iOS13下 cyl_tabImageView 获取存在问题，可能无法获取

[cwwise]

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Base Info for this issue

UIControl+CYLTabBarControllerExtention 中 cyl_tabImageView

1. Version：Latest Version as v1.21.x
2. Language of App ：Objective-C
3. iOS System Version：iOS13
4. Prototype（是否是真机）：NO
5. Issue Type：Crash、Bug、Enhancement（希望能支持一个新需求）、Q-A
   Bug

1. How to reproduce the problem.

在工程demo MainTabBarController.h中

- (void)tabBarController:(UITabBarController *)tabBarController didSelectControl:(UIControl *)control 
  这个地方代码
 animationView = [control cyl_tabImageView];

如果当前 TabbarItem 是选中状态 点击之后可以获取 animationView，如果当前TabbarItem是未选中状态 点击获取到animationView 值为nil，在iOS12上表现正常。

2. Please help me in this way.

应该都能获取到才是正常的。在iOS12下都可以正常获取到

3. Here is a Demo.

最新版本上就可以复现

4. Here is my Debug log

iOS13下
- (UIImageView *)cyl_tabImageView {
    for (UIImageView *subview in self.subviews) {
        if ([subview cyl_isTabImageView]) {
            return (UIImageView *)subview;
        }
    }
    return nil;
}

当前未选中的情况
(lldb) po self.subviews
<__NSArrayM 0x6000026de130>(
<UIVisualEffectView: 0x7fe6054956c0; frame = (0 0; 93.75 48); userInteractionEnabled = NO; layer = <CALayer: 0x6000028962a0>> clientRequestedContentView effect=<UIVibrancyEffect: 0x600002a3ce30> style=UIBlurEffectStyleSystemChromeBackground vibrancyStyle=_UIVibrancyEffectStyleFill,
<LOTAnimationView: 0x7fe605547220; frame = (29.6667 7; 22 22); userInteractionEnabled = NO; layer = <CALayer: 0x600002875fc0>>
)

当前选中的情况
(lldb) po self.subviews
<__NSArrayM 0x6000026d9ce0>(
<UIVisualEffectView: 0x7fe6054956c0; frame = (0 0; 93.75 48); userInteractionEnabled = NO; layer = <CALayer: 0x6000028962a0>> clientRequestedContentView effect=<UIVibrancyEffect: 0x600002a3ce30> style=UIBlurEffectStyleSystemChromeBackground vibrancyStyle=_UIVibrancyEffectStyleFill,
<LOTAnimationView: 0x7fe605547220; frame = (29.6667 7; 22 22); userInteractionEnabled = NO; layer = <CALayer: 0x600002875fc0>>,
<UITabBarSwappableImageView: 0x7fe6054954d0; frame = (29.6667 7; 22 22); hidden = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x600002896240>>,
<UITabBarButtonLabel: 0x7fe605495230; frame = (30.3333 30.6667; 20.6667 12); text = '首页'; opaque = NO; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x600000ba93b0>>
)

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[ChenYilong]

这个问题在看了，有什么好的建议欢迎加微信聊chenyilong1010

现在请暂时通过下面的方式解决：
这Demo中：

- (void)customizeTabBarAppearance:(CYLTabBarController *)tabBarController {

添加如下代码：

    if (@available(iOS 13.0, *)) {
        [UITabBar appearance].barTintColor = [UIColor whiteColor];// or other color
    }

或者：

   [[UITabBar appearance] setBackgroundImage:[[self class] imageWithColor: [UIColor whiteColor] size:CGSizeMake([UIScreen mainScreen].bounds.size.width, tabBarController.tabBarHeight ?: (CYL_IS_IPHONE_X ? 65 : 40))]];

或者：

if (@available(iOS 10.0, *)) {
     [[UITabBar appearance] setUnselectedItemTintColor:[UIColor grayColor]];
    }

[ChenYilong]

除了上述的办法，也可以直接升级到 v1.27.0，详情见：

#386