在 APPDelegate.h 文件中增加屬性：是否支持橫屏

/***  是否允許橫屏的標(biāo)記 */
@property (nonatomic,assign)BOOL allowRotation;

在 APPDelegate.m 文件中增加方法，控制全部不支持橫屏

- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
    if (self.allowRotation) {
        return  UIInterfaceOrientationMaskAllButUpsideDown;
    }
    return UIInterfaceOrientationMaskPortrait;
}

這樣在其他界面想要橫屏的時(shí)候，我們只要控制 allowRotation 這個(gè)屬性就可以控制其他界面進(jìn)行橫屏了。

//需在上面#import "AppDelegate.h"
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
appDelegate.allowRotation = YES;
//不讓橫屏的時(shí)候 appDelegate.allowRotation = NO;即可

需要橫屏?xí)r，進(jìn)入界面時(shí)

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
//如果有導(dǎo)航設(shè)置的話 先設(shè)置導(dǎo)航
    [self.navigationController setNavigationBarHidden:YES animated:YES];
    [self begainFullScreen];
}

-(void)begainFullScreen
{
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    appDelegate.allowRotation = YES;
}

需要橫屏?xí)r，退出界面時(shí)

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
//如果有導(dǎo)航設(shè)置的話 先設(shè)置導(dǎo)航
    //[self.navigationController setNavigationBarHidden:NO animated:YES];
    //不讓橫屏的時(shí)候
    [self endFullScreen];
}

// 退出全屏
-(void)endFullScreen
{
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    appDelegate.allowRotation = NO;

    //強(qiáng)制歸正：
    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];
    }
}

界面橫屏 所以這里可以使用 通知，就可以解決

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(begainFullScreen) name:UIWindowDidBecomeVisibleNotification object:nil];//進(jìn)入全屏
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(endFullScreen) name:UIWindowDidBecomeHiddenNotification object:nil];//退出全屏
在退出全屏?xí)r，增加邏輯讓其強(qiáng)制編程豎屏，這樣當(dāng)退出時(shí)就會(huì)自動(dòng)變成豎屏了。
```





```
// 進(jìn)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;

    //強(qiáng)制歸正：
    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];
    }
}
```
一進(jìn)入頁(yè)面就橫屏:
```
NSNumber *orientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationLandscapeLeft];
    [[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];
```