UINavigationBar和UISearchBar之間的小差距

Question

我以編程方式向我的應用程序添加了UISearch，並在界面構建器中添加了UINavigation欄。當我添加搜索欄時，它在搜索欄和導航欄之間留下了一個小小的空白。有沒有辦法將它們合併在一起？謝謝。

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

如果正下方的導航欄確保搜索欄是，我會使用自動佈局像這樣：

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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編輯：

我做了一些搜索，發現它不是一個缺口。這是蘋果用來將事物劃分到位的形象。有很多選擇你可以接近

1.）搜索並銷燬 - 找到UIImageView，並將其從你的欄中刪除。
Remove UIToolbar hairline in iOS 7

2）你吧

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