iOS 系统相机和相册权限

1.首先

引入#import 系统类库AVFoundation/AVFoundation.h
签俩个系统代理UIImagePickerControllerDelegate,UINavigationControllerDelegate

2.利用系统弹窗UIActionSheet

 -(void)changeBackground
{
    NSLog(@"更换背景代理");
    UIActionSheet *changeSheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"打开照相机",@"从手机相册获取", nil];
    [changeSheet showInView:self.view];
}
#pragma mark  UIActionSheet  点击按钮触发的方法
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex NS_DEPRECATED_IOS(2_0, 8_3)
{
    //呼出的菜单按钮点击后的响应
    if (buttonIndex == actionSheet.cancelButtonIndex)
    {
        NSLog(@"取消");
    }
    if (buttonIndex == 0) {
        [self takePhoto];
    }
    if (buttonIndex == 1){
        [self LocalPhoto];
    }
}
-(void)takePhoto
{
    //判断相机是否能够使用
    AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeAudio];
     UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;

        UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.allowsEditing = YES;
    picker.sourceType = sourceType;
    if (status == AVAuthorizationStatusAuthorized) {
        /**********   已经授权 可以打开相机   ***********/
        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
        {
            [self presentViewController:_picker animated:YES completion:^{

            }];
        }
        /**********   已经授权 可以打开相机   ***********/
    }else if (status == AVAuthorizationStatusNotDetermined){

        [AVCaptureDevice requestAccessForMediaType:AVMediaTypeAudio completionHandler:^(BOOL granted) {
            if (granted) {
                //第一次用户接受
                [self presentViewController:_picker animated:YES completion:nil];
            }else{
                //用户拒绝

            }
        }];
    }else if (status == AVAuthorizationStatusRestricted){
        UIAlertView *aview = [[UIAlertView alloc] initWithTitle:@"提示" message:@"您的相机权限受限" delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
        [aview show];
    }else if (status == AVAuthorizationStatusDenied){
        UIAlertView *aview= [[UIAlertView alloc] initWithTitle:@"提示" message:@"请在设备的\"设置-隐私-相机\"中允许访问相机。" delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
        [aview show];
    }   
}


 //有的时候打开相机 相机只显示黑色没有图像 定义下方属性解决
 控制台报错  Snapshotting a view that has not been rendered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates

   self.modalPresentationStyle=UIModalPresentationOverCurrentContext;

#pragma mark
#pragma mark  打开本地相册
-(void)LocalPhoto
{
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    picker.delegate = self;
    //设置选择后的图片可被编辑
    picker.allowsEditing = YES;
    [self presentViewController:picker animated:YES completion:^{

    }];
}
#pragma mark
#pragma mark  当选择一张图片进入这里
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(nullable NSDictionary<NSString *,id> *)editingInfo NS_DEPRECATED_IOS(2_0, 3_0)
{
    [picker dismissViewControllerAnimated:YES completion:^{

    }];
    _headview.imgBgView.image = image;

 //将照片存到媒体库
    UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);   
}

#pragma mark - 照片存到本地后的回调
- (void)image:(UIImage*)image didFinishSavingWithError:(NSError*)error contextInfo:(void*)contextInfo{
    if (!error) {
        NSLog(@"存储成功");
    } else {
        NSLog(@"存储失败：%@", error);
    }
}

下面是相册

#pragma mark
#pragma mark  打开本地相册
-(void)LocalPhoto
{
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    picker.delegate = self;
    //设置选择后的图片可被编辑
    picker.allowsEditing = YES;

    //相册的权限
    PHAuthorizationStatus photoAuthorStatus = [PHPhotoLibrary authorizationStatus];
    if (photoAuthorStatus == PHAuthorizationStatusAuthorized) {

        NSLog(@"Authorized");
        [self presentViewController:picker animated:YES completion:nil];

    }else if (photoAuthorStatus == PHAuthorizationStatusDenied){

         NSLog(@"Denied");
        UIAlertView *aview= [[UIAlertView alloc] initWithTitle:@"提示" message:@"请在设备的\"设置-隐私-相册\"中允许访问相册。" delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
        [aview show];

    }else if (photoAuthorStatus == PHAuthorizationStatusNotDetermined){

        [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
            if (status == PHAuthorizationStatusAuthorized) {
                NSLog(@"Authorized");
            }else{
                NSLog(@"Denied or Restricted");
            }
        }];
                NSLog(@"not Determined");

    }else if (photoAuthorStatus == PHAuthorizationStatusRestricted){

        NSLog(@"Restricted");

    }


}

以上是我选择系统相册和相机的使用！希望能对你们有帮助。