present viewcontroller
addsubview viewcontroller
tabbarcontroller viewcontrollers
uinavigationcontroller viewcontrollers
presentedViewController
被弹出的模态控制器的presentingViewController，是它的上级容器控制器。
-(UIViewController *)topMostController
{
NSMutableArray *controllersHierarchy = [[NSMutableArray alloc] init];
UIViewController *topController = self.window.rootViewController;
if (topController)
{
[controllersHierarchy addObject:topController];
}
while ([topController presentedViewController]) {
topController = [topController presentedViewController];
[controllersHierarchy addObject:topController];
}
UIResponder *matchController = [self viewController];
while (matchController != nil && [controllersHierarchy containsObject:matchController] == NO)
{
do
{
matchController = [matchController nextResponder];
} while (matchController != nil && [matchController isKindOfClass:[UIViewController class]] == NO);
}
return (UIViewController*)matchController;
}
// 与下面等价？
-(UIViewController *)topMostController
{
UIResponder *matchController = [self viewController];
return ((UIViewController*)matchController).presentingViewController;
}
-(UIViewController*)viewController
{
UIResponder *nextResponder = self;
do
{
nextResponder = [nextResponder nextResponder];
if ([nextResponder isKindOfClass:[UIViewController class]])
return (UIViewController*)nextResponder;
} while (nextResponder != nil);
return nil;
}
Paste_Image.png
nextResponder
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