使用未声明的类型错误：Swift

Question

I have some Objective-C files with defined classes.

However when I try to create a instance of the class in Swift I get an error :

What should I do to resolve this error?

Answer 1

To be able to use Obj-C files from Swift project you should add Objective-C Bridging Header file. Create some h file and declare import statement for all necessary classes. Then in build settings find Objective-C Bridging Header item and set the name of your file

Answer 2

You are trying to merge Objective-C code with Swift . Therefore, you should use Objective-C Bridging Header in between. Detail information could be found in the official document: https://developer.apple.com/library/ios/documentation/Swift/Conceptual/BuildingCocoaApps/MixandMatch.html