1、presentViewController出来的页面，默认是卡片样式的，可以下滑移除，如果不想使用卡片模式，可以通过self.modalPresentationStyle = UIModalPresentationFullScreen;的方式进行修改，具体可查看 https://juejin.im/post/5d00af64e51d455d88219ee2
2、iOS 13增加了暗黑模式，如果想要对其进行自己的定义，可以修改UIUserInterfaceStyle来限制
| Value of key | User’s dark appearance setting | Trait used for app UI | Description |
|---|---|---|---|
"Automatic" |
Off | UIUserInterfaceStyleLight |
Respects the systemwide setting; uses light appearance |
"Automatic" |
On | UIUserInterfaceStyleDark |
Respects the systemwide setting; uses dark appearance |
"Light" |
(ignored) | UIUserInterfaceStyleLight |
Always uses light appearance |
"Dark" |
(ignored) | UIUserInterfaceStyleDark |
Always uses dark appearance |
(key not present in Info.plist file, or incorrect value) |
(ignored) | UIUserInterfaceStyleLight |
Always uses light appearance |
内容来源：https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/iPhoneOSKeys.html#//apple_ref/doc/uid/TP40009252-SW44
3、OS13系统不让 KVC 的方式 来取或修改私有属性，比如通过- (void)setValue:(nullable id)value forKeyPath:(NSString *)keyPath
设置私有属性和 - (nullable id)valueForKeyPath:(NSString *)keyPath; 获取私有属性
4、 修改兼容iOS 13后，因为不能用kvc的方式修改私有属性，所以UISearchbar的placeholder颜色不能用老的方式进行修改，新的修改方式可参考http://yoferzhang.com/post/20190604Searchbarios13/
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