1. iOS 14 popToRootViewControllerAnimated 底部tabbar消失
iOS14 missing TabBar on popping multiple ViewControllers
Seems like there is a confirmed bug on Xcode12 + iOS14.
I have a UINavigationController on each item of a UITabBar, and I've set hidesBottomBarWhenPushed to YES on every secondary ViewControllers, so the TabBar will only be shown on the rootViewController of navigationController. But when I try popping multiple ViewControllers, like pop C from stacks like A-B-C, I found that the TabBar just missing on A.
Also another weird part, when I print navigationController.viewControllers in viewWillDisappear: method on C, I found it printing like "C-A". How C moved to the top of the array??
This is confirmed on a simple demo app, wonder when it will be fixed.
https://developer.apple.com/forums/thread/660750
修改方法：
- (NSArray<kindof UIViewController *> *)popToRootViewControllerAnimated:(BOOL)animated {
if (self.viewControllers.count > 1) {
self.topViewController.hidesBottomBarWhenPushed = NO;
}
NSArray<kindof UIViewController *> *viewControllers = [super popToRootViewControllerAnimated:animated];
// self.viewControllers has two items here on iOS14
return viewControllers;
}
或者
[UINavigationController popToRootViewControllerAnimated:NO]
该问题在iOS 14.2中已修复。
2. UIDatePicker
preferredDatePickerStyle = UIDatePickerStyleWheels
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iPhone屏幕尺寸、statusBar、navigationBar、tabBar高度对比
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iOS14推荐使用
[cell.contentView addSubview:];
方式添加控件。
因为UITableViewCell中使用
[cell addSubview:]
方式添加的控件，会显示在contentView的下层，控件会被contentView遮挡并无法响应交互事件。
搜索的时候使用search scope会更方便。
Xcode上手之搜索功能 https://blog.csdn.net/weixin_42414576/article/details/103971926
