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我有一个程序,我在后台线程上运行一个完成块。在块内部,我设置了一个CGImageRef,然后在主线程中设置了我的图层内容。问题是,有时应用程序在主线程部分崩溃。线程,块,CGImageRef和范围问题
这是完成块,在下面的代码同时fullImage和cfFullImage在我的.h
requestCompleteBlock completionBlock = ^(id data)
{
// Seems I need to hold onto the data for use later
fullImage = (NSImage*)data;
NSRect fullSizeRect = NSMakeRect(0, 0, self.frame.size.width, self.frame.size.height);
// Calling setContents with an NSImage is expensive because the image has to
// be pushed to the GPU first. So, pre-emptively push it to the GPU by getting
// a CGImage instead.
cgFullImage = [fullImage CGImageForProposedRect:&fullSizeRect context:nil hints:NULL];
// Rendering needs to happen on the main thread or else crashes will occur
[self performSelectorOnMainThread:@selector(displayFullSize) withObject:nil waitUntilDone:NO];
};
我完成块的最后一行是调用displayFullSize声明。该功能在下面。
- (void)displayFullSize
{
[self setContents:(__bridge id)(cgFullImage)];
}
您是否看到或知道setContents失败的原因?
感谢 乔
感谢您的回应。 添加一个typedef和一个类级别的属性做了诀窍。 'typedef __attribute __((NSObject))CGImageRef RenderedImageRef; @property(strong,nonatomic)RenderedImageRef renderedImage;' 快乐编码, Joe –