iOS 调用拍照、选择本地相册、上传功能－－－未完善。

1.新建viewController 拖入一个Button,添加点击事件，使用代理方法

<UIActionSheetDelegate,UIImagePickerControllerDelegate>

2.代码如下- (IBAction)DoChoose:(id)sender {

    UIActionSheet *sheet;
    //检查是否有摄像头功能
    if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        
        sheet = [[UIActionSheet alloc]
                 initWithTitle:@"选择"
                 delegate:self
                 cancelButtonTitle:nil
                 destructiveButtonTitle:@"取消"
                 otherButtonTitles:@"拍照",@"从相册选择", nil];
    }
    else
    {
        sheet = [[UIActionSheet alloc]
                 initWithTitle:@"选择"
                 delegate:self
                 cancelButtonTitle:nil
                 destructiveButtonTitle:@"取消"
                 otherButtonTitles:@"从相册选择", nil];
    }
    sheet.tag=255;
    [sheet showInView:self.view];
}

//代理方法，启用拍照或使用相册功能
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if (actionSheet.tag == 255) {
        NSUInteger sourceType = 0;
        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
            switch (buttonIndex) {
                case 0:
                    return;
                case 1:
                    sourceType = UIImagePickerControllerSourceTypeCamera;
                    break;
                case 2:
                    sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
                    break;
                default:
                    break;
            }
        }
        else
        {
            if (buttonIndex ==0) {
                return;
            }
            else
            {
                sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
            }
        }
        
        UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
        
        imagePickerController.delegate = self;
        
        imagePickerController.allowsEditing = YES;
        
        imagePickerController.sourceType = sourceType;
        
        [self presentViewController:imagePickerController animated:YES completion:^{}];
    }
}

//返回的图片数据
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
{
    //返回到主界面中
    [picker dismissViewControllerAnimated:YES completion:^{}];
    
    //获取返回的图片
    UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];

    //压缩图片
    NSData *imageData = UIImageJPEGRepresentation(image, 0.5);
    
    //沙盒，准备保存的图片地址和图片名称
    NSString *fullPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"x.jpg"];

    //将图片写入文件中
    [imageData writeToFile:fullPath atomically:NO];
    
    //通过路径获取到保存的图片，可以在主界面上的image进行预览
    UIImage *saveImage = [[UIImage alloc]initWithContentsOfFile:fullPath];
    
    [self.img1 setImage:saveImage];

    //将图片变为Base64格式，可以将数据通过接口传给后台
    NSData *data = UIImageJPEGRepresentation(saveImage, 1.0f);

    NSString *baseString = [data base64Encoding];
}

//关闭拍照窗口
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [self dismissViewControllerAnimated:YES completion:^{}];
}