第一步: 要实现这种效果必须有这个设置，这个是前提条件哈，
第二步：在AppDelegate.h的文件中添加属性（如下所示）
@property (assign,nonatomic) BOOL isAllowRevolve;
第三步：在AppDelegate.m的文件中实现代理方法（如下所示）
-(NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
if (self.isAllowRevolve) {
return UIInterfaceOrientationMaskAll;
}
return UIInterfaceOrientationMaskPortrait;
}
好了下面我们看看怎么使用它
第四步：在需要允许的Controller中的viewDidLoad方法中写监听
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(allowRevolve:) name:UIApplicationDidChangeStatusBarFrameNotification object:nil];
然后实现监听事件
- (void)allowRevolve:(NSNotification*)notify {
if ([[UIDevice currentDevice] orientation] == UIInterfaceOrientationPortrait
|| [[UIDevice currentDevice] orientation] == UIInterfaceOrientationPortraitUpsideDown) {
//竖屏
//竖屏操作
} else {
//横屏
//******横屏操作
}
}
第四步：在需要允许的Controller中的viewWillAppear方法中写
-(void)viewWillAppear:(BOOL)animated{
AppDelegate *selfDel = (AppDelegate *)[UIApplication sharedApplication].delegate;
selfDel.allowRotation = YES;
}
最后一步
第五步：一定要在viewWillDisappear的方法里移除监听
-(void)viewWillDisappear:(BOOL)animated
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
AppDelegate *selfDel = (AppDelegate *)[UIApplication sharedApplication].delegate;
selfDel.allowRotation = NO;
//由横屏状态的屏幕返回竖屏屏幕的时候添加以下处理
NSNumber *orientationUnknown = [NSNumber numberWithInt:0];
[[UIDevice currentDevice] setValue:orientationUnknown forKey:@"orientation"];
NSNumber *orientationTarget = [NSNumber numberWithInt:1];
[[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];
}