ios - UINavigationBar 和 UISearchBar 之间的小差距

Question

我以编程方式向我的应用程序添加了一个 UISearch，并且在界面生成器中添加了 UINavigation 栏。当我添加搜索栏时，它在搜索栏和导航栏之间留下了一个小间隙。有没有办法将它们合并在一起？谢谢。

self.searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0.0, 0.0,    self.view.bounds.size.width, 44.0)];
self.searchBar.delegate = self;
self.searchBar.autoresizingMask = UIViewAutoresizingFlexibleWidth;
self.searchBar.showsCancelButton = NO;
[self.view addSubview:self.searchBar];

Answer 1

如果确保 SearchBar 位于导航栏的正下方，我将使用自动布局，如下所示:

self.searchBar = [[UISearchBar alloc] init];
self.searchBar.translatesAutoresizingMaskIntoConstraints = NO;
self.searchBar.delegate = self;
self.searchBar.showsCancelButton = NO;
[self.view addSubview:self.searchBar];

id topLayoutGuide = self.topLayoutGuide;
UISearchBar *searchBar = self.searchBar; //updated

[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[searchBar]|" options:0 metrics:0 views:NSDictionaryOfVariableBindings(searchBar)]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[topLayoutGuide][searchBar]" options:0 metrics:0 views:NSDictionaryOfVariableBindings(searchBar, topLayoutGuide)]];

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编辑:

我查了一下，发现这不是一个间隙。苹果公司用它来划分事物的位置。您可以使用多种选择

1.) 搜索并销毁 - 找到 UIImageView，并将其从栏中删除。
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2.) 为您的栏设置自定义背景

[self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.shadowImage = [UIImage new];