目标:app只在个别界面支持屏幕的横向旋转,别的界面都是只能竖屏
1.首先勾选手机支持的旋转方向
2. AppDelegate.h中设置一个属性
@property(nonatomic,assign)BOOL allowRotation;//是否允许在横向上旋转
AppDelegate.m中实现如下方法
- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(nullable UIWindow *)window{
if (_allowRotation == YES) { // 如果属性值为YES,则允许屏幕旋转
return UIInterfaceOrientationMaskLandscape; // 这里是屏幕要旋转的方向(只能在横屏方向旋转)
}else{
return (UIInterfaceOrientationMaskPortrait);//只能竖屏
}
}
3.在需要横向旋转的界面做一下设置
AppDelegate * appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
appDelegate.allowRotation = YES;//(以上2行代码,可以理解为打开横屏开关)
[self setNewOrientation:YES];//调用转屏代码(即一旦进入该界面就成为横屏)
#pragma mark--- 设置屏幕旋转
- (void)setNewOrientation:(BOOL)fullscreen
{
if (fullscreen) {
NSNumber *resetOrientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationUnknown];
[[UIDevice currentDevice] setValue:resetOrientationTarget forKey:@"orientation"];
NSNumber *orientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationLandscapeRight];
[[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];
}else{
NSNumber *resetOrientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationUnknown];
[[UIDevice currentDevice] setValue:resetOrientationTarget forKey:@"orientation"];
NSNumber *orientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationPortrait];
[[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];
}
}
4.在退出横屏界面是作如下设置
AppDelegate * appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
appDelegate.allowRotation = NO;//关闭横屏仅允许竖屏
[self setNewOrientation:NO];
- (void)setNewOrientation:(BOOL)fullscreen
{
if (fullscreen) {
NSNumber *resetOrientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationUnknown];
[[UIDevice currentDevice] setValue:resetOrientationTarget forKey:@"orientation"];
NSNumber *orientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationLandscapeRight];
[[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];
}else{
NSNumber *resetOrientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationUnknown];
[[UIDevice currentDevice] setValue:resetOrientationTarget forKey:@"orientation"];
NSNumber *orientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationPortrait];
[[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];
}
}