所以我一整天都在寻找，我修了一些，但仍然无法展示。所以，这是交易：
我已经开始写Xcode 3天了，我正在跟踪斯坦福大学的在线讲座，所以代码看起来像是讲座代码。虽然几乎与讲义相同，但我的代码无法显示从互联网上获取的单词。目的是建立一个字典，如果我能够在我的模拟设备iPhone 6上看到这些文字，我将继续写作。
我无法理解的是，我向窗口发送消息并说它采取导航控制器，我在其中推送了WordListViewController（你可以在下面的代码中看到，在AppDelegate.m段中）。
您可以在下面找到我的代码：
WordListTableViewController.h
//
// WordListTableViewController.h
// Vocabulous
//
// Created by user30357 on 6/19/15.
// Copyright (c) 2015 user30357. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface WordListTableViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>{
NSMutableDictionary *words;
NSArray *sections;
}
@end
WordListTableViewController.m
//
// WordListTableViewController.m
// Vocabulous
//
// Created by user30357 on 6/19/15.
// Copyright (c) 2015 user30357. All rights reserved.
//
#import "WordListTableViewController.h"
@interface WordListTableViewController ()
@property (nonatomic, retain) NSMutableDictionary *words;
@property (nonatomic, retain) NSArray *sections;
@end
@implementation WordListTableViewController
@synthesize words, sections;
- (NSMutableDictionary *) words{
if(!words){
NSURL *wordsURL = [NSURL URLWithString:@"http://cs193p.stanford.edu/vocabwords.txt"];
words = [[NSMutableDictionary dictionaryWithContentsOfURL:wordsURL] retain];
}
return words;
}
- (NSArray *) sections{
if(!sections){
sections = [[[self.words allKeys] sortedArrayUsingSelector:@selector(compare:)] retain];
}
return sections;
}
- (void)viewDidLoad {
[super viewDidLoad];
// Uncomment the following line to preserve selection between presentations.
// self.clearsSelectionOnViewWillAppear = NO;
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)dealloc{
[words release];
[sections release];
[super dealloc];
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// Return the number of sections.
return self.sections.count;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// Return the number of rows in the section.
NSArray *wordsInSection = [self.words objectForKey:[self.sections objectAtIndex:section]];
return wordsInSection.count;
}
- (NSString *) wordAtIndexPath:(NSIndexPath *) indexPath{
NSArray *wordsInSection = [self.words objectForKey:[self.sections objectAtIndex:indexPath.section]];
return [wordsInSection objectAtIndex:indexPath.row];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSString *identifier = @"WordListTableViewCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
if(cell == nil)
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
// Configure the cell...
cell.textLabel.text = [self wordAtIndexPath:indexPath];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
return cell;
}
/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
// Return NO if you do not want the specified item to be editable.
return YES;
}
*/
/*
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source
[tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
} else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
*/
/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath {
}
*/
/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
// Return NO if you do not want the item to be re-orderable.
return YES;
}
*/
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
@end
AppDelegate.h
//
// AppDelegate.h
// Vocabulous
//
// Created by user30357 on 6/19/15.
// Copyright (c) 2015 user30357. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@end
AppDelegate.m
//
// AppDelegate.m
// Vocabulous
//
// Created by user30357 on 6/19/15.
// Copyright (c) 2015 user30357. All rights reserved.
//
#import "AppDelegate.h"
#import "WordListTableViewController.h"
@interface AppDelegate ()
@end
@implementation AppDelegate
@synthesize window;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
WordListTableViewController *wltvc = [[WordListTableViewController alloc] init];
UINavigationController *nav = [[UINavigationController alloc] init];
[nav pushViewController:wltvc animated:NO];
[wltvc release];
[window addSubview:nav.view];
[window makeKeyAndVisible];
return YES;
}
- (void)applicationWillResignActive:(UIApplication *)application {
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}
- (void)applicationDidEnterBackground:(UIApplication *)application {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}
- (void)applicationWillEnterForeground:(UIApplication *)application {
// Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}
- (void)applicationDidBecomeActive:(UIApplication *)application {
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}
- (void)applicationWillTerminate:(UIApplication *)application {
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}
@end
我所有的4个班级。此外，我的故事板有WordListTableViewController类，因为我删除了ViewController。
希望你能帮助我解决这个问题，因为我真的要变得疯狂了！
谢谢你们！
答案 0 :(得分：1)
您没有初始化窗口。这是我启动项目的方法改变它。
在 AppDelegate.h
中@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) UINavigationController *navigator;
和@synthesize他们。
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window=[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
LoginViewController *controller=[[LoginViewController alloc] init];
navigator = [[UINavigationController alloc] initWithRootViewController:controller];
[self.window setRootViewController:navigator];
[self.window makeKeyAndVisible];
// Override point for customization after application launch.
return YES;
}