调用系统相机及相册功能

前言

在iOS中要拍照和录制视频最简单的方式就是调用UIImagePickerController，UIImagePickerController继承与UINavigationController，需要使用代理方法时需要同时遵守这两个协议

下面我们做代码前的准备

版本宏

#define iOS7Later ([UIDevice currentDevice].systemVersion.floatValue >= 7.0f)
#define iOS8Later ([UIDevice currentDevice].systemVersion.floatValue >= 8.0f)
#define iOS9Later ([UIDevice currentDevice].systemVersion.floatValue >= 9.0f)
#define iOS9_1Later ([UIDevice currentDevice].systemVersion.floatValue >= 9.1f)

你需要对info.plist进行配置

这个是info.plist截图

Privacy - Photo Library Usage Description   ---  打开相册可以吗？
Privacy - Camera Usage Description   --- 
Privacy - Location Always Usage Description   ----
Privacy - Location When In Use Usage Description   ---
实现上面部分之后，开始显示代码部分

代码部分

@property(nonatomic, strong)UIImagePickerController *imagePickerController;//初始化imagePickerController

点击事件实现相机调用私有方法

- (IBAction)photoBtnClick:(UIButton *)sender {
    [self selectImageFromAlbum];
}

调用本地相册

- (void)selectImageFromAlbum
{
    //NSLog(@"相册");
    _imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    
    [self presentViewController:_imagePickerController animated:YES completion:nil];
}

#pragma mark UIImagePickerControllerDelegate
//该代理方法仅适用于只选取图片时
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(nullable NSDictionary *)editingInfo {
    NSLog(@"选择完毕----image:%@-----info:%@",image,editingInfo);
}

//适用获取所有媒体资源，只需判断资源类型
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
    NSString *mediaType=[info objectForKey:UIImagePickerControllerMediaType];
    //判断资源类型
    if ([mediaType isEqualToString:(NSString *)kUTTypeImage]){
//        //如果是图片
        self.imageView.image = info[UIImagePickerControllerEditedImage];
        //压缩图片
        NSData *fileData = UIImageJPEGRepresentation(self.imageView.image, 1.0);
        //保存图片至相册
        UIImageWriteToSavedPhotosAlbum(self.imageView.image, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);
        //上传图片
//        [self uploadImageWithData:fileData];
        
    }
    [self dismissViewControllerAnimated:YES completion:nil];
}

#pragma mark 图片保存完毕的回调
- (void) image: (UIImage *) image didFinishSavingWithError:(NSError *) error contextInfo: (void *)contextInf{
    
}

#pragma mark 视频保存完毕的回调
- (void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInf{
    if (error) {
        NSLog(@"保存视频过程中发生错误，错误信息:%@",error.localizedDescription);
    }else{
        NSLog(@"视频保存成功.");
    }
}

下面实现照相机拍照代码

#pragma mark 照相机拍照
-(void)photoByCamera
{
    AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
    if ((authStatus == AVAuthorizationStatusRestricted || authStatus ==AVAuthorizationStatusDenied) && iOS7Later) {
        
    } else { // 调用相机
        UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;
        if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera]) {
            
            /*隐藏tabar*/
            
            self.viewController.tabBarController.tabBar.hidden = YES;
            self.imagePickerController.sourceType = sourceType;
            if(iOS8Later) {
                self.imagePickerController.modalPresentationStyle = UIModalPresentationOverCurrentContext;
            }
            [self.viewController presentViewController:self.imagePickerController animated:YES completion:nil];
        } else {
            NSLog(@"模拟器中无法打开照相机,请在真机中使用");
        }
    }
}

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