【iOS】获取视图的中心和宽高

NSLog(@"%f, %f", self.view.center.x, self.view.center.y);
NSLog(@"%f, %f", self.view.bounds.origin.x, self.view.bounds.origin.y);
NSLog(@"%f, %f", self.view.bounds.size.width, self.view.bounds.size.height);