IBDesignable和IBInspectable(xcode的所见即所得)

- cmd + Q (偶尔可以)
- Try deleting derived data. 1. Close Editor window of your Xcode and quit simulator -> 2. Go to Xcode Preferences -> Locations -> 3. Click small grey arrow showing derived data path -> 4. Select your project -> 5. Delete all the folders inside -> 6. Quit Xcode and reopen (强烈建议)
最终效果如下 Updating --- Up to date

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