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1、屏蔽AppDelegate下面的屏幕旋转方法
#pragma mark - 屏幕旋转的 //- (UIInterfaceOrientationMask)application:(UIApplication*)application supportedInterfaceOrientationsForWindow:(UIWindow*)window //{ // return UIInterfaceOrientationMaskPortrait; //}
2、对UINavigationController和UITabBarController写两个扩展类别,此东西不需要在具体的ViewController中引用
UINavigationController+Autorotate.h
// // UINavigationController+Autorotate.h // fitmiss // // Created by bill on 15/12/16. // Copyright © 2015年 lear. All rights reserved. // #import <UIKit/UIKit.h> @interface UINavigationController (Autorotate) @end
UINavigationController+Autorotate.m
// // UINavigationController+Autorotate.m // fitmiss // // Created by bill on 15/12/16. // Copyright © 2015年 lear. All rights reserved. // #import "UINavigationController+Autorotate.h" @implementation UINavigationController (Autorotate) - (BOOL)shouldAutorotate { return [self.topViewController shouldAutorotate]; } - (NSUInteger)supportedInterfaceOrientations { return [self.topViewController supportedInterfaceOrientations]; } - (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation { return [self.topViewController preferredInterfaceOrientationForPresentation]; } @end
UITabBarController+Autorotate.h
// // UITabBarController+Autorotate.h // fitmiss // // Created by bill on 15/12/16. // Copyright © 2015年 lear. All rights reserved. // #import <UIKit/UIKit.h> @interface UITabBarController (Autorotate) @end
UITabBarController+Autorotate.m
// // UITabBarController+Autorotate.m // fitmiss // // Created by bill on 15/12/16. // Copyright © 2015年 lear. All rights reserved. // #import "UITabBarController+Autorotate.h" @implementation UITabBarController (Autorotate) - (BOOL)shouldAutorotate { return [self.selectedViewController shouldAutorotate]; } - (NSUInteger)supportedInterfaceOrientations { return [self.selectedViewController supportedInterfaceOrientations]; } - (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation { return [self.selectedViewController preferredInterfaceOrientationForPresentation]; } @end
3.在使用的ViewController中的再次重写这三个方法,可以在根ViewController中重写如下方法,就能实现竖屏
- (BOOL)shouldAutorotate { return NO; }
摘自网上网友的回复内容,如下:
以下方法仅对deploy target大于等于iOS6的工程有效,如果题主的应用需要支持iOS5(默哀),请pass。
- (BOOL)shouldAutorotate
{
return [self.selectedViewController shouldAutorotate];
}
- (NSUInteger)supportedInterfaceOrientations
{
return [self.selectedViewController supportedInterfaceOrientations];
}
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
return [self.selectedViewController preferredInterfaceOrientationForPresentation];
}
- (BOOL)shouldAutorotate
{
return [self.topViewController shouldAutorotate];
}
- (NSUInteger)supportedInterfaceOrientations
{
return [self.topViewController supportedInterfaceOrientations];
}
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
return [self.topViewController preferredInterfaceOrientationForPresentation];
}
流程说明
首先,对于任意一个viewController,iOS会以info.plist中的设置和当前viewController的preferredInterfaceOrientationForPresentation和supportedInterfaceOrientations三者支持的方法做一个交运算,若交集不为空,则以preferredInterfaceOrientationForPresentation为初始方向,交集中的所有方向均支持,但仅在shouldAutorotate返回YES时,允许从初始方向旋转至其他方向。若交集为空,进入viewController时即crash,错误信息中会提示交集为空。
其次,UINavigationController稍有些特别,难以用常规API做到同一个naviVC中的ViewController在不同方向间自如地切换。(如果去SO之类的地方搜索,会找到一个present empty viewController and then dismiss it之类的hacky trick,不太建议使用),如果要在横竖屏间切换,建议使用presentXXX方法。
再次,AppDelegate中有一个委托方法可以动态的设置应用支持的旋转方向,且此委托的返回值会覆盖info.plist中的固定设置。使用该方法的便利之处不言自明,但缺点是搞明白当前哪个ViewController即将要被显示,很可能会导致耦合增加;
最后,以上均为个人在iOS8 SDK下得到的实践结果,请题主结合工程实际参考使用。
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原文地址:http://www.cnblogs.com/lear/p/5051818.html