ios - 如何在uitableview中显示和隐藏数组

Question

我试图Array像这样加载我的 s，但它只是先加载，Array而其他的则不显示。

    - (void)viewDidLoad {
    [super viewDidLoad];


    NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
    NSString *path = [[documentPaths lastObject] stringByAppendingPathComponent:@"test.plist"];

    NSDictionary *myDict = [NSDictionary dictionaryWithContentsOfFile:path];



    if ([[NSUserDefaults standardUserDefaults] boolForKey:@"blackKey"])
    {
        NSArray *black = [myDict objectForKey:@"Black"];
        self.tableData = [black copy];
    }
    else if ([[NSUserDefaults standardUserDefaults] boolForKey:@"greenKey"])
    {
        NSArray *green = [myDict objectForKey:@"Green"];
        self.tableData = [green copy];
    }
    else if ([[NSUserDefaults standardUserDefaults] boolForKey:@"purpleKey"])
    {
        NSArray *purple = [myDict objectForKey:@"Purple"];
        self.tableData = [purple copy];
    }
    else if ([[NSUserDefaults standardUserDefaults] boolForKey:@"orangeKey"])
    {
    NSArray *orange = [myDict objectForKey:@"Orange"];
        self.tableData = [orange copy];
    }
    else if ([[NSUserDefaults standardUserDefaults] boolForKey:@"blueKey"])
    {
        NSArray *blue = [myDict objectForKey:@"Blue"];
        self.tableData = [blue copy];
    }
    else if ([[NSUserDefaults standardUserDefaults] boolForKey:@"redKey"])
    {
        NSArray *red = [myDict objectForKey:@"Red"];
        self.tableData = [red copy];
    }
    else if ([[NSUserDefaults standardUserDefaults] boolForKey:@"darkblueKey"])
    {
        NSArray *darkblue = [myDict objectForKey:@"Darkblue"];
        self.tableData = [darkblue copy];
    }
    else if ([[NSUserDefaults standardUserDefaults] boolForKey:@"yellowKey"])
    {
        NSArray *yellow = [myDict objectForKey:@"Yellow"];
        self.tableData = [yellow copy];
    }


    }

1. 我做错了什么？

2. 另外，我想将数组标题显示为部分标题，怎么做？

3. 有没有办法限制每个部分的行数（我的数组）？

编辑

// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return [tableData 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];
    }

    NSDictionary *dict = [tableData objectAtIndex:indexPath.row];
    cell.textLabel.text = [NSString stringWithFormat:@"%@ - %@", [dict objectForKey:@"Name"], [dict objectForKey:@"Address"]];

    return cell;
}

编辑2

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
    [sectionsTitle objectForKey:[sectionTitle objectAtIndex:indexPath.section]];
}

使用未声明的标识符“indexPath”；你的意思是“NSIndexPath”吗？

Answer 1

由于您要将它们划分为部分，因此您的 tableData 应该是NSMutableDictionary 而且您还需要保存字典的键数组 像这样

NSMutableDictionary *resultDic = [[NSMutableDictionary alloc] init];
NSMutableArray *resultArray = [[NSMutableArray alloc] init];
NSDictionary *myDict = [NSDictionary dictionaryWithContentsOfFile:path];
if ([[NSUserDefaults standardUserDefaults] boolForKey:@"blackKey"])
{
    NSArray *black = [myDict objectForKey:@"Black"];

    //Add the key here
    [resultArray addObject:@"Black"];
    //Add the key and value
    [resultDic setValue:black forKey:@"Black"];
}
else if ([[NSUserDefaults standardUserDefaults] boolForKey:@"greenKey"])
{
    NSArray *green = [myDict objectForKey:@"Green"];

    //Add the key here
    [resultArray addObject:@"Green"];
    //Add the key and value
    [resultDic setValue:black forKey:@"Green"];
}
//Repeat for all the elements
....
//Then after you finished all the tests and additions

//Assign the result array to your tableData
self.tableData = resultDic;
self.sectionsTitle = resultArray;

现在使用sectionsTitleandtableData来填充表格对于表格中的任何部分，您可以从中获取其标题[sectionsTitle objectAtIndex:sectionIndex]; 要获取部分中的所有元素，请使用[sectionsTitle objectForKey:[sectionTitle objectAtIndex:sectionIndex]];