objective-c - 如何根据他们选择的上一个 View 中的哪个单元格自定义用户看到的 UITableView？

Question

我有一个基于导航的 iOS 应用程序。在我的 RootViewController ，用户会看到从 1 到 18 的章节。当他们选择一个单元格时，它会将他们带到 VersesViewController ，在那里他们看到了从第 1 节到其他任何内容的另一个列表。根据他们选择的章节，他们会看到不同数量的经文。

我想修改 NSArray 的内容在 VersesViewController当用户在 RootViewController 中选择一个单元格时看法。我怎样才能做到这一点？

这里是 RootViewController代码:

#import "RootViewController.h"

@implementation RootViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.title = @"Chapters";
    chapterList = [[NSMutableArray alloc] init];
    for (int i = 1; i<19; i++)
    {
       [chapterList addObject:[NSString stringWithFormat:@"Chapter %d", i]];
    }

}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [chapterList count];
}

// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }

    cell.textLabel.text = [chapterList objectAtIndex:indexPath.row];

    return cell;
}

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

    VersesViewController *detailViewController = [[VersesViewController alloc] initWithNibName:@"VersesViewController" bundle:nil];

    if ([[chapterList objectAtIndex:indexPath.row] isEqual:@"Chapter 9"]) {
  [detailViewController setNumberOfVerses:18];
} else {
  [detailViewController setNumberOfVerses:72];
}
    [self.navigationController pushViewController:detailViewController animated:YES];
    [detailViewController release];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    self.title = nil;
}

- (void)dealloc
{
    [super dealloc];
    [chapterList release];
}

@end

请注意，我是 Obj-C 的 n00b，所以我需要非常简单的答案。谢谢。

Answer 1

您需要更复杂的数据存储。您可以制作字典数组来描述所有章节的数据。

- (void)viewDidLoad
{
    chapterList = [[NSMutableArray alloc] init];
    ...
    chapterInfo = [NSDictionary dictionaryWithObjectsAndKeys:@"Chapter 9", @"title", [NSNumber numberWithInt:18], @"numberOfVerses", nil];
    [chapterList addObject:chapterInfo];
    chapterInfo = [NSDictionary dictionaryWithObjectsAndKeys:@"Chapter 10", @"title", [NSNumber numberWithInt:72], @"numberOfVerses", nil];
    [chapterList addObject:chapterInfo];
    ...
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }

    NSDictionary *chapterInfo = [chapterList objectAtIndex:indexPath.row];
    cell.textLabel.text = [chapterInfo objectForKey:@"title"];

    return cell;
}

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

    VersesViewController *detailViewController = [[VersesViewController alloc] initWithNibName:@"VersesViewController" bundle:nil];

    NSDictionary *chapterInfo = [chapterList objectAtIndex:indexPath.row];
    [detailViewController setNumberOfVerses:[[chapterInfo objectForKey:@"numberOfVerses"] intValue]];
    [self.navigationController pushViewController:detailViewController animated:YES];
    [detailViewController release];
}

最好的方法是创建包含所有章节描述的 plist 文件，然后像这样加载它:

NSString *path = [[NSBundle mainBundle] pathForResource:@"chapters" ofType:@"plist"];
NSArray *chaptersList = [[NSArray alloc] initWithContentsOfFile:path];