Never saw code with UIView.opaque assignment, whatever alpha or backgroundColor it uses. Is this flag ignored by system?
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It determines how many channels are in the backing store buffer that gets made for the layer if you implement drawRect:.
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so the doc is incorrect? According to it, if alpha < 1 or backgroundColor.alpha < 1 something bad would happen, but never.
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UIVIew.opaque(developer.apple.com/library/ios/do) VS CALayer.opaque(developer.apple.com/library/mac/do). The latter is consistent with you.
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Eh. Basically UIView makes no promises if you set opaque=YES and don’t fill with opaque contents. Might be okay now; could change.
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"opaque contents" is interesting. iOS doc is more specific: developer.apple.com/library/ios/do But is backgroundColor deemed contents?
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That qualifies here, yeah.
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what's interesting is .opaque is actually orthogonal to .contents per doc, but we'r still talking about "opaque contents"...