Swift - 带三角形的模糊圆圈 - 模糊效果始终位于顶部

I am trying to create a simple circle button and put a triangle inside this button, it´s a play button actually. The problem is that when i add the BlurEffect to the button it is always at the top and will hide the triangle. Is there a way to add the triangle above the blur effect ?I am trying to create a simple circle button an