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UISearch，并在界面构建器中添加了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小的空白。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

如果正下方的导航栏确保搜索栏是，我会使用自动布局像这样：

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：

我做了一些搜索，发现它不是一个缺口。这是苹果用来将事物划分到位的形象。有很多选择你可以接近

1.）搜索并销毁 - 找到UIImageView，并将其从你的栏中删除。
Remove UIToolbar hairline in iOS 7

2）你吧

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