iOS选取图片与拍照保存图片

//遵守协议,第一个必需遵守,第二个我不确定
<UIImagePickerControllerDelegate,UINavigationControllerDelegate>
- (void)funcChooseFromPhotoAlbum {
    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
    //设置代理
    imagePicker.delegate = self;
    //允许编辑
    imagePicker.allowsEditing = true;
    //设置图片源
    [imagePicker setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
    //模态弹出IamgePickerView
    [self presentViewController:imagePicker animated:YES completion:nil];
}
- (void)funcChooseFromCamera {
    //    UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        isUseCamera = YES;
        UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
        //设置代理
        imagePicker.delegate = self;
        //允许编辑
        imagePicker.allowsEditing = true;
        //设置图片源
        [imagePicker setSourceType:UIImagePickerControllerSourceTypeCamera];
        //模态弹出IamgePickerView
        [self presentViewController:imagePicker animated:YES completion:nil];
    }else {
        NSLog(@"模拟器不支持拍照功能");
        
    }
    
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info {
    
    UIImage* outputImage = [info objectForKey:UIImagePickerControllerEditedImage];
    if (outputImage == nil) {
        outputImage = [info objectForKey:UIImagePickerControllerOriginalImage];
    }
    NSData *headData = UIImagePNGRepresentation(outputImage);
    NSString *documents = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
    //拼接文件绝对路径
    NSString *path = [documents stringByAppendingPathComponent:@"header.png"];
    
    //保存
    [headData writeToFile:path atomically:YES];
    headView.headImage.image = outputImage;
    
    // UIImageWriteToSavedPhotosAlbum 这个方法,默认保存到系统相机胶卷,但是@selector后面的方法 必须是这种格式:  - (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo;
    //保存图片到系统相册
    if (isUseCamera) {
        isUseCamera = NO;
        outputImage = [info objectForKey:UIImagePickerControllerOriginalImage];
        UIImageWriteToSavedPhotosAlbum(outputImage, self, nil, nil);
    }
    
    [picker dismissViewControllerAnimated:YES completion:nil];
}
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {

    if (error) {

        NSLog(@"保存失败");
    }
    else  {
        NSLog(@"保存成功");
    }
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
    [self dismissViewControllerAnimated:YES completion:nil];
    
}