On iOS，If we want to display a shadow View，So basically do：
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self.view.layer?.shadowColor = NSColor.black.cgColor self.view.layer?.shadowOpacity = 0.1 self.view.layer?.shadowOffset = CGSize(width: 0, height: 0) self.view.layer?.shadowRadius = 3 self.view.layer?.masksToBounds = false |
but，To the macOS，This would not work - no effect。
The answer lies in the macOS a View If you want to use layer ，You must manually mark，For example, this：
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self.view.wantsLayer = true |
This time，What if you are 10.13，Then everything will be fine，Then 10.12 The discovery - still no effect。
Why is this? Apple's official guide，We can find the answer，He says you should not be modified directly NSView of layer Attributes，So you should first create a NSShadow() Example，Then modify its properties，Finally, assign it to NSView 。For example, the following code，It is the proper operation：
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self.view.wantsLayer = true let shadow = NSShadow() shadow.shadowColor = NSColor.black.cgColor shadow.shadowOpacity = 0.1 shadow.shadowOffset = CGSize(width: 0, height: 0) shadow.shadowRadius = 3 self.view.shadow = shadow self.view.layer?.backgroundColor = NSColor.white.cgColor self.view.layer?.cornerRadius = 8 self.view.layer?.masksToBounds = false |
or，You can also simply point，Give layer One shadow Example，Then go to modify them。
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self.view.wantsLayer = true self.view.shadow = NSShadow() self.view.layer?.backgroundColor = NSColor.white.cgColor self.view.layer?.cornerRadius = 8 self.view.layer?.shadowColor = NSColor.black.cgColor self.view.layer?.shadowOpacity = 0.1 self.view.layer?.shadowOffset = CGSize(width: 0, height: 0) self.view.layer?.shadowRadius = 3 self.view.layer?.masksToBounds = false |
Original article written by LogStudio：R0uter's Blog » In NSView 10.12 Detailed problem does not show shadow
Reproduced Please keep the source and description link：https://www.logcg.com/archives/2946.html
