在应用中有几个UIViewController。其中一个willAnimateRotationToInterfaceOrientation 事件调用成功了。
如何让willAnimateRotationToInterfaceOrientation对所以可见视图有效？
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RootViewController中:
- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
NSDictionary *userInfo = @{
@"toInterfaceOrientation":@(toInterfaceOrientation),
@"duration":@(duration)};
[[NSNotificationCenter defaultCenter] postNotificationName:@"willAnimateRotationToInterfaceOrientation" object:nil userInfo:userInfo];
}其他的 UIViewControllers:
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(willAnimateRotationToInterfaceOrientation:) name:@"willAnimateRotationToInterfaceOrientation" object:nil];
}
return self;
}
- (void)willAnimateRotationToInterfaceOrientation:(NSNotification *)notification {
UIInterfaceOrientation toOrientation = (UIInterfaceOrientation)[notification.userInfo[@"toOrientation"] intValue];
NSTimeInterval duration = (UIInterfaceOrientation)[notification.userInfo[@"duration"] floatValue];
[self willAnimateRotationToInterfaceOrientation:toOrientation duration:duration];
}
- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation duration:(NSTimeInterval)duration {
// ...
}
- (void)dealloc {
[[NSNotificationCenter defaultCenter] removeObserver:self];
[super dealloc];
}