IBDesignable IBInspectable

IBDesignable和IBInspectable（xcode的所见即所得）

蓝框即为构建失败.png

解决方案： https://stackoverflow.com/questions/27374330/ibdesignable-error-ib-designables-failed-to-update-auto-layout-status-interf

1. cmd + Q （偶尔可以）
2. 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

右侧Designable 状态变化.gif