在drawRect之外获取NSView的CGContextRef？

I need to get CGContextRef of NSView object. It won't be so bad if I knew how.

我需要获取NSView对象的CGContextRef。如果我知道如何,情况就不会那么糟糕。

In Carbon this thing was done like this:

在Carbon这个事情是这样做的:

CGContextRef cgref = (libvlc_drawable_t)GetWindowPort(HIViewGetWindow((OpaqueControlRef*)hiViewRef));

Obviously it can be done by subclassing NSView (or it's subclass) and catching it in it's drawRect, but that's too ugly.

显然,它可以通过继承NSView(或它的子类)并在它的drawRect中捕获它来完成,但这太难看了。

Your ideas?

1 个解决方案

#1

I've never used it but it think this is your way:

我从来没有用它,但它认为这是你的方式:

[myView lockFocus];
imageContext = (CGContextRef)[[NSGraphicsContext currentContext]
                                     graphicsPort];
... 
[myView unlockFocus];

also have a look to the lockFocusIfCanDraw of NSView

另外看看NSView的lockFocusIfCanDraw

#1