Hi pro, I customize an UIView and using drawLayer method with CATileLayer for improve the speed to rendering content. But the problem is the drawLayer method run as random, in a page, I have 6 tiles, but the drawLayer method dont call in the order tile 0 to tile 5. I need to find a way to manage them, because I need to know the content of last tile to build the current tile. (to build tile 1, I have to know the content of tile 0 and so on). Is there anyway to make the drawLayer method call in the order of 0 to 5 ? Can anyone help me ?, I try 2 days, but I can not find a good solution. Please help me.