Setting masked corners in Interface Builder

Question

What type of value is [.layerMaxXMinYCorner, .layerMinXMinYCorner]? Is it possible to set this parameter on a View in Interface Builder? I know how to set layer.borderWidth, layer.borderUIColor and layer.cornerRadius in the Identity Inspector, but I can't figure out the right Type and Value to use for masked corners.

Thanks!

Jake

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Update: here are the integer values for each combination (in terms of which are rounded):

• 0: no rounded corners
• 1: top left
• 2: top right
• 3: top left & right (both top corners)
• 4: bottom left
• 5: top & bottom left (both left corners)
• 6: top right & bottom left
• 7: top left & right, bottom left (all corners except bottom right)
• 8: bottom right
• 9: top left, bottom right
• 10: top & bottom right (both right corners)
• 11: both top corners, bottom right (all corners except bottom left)
• 12: bottom left & right (both bottom corners)
• 13: bottom left & right, top left (all corners except top right)
• 14: bottom left & right, top right (all corners except top left)
• 15: all corners rounded

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• Top left is in 1, 3, 5, 7, 9, 11, 13, 15
• Top right is in 2-3, 6-7, 10-11, 14-15
• Bottom left is in 4-7, 12-15

• Bottom right is in 8-15

• Both top corners are in 3, 7, 11, 15

• Both right corners are in 10-11, 14,15
• Both bottom corners are in 12-15
• Both left corners are in 5, 7, 13, 15

Answer 1

maskedCorners is a CACornerMask, which is an OptionSet, or bit mask. The raw value is an integer: in code, you can try printing the value of someView.layer.maskedCorners.rawValue, or setting it via someView.layer.maskedCorners.setValue(3, forKey: "maskedCorners").

So you should be able to set the value of layer.maskedCorners to the integer 3 (or whatever you need) in Interface Builder, and I don't see why it would be unsafe to do this. Though it will be a pain to figure out what set of corners that integer value actually maps to if you forget.