ios 以编程方式将 UISearchBar 添加到 UITableView 不起作用
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Add UISearchBar to UITableView programmatically not working
提问by Agamemnon
Background:I have a UIViewControllerthat, when loads, has a UITableViewgenerated programmatically that gets its data from an SQLite3database. This works fine.
背景：我有一个UIViewController，当加载时，有一个UITableView以编程方式生成的，可以从SQLite3数据库中获取数据。这工作正常。
Problem:I need to add a UISearchBar(and associated logic) but when I try, the UISearcBar is not rendered.
问题：我需要添加一个UISearchBar（和相关的逻辑）但是当我尝试时，UISercBar 没有呈现。
Code so far:
到目前为止的代码：
.h file:
.h 文件：
#import <UIKit/UIKit.h>
#import "sqlite3.h"
#import "Exhibitor.h"
@interface ExhibitorViewController : UIViewController <UITableViewDataSource, UITableViewDelegate, UISearchBarDelegate, UISearchDisplayDelegate>
{
sqlite3 *congressDB;
NSMutableArray *searchData;
UISearchBar *searchBar;
UISearchDisplayController *searchDisplayController;
}
@property (strong, nonatomic) IBOutlet UITableView *tableView;
-(NSString *) filePath;
-(void)openDB;
@end
.m file where the UISearchBar is added:
添加 UISearchBar 的 .m 文件：
-(void)loadTableView
{
CGRect usableSpace = [[UIScreen mainScreen] applicationFrame];
CGFloat usableWidth = usableSpace.size.width;
CGFloat usableHeight = usableSpace.size.height;
UITableView *tableView = [[UITableView alloc] init];
[tableView setFrame:CGRectMake(0,0,usableWidth, usableHeight)];
tableView.dataSource = self;
tableView.delegate = self;
[self.view addSubview:tableView];
searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, 320, 64)];
searchDisplayController = [[UISearchDisplayController alloc] initWithSearchBar:searchBar contentsController:self];
searchDisplayController.delegate = self;
searchDisplayController.searchResultsDataSource = self;
self.tableView.tableHeaderView = searchBar; // I think this should have loaded the searchBar but doesn't
// [self.tableView setTableHeaderView:searchBar]; // Have also tried this
// [self.tableView.tableHeaderView addSubview:searchBar]; // And this
NSLog(@"searchBar = %@", searchBar); // This shows the searchBar is an object with values
NSLog(@"HeaderView = %@", self.tableView.tableHeaderView); // This shows the tableHeaderView as null ??
}
What am I doing wrong? What do I need to do to add a UISearchBarprogrammatically to a UITableViewwithin a UIVewController?
我究竟做错了什么？我需要做什么才能以UISearchBar编程方式将 a添加到 aUITableView中UIVewController？
回答by jjv360
You should use a UITableViewControllerinstead...
你应该UITableViewController改用...
.h
。H
@interface ExhibitorViewController : UITableViewController <UISearchBarDelegate, UISearchDisplayDelegate> {
sqlite3 *congressDB;
NSMutableArray *searchData;
UISearchBar *searchBar;
UISearchDisplayController *searchDisplayController;
}
-(NSString *) filePath;
-(void)openDB;
@end
.m
.m
-(void)loadTableView {
searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, 320, 64)];
searchDisplayController = [[UISearchDisplayController alloc] initWithSearchBar:searchBar contentsController:self];
searchDisplayController.delegate = self;
searchDisplayController.searchResultsDataSource = self;
self.tableView.tableHeaderView = searchBar;
}
The problem is you were creating a table view but not assigning it to the property, and using UITableViewControllermakes things much simpler anyway...
问题是你正在创建一个表视图但没有将它分配给属性，UITableViewController无论如何使用会使事情变得更简单......
If you want to keep it the way it is now, then you could just put self.tableView = tableVew;after [self.view addSubview:tableView];...
如果你想保持它的方式是现在，那么你可以只是把self.tableView = tableVew;后[self.view addSubview:tableView];...
回答by Avt
The problem is that
问题是
self.tableView
in loadTableView is nil or it is not that table that you have created programmatically.
在 loadTableView 中为 nil 或者它不是您以编程方式创建的那个表。
Add
添加
self.tableView = tableView;
after
后
[self.view addSubview:tableView];
Without this your searchBar is added to invalid tableView.
如果没有这个，您的 searchBar 将被添加到无效的 tableView。
should
应该
