Swift Error

How To Fix Swift Error Unable To Activate Constraint With Anchors Because They Have No Common Ancestor & LayoutConstraints Unable To Simultaneously Satisfy Constraints

When i develop an iOS app, i add a UITextField in the app UI programmatically. And i also add some constraints to the UITextField object in swift source code to make it auto layout. But when i run the app, it throws an exception with error message ‘NSGenericException’, reason: ‘Unable to activate constraint with anchors, …

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How To Fix Xcode Error Failed To Find Or Create Execution Context For Description IBCocoaTouchPlatformToolDescription

When i upgrade my Xcode to version 10.3 and build my iOS project, i meet an error message like this Failed to find or create execution context for description ‘<IBCocoaTouchPlatformToolDescription: 0x7fe0cfa54080> System content for IBCocoaTouchFramework-ElevenAndLater <IBScaleFactorDeviceTypeDescription: 0x7fe0cfa63cb0> scaleFactor=2x’. These intermediate objects were non-nil:. This error confused me a lot of time. But finally i find …

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