In your Podfile, you specified use_frameworks!.
As a result, the Objective-C code you’re including as a dependency (DBSphereTagCloud) is packaged as a framework, instead of a static library. Please see CocoaPods 0.36 – Framework and Swift Support for more details.
As a consequence, you don’t need a bridging header file. It’s enough for you to add:
import DBSphereTagCloud
in all the Swift files that need that module.