForKey:@"UIImagePickerControllerOriginalImage"];

    image = [selffixOrientation:image] ;//选择拍照后图片会翻转(调用这个方法翻回来)

//imagePickerController.allowsEditing 设置为YES,剪切后的图片比例是1:1 ,如果需要剪切不同的尺寸,请在懒加载中把allowsEditing设置为NO,并调用下面图片剪切的方法(下面的250是你想要剪切的图片的宽,160是你想要剪切的图片的高,替换掉即可) 

   if(image.size.height>160*image.size.width/250) {

        image = [self imageCutWithOriginalImage:imagewithCutRect:CGRectMake(0, (image.size.height-160*image.size.width/250)*0.5, image.size.width,160*image.size.width/250)];

    }else{

        image = [self imageCutWithOriginalImage:imagewithCutRect:CGRectMake((image.size.width-250*image.size.height/160)*0.5,0,250*image.size.height/160,image.size.height)];

    }

    NSData* pictureData =UIImageJPEGRepresentation(image,1.0);

}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{

    [self.imagePickerController dismissViewControllerAnimated:YES completion:nil] ;

}

//判断图片是否翻转(翻转的话 给转回来..)


- (UIImage*)fixOrientation:(UIImage*)aImage {

    if (aImage.imageOrientation == UIImageOrientationUp)

        return aImage;

    CGAffineTransform transform = CGAffineTransformIdentity;

    switch(aImage.imageOrientation) {

        case UIImageOrientationDown:

        case UIImageOrientationDownMirrored:

            transform =CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height);

            transform =CGAffineTransformRotate(transform,M_PI);

            break;

        case UIImageOrientationLeft:

        case UIImageOrientationLeftMirrored:

            transform =CGAffineTransformTranslate(transform, aImage.size.width,0);

            transform =CGAffineTransformRotate(transform,M_PI_2);

            break;

        case UIImageOrientationRight:

        case UIImageOrientationRightMirrored:

            transform =CGAffineTransformTranslate(transform,0, aImage.size.height);

            transform =CGAffineTransformRotate(transform, -M_PI_2);

            break;

        default:

            break;

    }

    switch(aImage.imageOrientation) {

        case UIImageOrientationUpMirrored:

        case UIImageOrientationDownMirrored:

            transform =CGAffineTransformTranslate(transform, aImage.size.width,0);

            transform =CGAffineTransformScale(transform, -1,1);

            break;

        case UIImageOrientationLeftMirrored:

        case UIImageOrientationRightMirrored:

            transform =CGAffineTransformTranslate(transform, aImage.size.height,0);

            transform =CGAffineTransformScale(transform, -1,1);

            break;

        default:

            break;

    }

    CGContextRef ctx = CGBitmapContextCreate(NULL, aImage.size.width, aImage.size.height,

                                             CGImageGetBitsPerComponent(aImage.CGImage),0,

                                             CGImageGetColorSpace(aImage.CGImage),

                                             CGImageGetBitmapInfo(aImage.CGImage));

    CGContextConcatCTM(ctx, transform);

    switch(aImage.imageOrientation) {

        case UIImageOrientationLeft:

        case UIImageOrientationLeftMirrored:

        case UIImageOrientationRight:

        case UIImageOrientationRightMirrored:

            CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.height,aImage.size.width), aImage.CGImage);

            break;


        default:

            CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.width,aImage.size.height), aImage.CGImage);

            break;

    }

    CGImageRef cgimg = CGBitmapContextCreateImage(ctx);

    UIImage*img = [UIImageimageWithCGImage:cgimg];

    CGContextRelease(ctx);

    CGImageRelease(cgimg);

    returnimg;

}



//图片剪切

- (UIImage *)imageCutWithOriginalImage:(UIImage *)originalImage withCutRect:(CGRect)rect {

    CGImageRefsubImageRef =CGImageCreateWithImageInRect(originalImage.CGImage, rect);

    CGRectsmallRect =CGRectMake(0,0,CGImageGetWidth(subImageRef),CGImageGetHeight(subImageRef));

    UIGraphicsBeginImageContext(smallRect.size);

    CGContextRef context = UIGraphicsGetCurrentContext();

    CGContextDrawImage(context, smallRect, subImageRef);

    UIImage* image = [UIImageimageWithCGImage:subImageRef];

    UIGraphicsEndImageContext();

    CGImageRelease(subImageRef);

    return image;

}


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