在某ViewController强制转屏或者禁止转屏或者强制屏幕旋转方向。
这些方法都不能在subViewController中执行。
禁止/允许转屏：
- (BOOL)shouldAutorotate { return YES; }禁止/允许转屏：
屏幕旋转方向：
- (NSUInteger)supportedInterfaceOrientations { return (UIInterfaceOrientationMaskAll); }
Delegate
Each delegate is responsible for a specific role or task to keep the system simple and clean.Whenever an object needs to perform a certain task, it depends on another object to handle it. This is usually known as “separation of concerns” in software design.
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