滑动隐藏导航栏后下拉显示时返回箭头不见了

[ChinaFanny]

当navigationcontroller执行 push操作后，返回按钮是系统的，滑动隐藏导航栏后下拉显示时返回箭头不见了，如下图，请问这个是怎么回事，如何修改呢？谢谢～～～

[ChinaFanny]

在lt_setElementsAlpha方法中，修改“obj.alpha = obj.alpha == 0 ? 0 : alpha”语句为“obj.alpha = alpha”， 可以解决我上述提到的问题，望作者采纳解决～
`- (void)lt_setElementsAlpha:(CGFloat)alpha {
[[self valueForKey:@"_leftViews"] enumerateObjectsUsingBlock:^(UIView *view, NSUInteger i, BOOL *stop) {
view.alpha = alpha;
}];

[[self valueForKey:@"_rightViews"] enumerateObjectsUsingBlock:^(UIView *view, NSUInteger i, BOOL *stop) {
    view.alpha = alpha;
}];

UIView *titleView = [self valueForKey:@"_titleView"];
titleView.alpha = alpha;
// when viewController first load, the titleView maybe nil
[[self subviews] enumerateObjectsUsingBlock:^(UIView *obj, NSUInteger idx, BOOL *stop) {
if ([obj isKindOfClass:NSClassFromString(@"UINavigationItemView")]) {
obj.alpha = alpha;
}
if ([obj isKindOfClass:NSClassFromString(@"_UINavigationBarBackIndicatorView")]) {
//
// Modified by ChinaFanny
// (解决push一个controller后，滑动隐藏导航后再滑动显示时返回按钮<系统自带返回按钮>的箭头消失问题)
//

// obj.alpha = obj.alpha == 0 ? 0 : alpha;
obj.alpha = alpha;
}
}];
}`

[ltebean]

fixed in v2.1.9