sgbutton
把SgButton.swift加入項(xiàng)目工程就可以了。

使用方法：

    func initUI() {
        let btnPlay = SgButton(normalImageNamed: "bkbtn.png", highlightedImageNamed: "bkbtn_d.png",  buttonFunc: callbackPlay )
        
        btnPlay.setString(.normal, string: "Play")
        btnPlay.setString(.highlighted, string: "Play")
        self.addChild(btnPlay)
        btnPlay.position = CGPoint(x: frame.width*0.5, y: frame.height*0.5)
    }
    
    func callbackPlay(_ button: SgButton) {
        print("play go")
    }