TableView SearchController未显示在屏幕顶部

Question

我创建了一个简单的tableView并设置了一个searchController。我需要我的tableview y点以70px开头。当我触摸searchBar时，它没有在屏幕顶部显示打开的栏。相反，它从70px略微上升。

我不熟悉swift或storyboard。我想使用客观的c语言。

方法：viewDidLoad中

cateArray_ = [ [ NSArray alloc ] initWithObjects:@"Apple", @"Fruits", @"Vegetables", @"1", @"350", @"Shell", @"Stocks", @"Numbers", nil ];

self.tableView_ = [ [ UITableView alloc ] initWithFrame:CGRectMake(0, 70, self.view.frame.size.width, self.view.frame.size.height - 70 ) style:UITableViewStylePlain ];
self.tableView_.delegate = self;    
self.tableView_.dataSource = self;    
self.tableView_.bounces = YES;    
self.tableView_.alwaysBounceVertical = YES;    
UIView* footerToRemoveBorderLine = [ [ UIView alloc ] initWithFrame:CGRectZero ];   
self.tableView_.tableFooterView = footerToRemoveBorderLine;  
self.tableView_.backgroundColor = [ UIColor colorWithRed:1.0 green:0.95 blue:0.95 alpha:1.0 ];    
self.tableView_.contentOffset = CGPointMake(0, 44);   
[ self.view addSubview:self.tableView_ ];  
[ self setTitle:@"Category" ];

//Search controller
self.searchCtrl_ = [ [ UISearchController alloc ] initWithSearchResultsController:nil ];   
[ self.searchCtrl_ setDimsBackgroundDuringPresentation:false ];   
[ self.searchCtrl_.searchBar sizeToFit ];  
[ self.searchCtrl_ setSearchResultsUpdater:self ];  
[ self.searchCtrl_.searchBar setBarStyle:UIBarStyleDefault ]; 
[ self.searchCtrl_.searchBar setAutocorrectionType:UITextAutocorrectionTypeNo ];
[ self.searchCtrl_.searchBar setDelegate:self ];
[ self.searchCtrl_.searchBar setScopeButtonTitles:[ NSArray arrayWithObjects:@"All", @"Alpha", @"Numbers", nil ] ];
self.tableView_.tableHeaderView = self.searchCtrl_.searchBar;

方法搜索代理

- (void)searchBar:(UISearchBar *)searchBar selectedScopeButtonIndexDidChange:(NSInteger)selectedScope
{
    [ self updateSearchResultsForSearchController:self.searchCtrl_ ];
}  

// Called when the search bar becomes first responder
- (void)updateSearchResultsForSearchController:(UISearchController *)searchController
{
    // Set searchString equal to what's typed into the searchbar
    NSString* searchString = [ self.searchCtrl_.searchBar text ];
    NSString* scope = [ [ self.searchCtrl_.searchBar scopeButtonTitles ] objectAtIndex:[ self.searchCtrl_.searchBar selectedScopeButtonIndex ] ];    
    [ self filterContentForSearchText:searchString Scope:scope ];
}

当我通过点击打开searchBar时，它会在打开时稍微移动搜索的灰色部分。但我希望它位于状态栏的顶部或下方。

有人可以帮助我解决我做错了什么或者有什么工作吗？

我需要tableView的table y点从70开始，因为上面的表视图我将保留一些范围栏和文本。

原谅我的英语不好，非常感谢你的帮助。

Answer 1

//try the below code
#import "ViewController.h"

@interface ViewController ()
{
    UITableView*tableView_;
    UISearchController*searchCtrl_;
}

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    tableView_ = [ [ UITableView alloc ] initWithFrame:CGRectMake(0, 20, self.view.frame.size.width, self.view.frame.size.height) style:UITableViewStylePlain ];
    //tableView_.delegate = self;
    //tableView_.dataSource = self;
    tableView_.bounces = YES;
    tableView_.alwaysBounceVertical = YES;
    UIView* footerToRemoveBorderLine = [ [ UIView alloc ] initWithFrame:CGRectZero ];
    tableView_.tableFooterView = footerToRemoveBorderLine;
    tableView_.backgroundColor = [ UIColor colorWithRed:1.0 green:0.95 blue:0.95 alpha:1.0 ];
    tableView_.contentOffset = CGPointMake(0, 0);
    [ self.view addSubview:tableView_ ];
    [ self setTitle:@"Category" ];

    //Search controller
    searchCtrl_ = [ [ UISearchController alloc ] initWithSearchResultsController:nil ];
    [ searchCtrl_ setDimsBackgroundDuringPresentation:false ];
    [ searchCtrl_.searchBar sizeToFit ];
    [ searchCtrl_ setSearchResultsUpdater:self ];
    [ searchCtrl_.searchBar setBarStyle:UIBarStyleDefault ];
    [ searchCtrl_.searchBar setAutocorrectionType:UITextAutocorrectionTypeNo ];
    [ searchCtrl_.searchBar setDelegate:self ];
    [ searchCtrl_.searchBar setScopeButtonTitles:[ NSArray arrayWithObjects:@"All", @"Alpha", @"Numbers", nil ] ];
    tableView_.tableHeaderView = searchCtrl_.searchBar;
}