错误提示

*** Terminating app due to uncaught exception 'NSInvalidArgumentException',reason: '-[DBFM.ViewController onPlay]: unrecognized selector sent to instance 0x7fe3586a3820'

btnPlay.addTarget(self,action: "onPlay",forControlEvents: UIControlEvents.TouchUpInside)

解决方法

(带参数的方法应该加上冒号: )

btnPlay.addTarget(self,action: "onPlay:",forControlEvents: UIControlEvents.TouchUpInside)