UIImagePickerView的应用 （李梦珂）

一、加载网络图片 

//----------------------网络加载图像-------------------------

    

    NSString *urlstring =@"http://down.tutu001.com/d/file/20101129/2f5ca0f1c9b6d02ea87df74fcc_560.jpg";

    NSURL *url = [NSURLURLWithString:urlstring];

    NSData *Data = [NSDatadataWithContentsOfURL:url];

    NSLog(@"%d",Data.length);

       //data 转 image

    UIImage *image = [UIImageimageWithData:Data];

    imageview.image = image;

    

    //image 转 data

    NSData *imagedata = UIImageJPEGRepresentation(image, 1);

    NSLog(@"%d",imagedata.length);

    

    //将图片保存到相册中

    UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:),NULL);

二、访问相册

//    UIImagePickerControllerSourceTypePhotoLibrary OR       UIImagePickerControllerSourceTypeSavedPhotosAlbum访问相册资源

    UIImagePickerController *pickervc = [[UIImagePickerControlleralloc]init];

    pickervc.sourceType =UIImagePickerControllerSourceTypePhotoLibrary;

    pickervc.delegate = self;

  

三、访问摄像头

    //UIImagePickerControllerSourceTypeCamera 访问摄像头

  UIImagePickerController *pickervc = [[UIImagePickerControlleralloc]init];

        pickervc.sourceType =UIImagePickerControllerSourceTypeCamera;

//判断能否调用摄像头

[UIImagePickerControllerisCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear]

注：

UIImagePickerControllerCameraDeviceRear后置摄像头

UIImagePickerControllerCameraDeviceFront 前置摄像头