unity, Animator.ResetTrigger

解：

正确的写法应该是：
Animator.SetTrigger("unfoldTrigger")
Animator.ResetTrigger("unfoldTrigger")
Animator.SetTrigger("foldTrigger") 

参考：http://answers.unity3d.com/questions/801875/mecanim-trigger-getting-stuck-in-true-state.html