[常用代码]获取状态栏和导航栏尺寸

• 获取状态栏尺寸

CGRect statusBarFrame = [[UIApplication sharedApplication] statusBarFrame];
//    statusBar width - 320.000000
//    statusBar height - 20.000000

• 获取导航栏尺寸

CGRect navigationBarFrame = self.navigationController.navigationBar.frame;
//    navigationBar width - 320.000000
//    navigationBar height - 44.000000