let tapStepGestureRecognizer = UITapGestureRecognizer(target: self, action: Selector("enterStepDetail"))
stepLogo.addGestureRecognizer(tapStepGestureRecognizer)
func enterStepDetail(){
print("step detail ok")
}
//我现在的代码，但是下面的方法不执行。userInteractionEnabled 默认是false,需要设置为true
//添加这行代码就可以了，意思是接收交互
stepLogo.userInteractionEnabled = true