我是 iOS 开发的新手，我正在尝试构建字典。我的第一个屏幕顶部只有一个搜索栏，TableView下面有一个所有条目。当您在搜索栏中键入时，TableView 将使用匹配的条目进行过滤。当您在全部列表模式或过滤模式下单击任何单元格时，会推送另一个视图，显示单词的名称和定义。
每当我单击表格单元格时，我已经能够打开一个新屏幕，但由于某种原因，新屏幕中的两个标签（单词和定义）不会随着选择而更新——它保持为空. 我想我已经在我的 XIB 文件中正确设置了这两个IBOutlets，因为当我记录 s 的text属性时UILabel，它们会正确打印出来。帮助？
EntryViewController.h（第二个屏幕）：
#import <UIKit/UIKit.h>
@interface EntryViewController : UIViewController
@property (nonatomic, strong) IBOutlet UILabel *word;
@property (nonatomic, strong) IBOutlet UILabel *definition;
@end
入口视图控制器.m：
#import "EntryViewController.h"
@implementation EntryViewController
@synthesize word, definition;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
self.word = [[UILabel alloc] init];
self.definition = [[UILabel alloc] init];
return self;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self.navigationController setNavigationBarHidden:NO];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
UTVTViewController.h（第一个屏幕）：
#import <UIKit/UIKit.h>
#import "EntryViewController.h"
@interface UTVTViewController : UIViewController <UITableViewDataSource, UITableViewDelegate,
UISearchBarDelegate, UISearchDisplayDelegate>
@property (nonatomic, strong) IBOutlet UITableView *sampleTableView;
@property (nonatomic, strong) NSMutableDictionary *entries;
@property (nonatomic, strong) NSMutableArray *sortedWords, *filteredList;
@property (nonatomic) BOOL isSearching;
@property (nonatomic, retain) EntryViewController *entryView;
- (void)filterListForSearchText:(NSString *)searchText;
@end
UTVTViewController.m
#import "UTVTViewController.h"
#import "EntryViewController.h"
@implementation UTVTViewController
@synthesize sampleTableView, entries, sortedWords, filteredList, isSearching, entryView;
- (void)viewDidLoad {
[super viewDidLoad];
entries = [NSMutableDictionary new];
[entries setObject:@"a syndrome of wide spaced eyes (ocular hypertelorism), front-facing (anteverted) nostrils, a broad upper lip, a malformed (\"saddle-bag\") scrotum, and laxity of the ligaments resulting in bending back of the knees (genu recurvatum), flat feet, and overly extensible fingers. There are X-linked and autosomal forms of the disease. The gene for the X-linked form has been mapped to chromosome band Xp11.21 and identified as the FGD1 gene." forKey:@"aarskog-scott syndrome"];
[entries setObject:@"a diminution, decrease or easing. In medicine there may be abatement of pain or any other symptom or sign. In the environment there may abatement in the degree of pollution" forKey:@"abatement"];
[entries setObject:@"a disorder marked by a pathological pattern of alcohol use that causes serious impairment in social or occupational functioning. It includes both alcohol abuse and alcohol dependence." forKey:@"alcoholism"];
// ...other words
sortedWords = [[NSMutableArray alloc] initWithArray:[[entries allKeys] sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)]];
filteredList = [[NSMutableArray alloc] init];
isSearching = NO;
}
// ...
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSString *selection;
if (isSearching && [filteredList count]) {
selection = [filteredList objectAtIndex:indexPath.row];
} else {
selection = [sortedWords objectAtIndex:indexPath.row];
}
EntryViewController *evc = [[EntryViewController alloc] initWithNibName:@"EntryView" bundle:nil];
evc.title = selection;
[evc.word setText:selection];
[evc.definition setText:[entries objectForKey:selection]];
NSLog(@"word=%@", evc.word.text);
NSLog(@"definition=%@", evc.definition.text);
[[self navigationController] pushViewController:evc animated:YES];
}
@end
编辑：我包括 AppDelegate 的头文件和实现文件。我有一种感觉，错误出现在navigationController我目前没有连接到任何东西的地方，但我什至不知道在哪里附加它，因为我的 XIB 中没有。
UTVTAppDelegate.h：
@interface UTVTAppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) UTVTViewController *viewController;
@property (nonatomic, retain) IBOutlet UINavigationController *navigationController;
@end
UTVTAppDelegate.m
@implementation UTVTAppDelegate
@synthesize navigationController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.viewController = [[UTVTViewController alloc] initWithNibName:@"UTVTViewController" bundle:nil];
self.window.rootViewController = self.viewController;
navigationController = [[UINavigationController alloc] initWithRootViewController:self.viewController];
[navigationController setNavigationBarHidden:YES];
[self.window addSubview:navigationController.view];
[self.window makeKeyAndVisible];
return YES;
}
// default Xcode methods
@end