如何在uitableview中显示和隐藏数组

Posted 2023-03-03

【中文标题】如何在uitableview中显示和隐藏数组

【英文标题】：How to show and hide array in uitableview

【发布时间】：2012-06-14 18:25:12

【问题描述】：

我试图像这样加载我的Arrays，但它只加载了第一个Array，而其他的没有显示。

    - (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];
    


    

我做错了什么？

另外，我想将数组标题显示为节标题，它是如何做到的 完成了吗？

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;

EDIT2

- (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？

【参考方案1】：

由于您要将它们划分为多个部分，因此您的 tableData 应该是 NSMutableDictionary 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sectionsTitle 和tableData 来填满您的表格 对于表格中的任何部分，您都可以从[sectionsTitle objectAtIndex:sectionIndex]; 获取其标题 要获取部分中的所有元素，请使用 [sectionsTitle objectForKey:[sectionTitle objectAtIndex:sectionIndex]];

【讨论】：

谢谢，看来可以了！你能帮我解决其他问题吗？如何将我的数组（黑色、绿色）设置为部分标题？

当我将 tableData 设置为 NSMutableDictionary 时，我遇到了 ARC 问题“'NSMutableDictionary' 没有可见的@interface 声明选择器 'objectAtIndex:'”

在您的 cellForRow 中，您需要更改以下 NSDictionary *dict = [tableData objectAtIndex:indexPath.row]; cell.textLabel.text = [NSString stringWithFormat:@"%@ - %@", [dict objectForKey:@"Name"], [dict objectForKey:@"Address"]];到 NSDictionary *dict = [tableData objectForKey:[sectionTitle objectAtIndex:indexPath.row]]; cell.textLabel.text = [NSString stringWithFormat:@"%@ - %@", [dict objectForKey:@"Name"], [dict objectForKey:@"Address"]];

好的..我得到了最后一个问题..使用未声明的标识符“sectionIndex”和“sectionTitle”。非常感谢您的帮助！

很高兴:)，如果有用请不要忘记接受答案:)