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Xcode6.2，OSX 10.10.3beta，為什么在iOS7.1模擬器中可以正常運行，在iOS8版本以上模擬器中無效。。。

    - (void)titleButtonClick:(XXTitleButton *)titleButton {
    UIImage *down = [UIImage imageWithName:@"navigationbar_arrow_down"];
    UIImage *up = [UIImage imageWithName:@"navigationbar_arrow_up"];
    if (titleButton.currentImage == down) {
        [titleButton setImage:up forState:UIControlStateNormal];
        [self.view addSubview:self.titleMenu];
    }else {
        [titleButton setImage:down forState:UIControlStateNormal];
        [self.titleMenu removeFromSuperview];
    }

}