在 APPDelegate.h 文件中增加属性:是否支持横屏
/*** 是否允许横屏的标记 */
@property (nonatomic,assign)BOOL allowRotation;
在 APPDelegate.m 文件中增加方法,控制全部不支持横屏
- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
if (self.allowRotation) {
return UIInterfaceOrientationMaskAllButUpsideDown;
}
return UIInterfaceOrientationMaskPortrait;
}
这样在其他界面想要横屏的时候,我们只要控制 allowRotation 这个属性就可以控制其他界面进行横屏了。
//需在上面#import "AppDelegate.h"
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
appDelegate.allowRotation = YES;
//不让横屏的时候 appDelegate.allowRotation = NO;即可
界面横屏 所以这里可以使用 通知,就可以解决
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(begainFullScreen) name:UIWindowDidBecomeVisibleNotification object:nil];//进入全屏
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(endFullScreen) name:UIWindowDidBecomeHiddenNotification object:nil];//退出全屏
在退出全屏时,增加逻辑让其强制编程竖屏,这样当退出时就会自动变成竖屏了。
// 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];
}
}
一进入页面就横屏:
NSNumber *orientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationLandscapeLeft];
[[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];
//刷新
// [UIViewController attemptRotationToDeviceOrientation];
本文介绍了一种在iOS应用中灵活控制横竖屏显示的方法。通过在AppDelegate中添加allowRotation属性,可以方便地切换横竖屏模式。同时,利用通知机制实现页面全屏时自动横屏,退出全屏时强制竖屏。

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