关于ios:iOS拍照之系统拍照

思路：
零碎拍照应用 UIImagePickerController

1. 设置下 plist，否则没权限，报错

2. 判断摄像头，获取权限，否则弹出界面黑着

3. 设置代理，实现代理

4. 代理办法中获取拍照的图片 / 视频

上菜

plist 中增加 Privacy – Camera Usage Description，文案依据 App 须要来
权限

if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {}

设置 UIImagePickerController

UIImagePickerController *vc = [[UIImagePickerController alloc] init];
// 设置该属性的时候，呈现拍照与拍视频选项
vc.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];
vc.sourceType = UIImagePickerControllerSourceTypeCamera;
vc.delegate = self;
vc.allowsEditing = NO;
// 设置摄像头 [后置摄像头]
vc.cameraDevice = UIImagePickerControllerCameraDeviceRear;
// 设置闪光模式
vc.cameraFlashMode = UIImagePickerControllerCameraFlashModeAuto;
// 设置摄像头模式
vc.cameraCaptureMode = UIImagePickerControllerCameraCaptureModeVideo; // 当该模式设置为 video 的时候，meidaTypes 设置呈现拍照与拍视频选项时，先展现 video 视频拍摄选项
// 录制的最大工夫
vc.videoMaximumDuration = 10;
// 视频品质
vc.videoQuality = UIImagePickerControllerQualityTypeHigh;
vc.modalPresentationStyle = UIModalPresentationFullScreen;
[[[[UIApplication sharedApplication] keyWindow] rootViewController] presentViewController:vc
                                                                                 animated:YES
                                                                               completion:nil];

代理实现

#pragma mark - UINavigationControllerDelegate, UIImagePickerControllerDelegate
- (void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary<UIImagePickerControllerInfoKey,id> *)info {
    // 获取选中资源类型
    NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
    if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) { // 拍照后果
        UIImage *image = nil;
        if (picker.allowsEditing) {image = [info objectForKey:UIImagePickerControllerEditedImage];
        } else {image = [info objectForKey:UIImagePickerControllerOriginalImage];
        }
        [picker dismissViewControllerAnimated:YES completion:nil];
    } else if ([mediaType isEqualToString:(NSString *)kUTTypeMovie]) { // 视频后果
        NSURL *url = [info objectForKey:UIImagePickerControllerMediaURL];
        // 视频寄存到零碎相册
        [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {if (status == PHAuthorizationStatusAuthorized) {[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{[PHAssetChangeRequest creationRequestForAssetFromVideoAtFileURL:url];
                       } completionHandler:^(BOOL success, NSError * error) {if (success) {NSLog(@"保留视频到相册");
                           } else {NSLog(@"保留视频到相册失败：%@", error);
                           }
                       }];
            } else {NSLog(@"无拜访相册权限");
            }
            dispatch_async(dispatch_get_main_queue(), ^{[picker dismissViewControllerAnimated:YES completion:nil];
            });
        }];
    }
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {[picker dismissViewControllerAnimated:YES completion:nil];
}

结语：
UIImagePickerController 使用方便，可拍照、视频。实用于拍照界面无定制、简略取图这类需要

拍照在 App 中应用频次高，入门级别间接调用零碎拍照