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Can I draw to the same CGContextRef from multiple threads?

UTF8String public class RenderImageView: UIView { var bitmapContext: CGContext? let drawQueue: dispatch_queue_attr_t = { let q = dispatch_queue_create(QVAL, ...

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查詢 「CGContext」的人也找了：

  1. CGContextRef
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  8. UIGraphicsGetCurrentContext
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