Wil Shipley questions

Wil Shipley answers

• CGImageSourceCreateWithURL returns always NULL
• iOS Core Data Migration big Issue
• How to remove CoreData's objects from memory?
• Line Number for Selected String in TextView
• Converting cv::Mat to MTLTexture
• Converting a C string inside a struct to a Swift String
• Keeping and NSDocument open without any windows
• KeyDown not working
• How to see what label color is on a file/folder from within Termnal (Mac OS X)
• Objective C chaining calls