如何从 UITableViewController 转到多个视图控制器

Posted 2023-02-23

【中文标题】如何从 UITableViewController 转到多个视图控制器

【英文标题】：How to go from UITableViewController to multiple View Controllers

【发布时间】：2013-11-16 13:34:23

【问题描述】：

我是一名新的 ios 开发人员，当我为 Recipes 制作项目时，我遇到了这个问题，我需要从每个单元格转到一个单独的视图控制器，每个视图控制器都有一组图像，它显示为 UIPageViewController。 这是我在第一个视图控制器上调用的数组 (RecipeViewController)

- (void)viewDidLoad


    [super viewDidLoad];
    // Initialize table data

    Recipe *recipe1 = [Recipe new];
    recipe1.name = @"Egg Benedict";
    recipe1.prepTime = @"30 min";
    recipe1.imageFile = @"egg_benedict.jpg";
    recipe1.ingredients = [NSArray arrayWithObjects:@"2 fresh English muffins", @"4 eggs", @"4 rashers of back bacon", @"2 egg yolks", @"1 tbsp of lemon juice", @"125 g of butter", @"salt and pepper", nil];

    Recipe *recipe2 = [Recipe new];
    recipe2.name = @"Mushroom Risotto";
    recipe2.prepTime = @"30 min";
    recipe2.imageFile = @"mushroom_risotto.jpg";
    recipe2.ingredients = [NSArray arrayWithObjects:@"1 tbsp dried porcini mushrooms", @"2 tbsp olive oil", @"1 onion, chopped", @"2 garlic cloves", @"350g/12oz arborio rice", @"1.2 litres/2 pints hot vegetable stock", @"salt and pepper", @"25g/1oz butter", nil];

    Recipe *recipe3 = [Recipe new];
    recipe3.name = @"Full Breakfast";
    recipe3.prepTime = @"20 min";
    recipe3.imageFile = @"full_breakfast.jpg";
    recipe3.ingredients = [NSArray arrayWithObjects:@"2 sausages", @"100 grams of mushrooms", @"2 rashers of bacon", @"2 eggs", @"150 grams of baked beans", @"Vegetable oil", nil];

    Recipe *recipe4 = [Recipe new];
    recipe4.name = @"Hamburger";
    recipe4.prepTime = @"30 min";
    recipe4.imageFile = @"hamburger.jpg";
    recipe4.ingredients = [NSArray arrayWithObjects:@"400g of ground beef", @"1/4 onion (minced)", @"1 tbsp butter", @"hamburger bun", @"1 teaspoon dry mustard", @"Salt and pepper", nil];

    Recipe *recipe5 = [Recipe new];
    recipe5.name = @"Ham and Egg Sandwich";
    recipe5.prepTime = @"10 min";
    recipe5.imageFile = @"ham_and_egg_sandwich.jpg";
    recipe5.ingredients = [NSArray arrayWithObjects:@"1 unsliced loaf (1 pound) French bread", @"4 tablespoons butter", @"2 tablespoons mayonnaise", @"8 thin slices deli ham", @"1 large tomato, sliced", @"1 small onion", @"8 eggs", @"8 slices cheddar cheese", nil];

    Recipe *recipe6 = [Recipe new];
    recipe6.name = @"Creme Brelee";
    recipe6.prepTime = @"1 hour";
    recipe6.imageFile = @"creme_brelee.jpg";
    recipe6.ingredients = [NSArray arrayWithObjects:@"1 quart heavy cream", @"1 vanilla bean, split and scraped", @"1 cup vanilla sugar", @"6 large egg yolks", @"2 quarts hot water", nil];

    Recipe *recipe7 = [Recipe new];
    recipe7.name = @"White Chocolate Donut";
    recipe7.prepTime = @"45 min";
    recipe7.imageFile = @"white_chocolate_donut.jpg";
    recipe7.ingredients = [NSArray arrayWithObjects:@"3 1/4 cups flour", @"2 teaspoons baking powder", @"1/4 teaspoon salt", @"2 beaten eggs", @"2/3 cup sugar", @"2 ounces melted white chocolate", @"1/2 cup milk", nil];

    Recipe *recipe8 = [Recipe new];
    recipe8.name = @"White Chocolate Mocha";
    recipe8.prepTime = @"5 min";
    recipe8.imageFile = @"starbucks_coffee.jpg";
    recipe8.ingredients = [NSArray arrayWithObjects:@"2/3 cup whole milk", @"6 tablespoons white chocolate chips", @"coffee", @"whipped cream", nil];

    Recipe *recipe9 = [Recipe new];
    recipe9.name = @"Vegetable Curry";
    recipe9.prepTime = @"30 min";
    recipe9.imageFile = @"vegetable_curry.jpg";
    recipe9.ingredients = [NSArray arrayWithObjects:@"1 tablespoon olive oil", @"1 onion, chopped", @"2 cloves garlic", @"2 1/2 tablespoons curry powder", @"2 quarts hot water", nil];

    Recipe *recipe10 = [Recipe new];
    recipe10.name = @"Instant Noodle with Egg";
    recipe10.prepTime = @"8 min";
    recipe10.imageFile = @"instant_noodle_with_egg.jpg";
    recipe10.ingredients = [NSArray arrayWithObjects:@"1 pack of Instant Noodle", @"2 eggs", nil];

    Recipe *recipe11 = [Recipe new];
    recipe11.name = @"Noodle with BBQ Pork";
    recipe11.prepTime = @"20 min";
    recipe11.imageFile = @"noodle_with_bbq_pork.jpg";
    recipe11.ingredients = [NSArray arrayWithObjects:@"1 pack of Instant Noodle", @"BBQ pork", @"Salt and Pepper", nil];

    Recipe *recipe12 = [Recipe new];
    recipe12.name = @"Japanese Noodle with Pork";
    recipe12.prepTime = @"20 min";
    recipe12.imageFile = @"japanese_noodle_with_pork.jpg";
    recipe12.ingredients = [NSArray arrayWithObjects:@"1 pack of Japanese Noodle", @"2 green onions", @"2 garlic cloves, minced", @"4 boneless pork loin chops", nil];

    Recipe *recipe13 = [Recipe new];
    recipe13.name = @"Green Tea";
    recipe13.prepTime = @"5 min";
    recipe13.imageFile = @"green_tea.jpg";
    recipe13.ingredients = [NSArray arrayWithObjects:@"Green tea", nil];

    Recipe *recipe14 = [Recipe new];
    recipe14.name = @"Thai Shrimp Cake";
    recipe14.prepTime = @"1.5 hours";
    recipe14.imageFile = @"thai_shrimp_cake.jpg";
    recipe14.ingredients = [NSArray arrayWithObjects:@"8 oz (250g) peeled and deveined raw shrimp", @"2 tablespoons red curry paste", @"1 large egg", @"2 teaspoon fish sauce", @"1 tablespoon sugar", @"2 tablespoons coconut milk", @"2 tablespoons roughly chopped Thai basil leaves", nil];

    Recipe *recipe15 = [Recipe new];
    recipe15.name = @"Angry Birds Cake";
    recipe15.prepTime = @"4 hours";
    recipe15.imageFile = @"angry_birds_cake.jpg";
    recipe15.ingredients = [NSArray arrayWithObjects:@"12 tablespoons (1 1/2 sticks) unsalted butter", @"2 1/2 cups all-purpose flour", @"1 tablespoon baking powder", @"1 teaspoon salt", @"1 3/4 cups sugar", @"2 large eggs, plus 3 large egg yolks", @"1 cup of milk", nil];

    Recipe *recipe16 = [Recipe new];
    recipe16.name = @"Ham and Cheese Panini";
    recipe16.prepTime = @"10 min";
    recipe16.imageFile = @"ham_and_cheese_panini.jpg";
    recipe16.ingredients = [NSArray arrayWithObjects:@"2 tablespoons unsalted butter", @"4 cups thinly sliced shallots", @"2 teaspoons fresh thyme", @"1/4 cup grainy Dijon mustard", @"8 slices rustic white bread", @"8 slices Gruyere cheese", @"8 ounces sliced cooked ham", nil];

    recipes = [NSArray arrayWithObjects:recipe1, recipe2, recipe3, recipe4, recipe5, recipe6, recipe7, recipe8, recipe9, recipe10, recipe11, recipe12, recipe13, recipe14, recipe15, recipe16, nil];

所以当我按下“Egg Benedict”时，我需要转到带有图像数组的视图控制器，当我选择“Mushroom Ristto”时，转到另一个带有另一个图像数组的视图控制器，依此类推，对于我拥有的每 16 个数组。 我使用prepareForSegue和代码如下

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
if ([segue.identifier isEqualToString:@"themeDetails"]) 
    NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
    ThemeDetailViewController *destViewController = segue.destinationViewController;
    destViewController.theme = [titleLabel objectAtIndex:indexPath.row];

如果这正确或需要修改 我的（`ReciepeViewController.h）如下

@property (nonatomic, strong) ReciepeDetailViewController *reciepeDetailController;

请帮帮我；我在 google 和 youtube 上搜索了很多次，但没有得到任何东西

【问题讨论】：

为什么每次都跳转到不同的视图控制器？改为使用具有动态内容的视图控制器。

你能给我解释一下吗

我现在得走了，但如果我回来没有答案，我可以发一个。

【参考方案1】：

您应该创建一个动态表格视图。

我建议对您的代码进行以下改进：

首先，我将创建一个包含您的食谱的 JSON 文件，该文件将成为应用程序包中的资源文件：

创建一个包含以下内容的文件“recipes.json”：

[
    
        "preparation_time": 30, 
        "image_url": "egg_benedict.jpg", 
        "name": "Egg Benedict", 
        "ingredients": [
            "2 fresh English muffins", 
            "4 eggs", 
            "4 rashers of back bacon", 
            "2 egg yolks", 
            "1 tbsp of lemon juice", 
            "125 g of butter", 
            "salt and pepper"
        ]
    , 
    
        "preparation_time": 30, 
        "image_url": "mushroom_risotto.jpg", 
        "name": "Mushroom Risotto", 
        "ingredients": [
            "1 tbsp dried porcini mushrooms", 
            "2 tbsp olive oil", 
            "1 onion, chopped", 
            "2 garlic cloves", 
            "350g/12oz arborio rice", 
            "1.2 litres/2 pints hot vegetable stock", 
            "salt and pepper", 
            "25g/1oz butter"
        ]
    
]

（注意：我只将您的代码示例中的两个配方放入 JSON 文件）

然后，在 viewDidLoad 中的视图控制器中加载配方并创建一个 JSON 表示，它是一个字典数组：

NSBundle* mainBundle = [NSBundle mainBundle];
NSURL* recipesDataURL = [mainBundle URLForResource:@"recipes" withExtension:@"json"];
if (recipesDataURL) 
    NSData* data = [NSData dataWithContentsOfURL: recipesDataURL];
    if (data) 
        NSError* error;
        NSArray* recipes = [NSJSONSerialization JSONObjectWithData:data 
                                                           options:0 
                                                             error:&error];
        if (recipes == nil) 
            // error: couldn't parse the JSON
            return;
        
        self.recipes = recipes;
    
    else 
        // error: couldn't load the data with the given URL
        return;
    

else 
    // error: couldn't locate the resource in the bundle
    return;

self.recipes 是视图控制器的一个属性，它是一个配方数组 (NSDictionary)。

配方本身就是NSDictionary。如果需要，您可以创建一个专用类 Recipe 并初始化一个配方对象（例如 initWithParameters: 使用包含“参数”的字典。但是，使用 NSDictionary 作为配方对象可能完全足够了。

如果使用动态表格视图，则需要实现一些委托方法。官方文档有更多信息，请查看有关 UITableView 的各种可用主题：UITableView Programming Guide for iOS

基本上，作为一个快速开始，您的 TableViewDataSource 代表将访问数组 self.recipes 以获取 行数 和 recipe 对象的属性建立一个细胞。例如：

UITableViewDataSource 委托：

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
    return [self.recipes count];


- (UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath 

    UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"MyIdentifier"];
    if (cell == nil) 
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle
                                      reuseIdentifier:@"MyIdentifier"];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
    
    NSDictionary* recipe = [self.recipes objectAtIndex:indexPath.row];
    cell.textLabel.text = recipe[@"name];
    return cell;

编辑：

您可以显示详细视图，该视图显示配方的所有详细信息，如其他答案中所示。我建议以下：

您的 Detail View Controller 有一个 recipe 类型为 NSDictionary 的公共属性：

@property (nonatomic, strong) NSDictionary* recipe; 

当您不使用故事板时，您可以按如下方式显示详细视图控制器：

在您的 TableViewController.m 中：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 

    NSDictionary* recipe = [self.recipes objectAtIndex:[indexPath row]];
    ShowRecipeViewController* viewController = (ShowRecipeViewController*)[[ShowRecipeViewController alloc] initWithNibName:@"ShowRecipeViewController" bundle:nil];
    viewController.recipe = recipe;
    [[self navigationController] pushViewController: viewController animated:YES];

不过，我建议使用情节提要。在这种情况下，细节视图控制器将获取prepareForSegue:sender:中设置的属性recipe。

另见：Passing data between View Controllers using Segue

【讨论】：

请告诉我可以为每个视图控制器放置新数组的位置；或者我创建了大约 16 个视图控制器，之后每个视图控制器都有不同的图像数组

你有一个表视图控制器和一个细节视图控制器。表格视图可能只显示配方的名称。如果用户在表格视图中的单元格上按标签，表格视图会创建一个新的ShowRecipeViewController。然后，表格视图将 ShowRecipeViewController 的属性recipe 分配给当前选定的recipe。不久之后，ShowRecipeViewController 将根据其属性recipe 在viewWillAppear 或viewDidLoad 中设置其UI 元素。因此，您只需要详细视图控制器 (ShowRecipeViewController) 的 ONE 类和它的 ONE 实例。

我现在试试这个方法，我会通知你的；但如果您有更多详细信息，请提供给我

我有一个错误 NSArray* recipes = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];可能误认为 &error;那你能解释一下这是否正确吗？

示例中有一个“错误”，我会修复它。然而，与往常一样，“代码示例”只是说明一个概念或解决方案的想法。不要总是期望示例代码——直接在 SO 编辑器中编写——总是可以毫无问题地编译；）上面的问题很容易解决。一分钟...

【参考方案2】：

您有一个更好的选择，请转到单个 ViewController 并根据您的数据使其动态化。但是，当您想为各个数据使用多个 ViewController 时，只需执行以下操作...

在你的Recipe接口中添加一个属性并合成它

@property (nonatomic, retain) UIViewController *MyViewController;

现在在您的 viewDidLoad 方法中执行以下操作

-(void)viewDidLoad

    [super viewDidLoad];
    ObjectHolderArray=[[NSMutableArray alloc] init]; // it's mutable array for holding all the object of recipe which we are going to create

    Recipe *recipe1 = [Recipe new];
    recipe1.name = @"Egg Benedict";
    recipe1.prepTime = @"30 min";
    recipe1.imageFile = @"egg_benedict.jpg";
    recipe1.ingredients = [NSArray arrayWithObjects:@"2 fresh English muffins", @"4 eggs", @"4 rashers of back bacon", @"2 egg yolks", @"1 tbsp of lemon juice", @"125 g of butter", @"salt and pepper", nil];
    recipe1.MyViewController=[[eggBenedictViewController alloc] init]; //set your respective viewController
    [ObjectHolderArray addObject:recipe1]; // add your object to your array

    Recipe *recipe2 = [Recipe new];
    recipe2.name = @"Mushroom Risotto";
    recipe2.prepTime = @"30 min";
    recipe2.imageFile = @"mushroom_risotto.jpg";
    recipe2.ingredients = [NSArray arrayWithObjects:@"1 tbsp dried porcini mushrooms", @"2 tbsp olive oil", @"1 onion, chopped", @"2 garlic cloves", @"350g/12oz arborio rice", @"1.2 litres/2 pints hot vegetable stock", @"salt and pepper", @"25g/1oz butter", nil];\
    recipe1.MyViewController=[[mushroomRisottoViewController alloc] init]; //set your respective viewController
    [ObjectHolderArray addObject:recipe2]; // add your object to your array
   // and so on

现在在 didSelectRowAtIndexPath 中执行以下操作

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 

   Recipe *recipeObject=[ObjectHolderArray objectAtIndex:[indexpath row]]; //get the selected recipe object

   UIViewController *myController=(UIViewController *)[recipeObject MyViewController];
   // Now you have your respective viewcotroller and also all the required data for going to next viewController
  // then what you are waiting for? simply push your viewcontroller

【讨论】：

我知道我会用我将在不同的 viewController 上创建的数组替换 objectHolderArray；所以在那之后我必须在 viewdidload 上写下所有的数组

这并不意味着你已经在viewDidLoad上写了所有的数组。但是在调用 table view deligates 方法之前，你必须填充你的数组。

所以在调用之前我会在 eggBenedictViewController 和蘑菇RisottoViewController 上创建数组；对吗？

是的，您必须在调用它们之前准备好您的视图控制器。

我的详细视图有 uipageviewcontroller 所以objectHolderArray 将被更改为不同viewController 内的数组名称；我是对的？