生成文档缩略图 [英] Generate document thumbnails

问题描述

我正在尝试显示文档网格（保存在文档目录中）但我不知道如何生成文档的缩略图。文档可以是 QLPreviewController 可以显示的任何内容。 PDF和图像很好，但其他的东西，如.doc我不知道。任何指导都会有所帮助。

解决方案

由于你有一个可以显示任何这些文件的UIView，你只需要一个快捷方式： / p>

- 用显示的文档创建预览控制器的实例

- 不要将此视图/控制器添加到任何内容

从图层创建图片

这可能有所帮助：

  +（UIImage *）imageFromView：（UIView *）view {
 CALayer * layer = view.layer; 
 UIGraphicsBeginImageContext（[layer frame] .size）; 
 [layer renderInContext：UIGraphicsGetCurrentContext（）]; 
 UIImage * outputImage = UIGraphicsGetImageFromCurrentImageContext（）; 
 UIGraphicsEndImageContext（）; 
返回outputImage; 
} 
  

使用图层和初始化稍微玩一下，因为我没有测试代码..

I am trying to display a grid of documents (saved in the documents directory) but I don't know how to generate the thumbnails for the documents. The documents can be anything that a QLPreviewController can display. PDF's and Images are fine to do but other things like .doc's I don't know about. Any guidance would help.

解决方案

Since you have an UIView that can display any of this documents you could just take a shortcut:

-Create an instance of your preview controller with displayed document

-Do not add this view/controller to anything

-Create image from its layer

This might help:

+ (UIImage *)imageFromView:(UIView *)view {
    CALayer *layer = view.layer;
    UIGraphicsBeginImageContext([layer frame].size);
    [layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *outputImage = UIGraphicsGetImageFromCurrentImageContext();    
    UIGraphicsEndImageContext();    
    return outputImage;
}

Play around a bit with layers and initialization as I didn't test the code..

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