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UIViewController 的属性presentingViewController
// The view controller that presented this view controller (or its farthest ancestor.)
@property(nonatomic,readonly) UIViewController *presentingViewController NS_AVAILABLE_IOS(5_0);
@property(nonatomic,readonly) UIViewController *presentingViewController NS_AVAILABLE_IOS(5_0);
a present b，b present c 。 现在要从c中直接回到a
if ([self respondsToSelector:@selector(presentingViewController)]) {
[self.presentingViewController dismissViewControllerAnimated:YES completion:NULL];
}
[self.presentingViewController dismissViewControllerAnimated:YES completion:NULL];
}
UIViewController 的属性presentingViewController
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