UISearchBar范围栏在iOS7中不可见

Question

使用以下代码，示波器栏不可见（按钮工作但不可见 - 只是黑色空间）

UISearchBar* searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, self.tableView.frame.size.width, 44 + (_showScope?40:0));];
searchBar.barStyle = UIBarStyleBlack;

searchBar.scopeButtonTitles = [NSArray arrayWithObjects:@"string1", @"string2", nil];
searchBar.showsScopeBar = YES;
searchBar.delegate = self;

self.tableView.tableHeaderView = searchBar;

在iOS6中运行良好。有什么想法吗？

Answer 1

这似乎是一种解决方法：

UISearchBar* searchBar = [[UISearchBar alloc] initWithFrame:CGRectZero];
searchBar.barStyle = UIBarStyleBlack;

searchBar.scopeButtonTitles = [NSArray arrayWithObjects:@"string1", @"string2", nil];
searchBar.showsScopeBar = YES;
searchBar.delegate = self;

self.tableView.tableHeaderView = searchBar;

searchBar.frame = CGRectMake(0, 0, self.tableView.frame.size.width, 44 + (_showScope?40:0));

不错！

Answer 2

感谢Nick H247让我走上正轨。但是，他的解决方法为我提出了另一个问题，搜索结果列表显示在搜索栏后面，这样我就无法从列表的开头选择搜索结果。我通过在将UISearchBar分配给tableHeaderView之前设置框架来修复此问题。

UISearchBar* searchBar = [[UISearchBar alloc] initWithFrame:CGRectZero];
searchBar.barStyle = UIBarStyleBlack;

searchBar.scopeButtonTitles = [NSArray arrayWithObjects:@"string1", @"string2", nil];
searchBar.showsScopeBar = YES;
searchBar.delegate = self;

searchBar.frame = CGRectMake(0, 0, self.tableView.frame.size.width, 44 + (_showScope?40:0));

self.tableView.tableHeaderView = searchBar;

Answer 3

简单，调用searchBar.sizeToFit;