可可：如何渲染视图到图像？

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问题描述

我想知道是否有任何方法来呈现视图的图像？就像一个截图，但我可以指定任何视图的方法。我知道如何做在ios。，但是如何在mac os中做呢？

I want to know is there any method to render a view to image? just like a screenshot, but I can specify any view to that method. I know how to do it in ios. Saving view content, but how can I do it in mac os ?

推荐答案

有几种方法，工作完美。
许多问题都与Layer Backed视图相关联。

There are several ways, but non of them works perfect.Many problems are connected with Layer Backed views.

如果没有图层备份或托管视图，您可以使用此代码：

if you don't have layer backing or hosting views you can use this code:

    NSData* data = [mainView dataWithPDFInsideRect:[mainView bounds]];
    NSImage *img = [[NSImage alloc] initWithData:data];

：

到10.8对我来说最好的方法是

till 10.8 the best way for me was

        NSSize mySize = mapImage.bounds.size;
        NSSize imgSize = NSMakeSize( mySize.width, mySize.height );
        NSBitmapImageRep *bir = [mapImage bitmapImageRepForCachingDisplayInRect:[mapImage bounds]];
        [bir setSize:imgSize];
        [mapImage cacheDisplayInRect:[mapImage bounds] toBitmapImageRep:bir];
        caheImg = [[NSImage alloc]initWithSize:imgSize];
        [caheImg addRepresentation:bir];

但在10.8 bitmapImageRepForCachingDisplayInRect 已备份的视图。

but in 10.8 bitmapImageRepForCachingDisplayInRect stopped working with Layer Backed views.

有一个选项用于截取屏幕截图并剪下您的视图：

there is an option to make a screenshot of your screen and cut out your view:

+ (NSImage*) screenCacheImageForView:(NSView*)aView
{
    NSRect originRect = [aView convertRect:[aView bounds] toView:[[aView window] contentView]];

    NSRect rect = originRect;
    rect.origin.y = 0;
    rect.origin.x += [aView window].frame.origin.x;
    rect.origin.y += [[aView window] screen].frame.size.height - [aView window].frame.origin.y - [aView window].frame.size.height;
    rect.origin.y += [aView window].frame.size.height - originRect.origin.y - originRect.size.height;

    CGImageRef cgimg = CGWindowListCreateImage(rect,
                                           kCGWindowListOptionIncludingWindow,
                                           (CGWindowID)[[aView window] windowNumber],
                                           kCGWindowImageDefault);
    return [[NSImage alloc] initWithCGImage:cgimg size:[aView bounds].size];
}

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