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UIView implements this method by returning the UIViewController object that manages it (if it has one) or its superview (if it doesn’t); UIViewController implements the method by returning its view’s superview; UIWindow returns the application object, and UIApplication returns nil.

id next = [self nextResponder];
while(![next isKindOfClass:[ViewController class]]) {
    next = [next nextResponder];
}
if ([next isKindOfClass:[ViewController class]]) {
    controller = (ViewController *)next;
}

网页名称：IOS响应事件传递nextResponder
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