# 1. 全局禁止横屏
在Appdelegate.h添加以下属性：
/*** 是否允许横屏的标记 */
@property (nonatomic,assign)BOOL allowRotation;
Appdelegate.m添加如下代码：
-(UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
if (self.allowRotation) {//如果设置了allowRotation属性，支持全屏
return UIInterfaceOrientationMaskAll;
}
return UIInterfaceOrientationMaskPortrait;//默认全局不支持横屏
}
2. 在需要支持横屏的界面改变allowRotation属性
//进入全屏
-(void)begainFullScreen
{
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
appDelegate.allowRotation = YES;
}
// 退出全屏
-(void)endFullScreen
{
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
appDelegate.allowRotation = NO;
//强制归正：
if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {
SEL selector = NSSelectorFromString(@"setOrientation:");
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];
[invocation setSelector:selector];
[invocation setTarget:[UIDevice currentDevice]];
int val =UIInterfaceOrientationPortrait;
[invocation setArgument:&val atIndex:2];
[invocation invoke];
}
}
在viewWillAppear和viewWillDisappear分别调用以上方法，在该控制器下即可顺利支持全屏。
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[self begainFullScreen];
}
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
[self endFullScreen];
}
