IOS 学习笔记

好多杂乱的东西记不清了//[selfcreatRandomValue];//[selfcreatGCDAsyne];//异步//[selfcreatGCDSyne];//[selfcreatGCDUseBlock];//[selfdispatchGroup];//[selfsemaphore];//信号量//[selfstaticBOOL];//[selfrunSpinAnimationOnView:self.img.layerduration:3rotations:M_PIrepeat:3];