// 关于图片的选择 //点击要选取图片的view的时候要弹出两个选项,拍照和选取本地- (void)addImageClick{    [_drawlineView removeFromSuperview];    //    [self takePhotoAction];        UIAlertController *actionSheet = [UIAlertController alertControllerWithTitle:@"请选择获取方式" message:nil preferredStyle:UIAlertControllerStyleActionSheet];        [actionSheet addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {                // Cancel button tappped.        [self dismissViewControllerAnimated:YES completion:^{        }];    }]];        [actionSheet addAction:[UIAlertAction actionWithTitle:@"拍照" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {                // 拍摄新照片        [self takePhotoAction];            }]];        [actionSheet addAction:[UIAlertAction actionWithTitle:@"从相册选" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {                // 从相片中读取        [self browseAlbum];            }]];        [self presentViewController:actionSheet animated:YES completion:nil];    }//拍照//最好就是要判断一下相机可不可用, allowsEditing是用来设置照片是否可以编辑,就是会不会出现一个框框来约束图片的比例// sourceType  在拍照时用的 UIImagePickerControllerSourceTypeCamera  在选取图片时用 UIImagePickerControllerSourceTypeSavedPhotosAlbum- (void)takePhotoAction {    BOOL isCamera = [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];    if (!isCamera) { //若不可用，弹出警告框        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"无可用摄像头" message:nil delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];        [alert show];        return;    }    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];    imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;    imagePicker.allowsEditing = YES;    imagePicker.delegate = self;    [self presentViewController:imagePicker animated:YES completion:nil];}//不管拍照还是选取本地图片,完成后都会调用这个方法//info 里面放的图片的所有信息  UIImagePickerControllerOriginalImage这个key拿的是原图   UIImagePickerControllerEditedImage拿的是图片裁剪后的图- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{    NSString *mediaType = info[@"UIImagePickerControllerMediaType"];    if ([mediaType isEqualToString:@"public.image"]) {  //判断是否为图片         UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];//这里拿到图片         //拿到图片,你要做什么事........         {           //do something         }         //通过判断picker的sourceType，如果是拍照则保存到相册去        if (picker.sourceType == UIImagePickerControllerSourceTypeCamera) {            UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);                              }    } }- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error  contextInfo:(void *)contextInfo{    // Was there an error?    if (error != NULL)    {        // Show error message...        [WSToast showToastWithTitle:error.description duration:TOAST_VIEW_TIME completeCallBack:nil];    }    else  // No errors    {        // Show message image successfully saved        [WSToast showToastWithTitle:@"图片已保存" duration:TOAST_VIEW_TIME completeCallBack:nil];    }}