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我有一個程序,我在後臺線程上運行一個完成塊。在塊內部,我設置了一個CGImageRef,然後在主線程中設置了我的圖層內容。問題是,有時應用程序在主線程部分崩潰。線程,塊,CGImageRef和範圍問題
這是完成塊,在下面的代碼同時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];
};
我完成塊的最後一行是調用displayFullSize聲明。該功能在下面。
- (void)displayFullSize
{
[self setContents:(__bridge id)(cgFullImage)];
}
您是否看到或知道setContents失敗的原因?
感謝 喬
感謝您的迴應。 添加一個typedef和一個類級別的屬性做了訣竅。 'typedef __attribute __((NSObject))CGImageRef RenderedImageRef; @property(strong,nonatomic)RenderedImageRef renderedImage;' 快樂編碼, Joe –