SpriteKit / Obj-C -Restarting游戏接触开始于nodesatPoint

I ma having trouble restarting my game with my SKSpriteNode playAgainButton with a name property of "play". The game over method is working fine, but I cannot restart the game in the touches began function. Here are the respective functions. Any help would be great, I have been stuck for a while on this problem and have tried several different methods in the doc including - (CGPoint)convertPoint:(CGPoint)point fromNode:(SKNode *)node; and - (NSArray *)nodesAtPoint:(CGPoint)p;I ma having trouble restarting my game with my