在创建的vc中
//指定能够支持的orientation有哪些
-(UIInterfaceOrientationMask)supportedInterfaceOrientations{
//默认的情况下是maskAllButUpSideDown
return UIInterfaceOrientationMaskAll;
}
//解决statusBar在翻转过程消失
-(BOOL)prefersStatusBarHidden{
return NO;
}
//强制旋转方法一 不会改变statusbar
self.view.transform=CGAffineTransformMakeRotation(M_PI_2);
//强制旋转方法二 设置固定值
NSNumber* value=[NSNumber numberWithInteger:UIDeviceOrientationPortrait];
[[UIDevice currentDevice]setValue:value forKey:@"orentation"];
设备或interface旋转的通知
//添加observer来观察通知， selector需要自己实现, name是系统封装好的通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(DeviceOrientationChanged:) name:UIDeviceOrientationDidChangeNotification object:nil];
//Interface通知 UIApplicationStatusBar很形象 状态栏的方向改变
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(InterfaceOritationChanged:) name:UIApplicationDidChangeStatusBarOrientationNotification object:nil];
//键盘相关
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(KeybordDidShow:) name:UIKeyboardDidShowNotification object:nil];
屏幕发生旋转时改变布局
-(void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id)coordinator{
//第一个block表示正在旋转中 第二个block就是选装结束了
[coordinatoranimateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> _Nonnull context) {
if(UIInterfaceOrientationIsPortrait([UIApplication sharedApplication].statusBarOrientation))
{//do layout}
else{//do layout}
}completion:^(id<UIViewControllerTransitionCoordinatorContext> _Nonnull context) {
NSLog(@"screen boundes %@",NSStringFromCGRect(self.view.bounds));
}];
//需要调用super的默认方法 要不就不向子类传递了
[super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
}
//同样的事情也可以在-(void)viewDidLayoutSubviews来做
-(void)viewDidLayoutSubviews{
if(UIInterfaceOrientationIsPortrait([UIApplication sharedApplication].statusBarOrientation)) {//do layout} else{//do layout}
}
