[iOS]深度遍历view的subview

-(void)allView:(UIView *)rootView {
    for (UIView *subView in [rootView subviews])
    {
        if (!rootView.subviews.count) {
            return;
        }
        if ([subView isKindOfClass:[UITextField class]]) {
            [(UITextField *)subView resignFirstResponder];
        }
        [self allView:subView];
    }
}