ios - 嵌套NSArray的UITableView中的不同节标题

我正在尝试学习如何对UITableView进行编码，并且对该节的编程存在一些问题。

我用字符串声明了3个数组，并用3个数组声明了1个数组。

firstSection = [NSArray arrayWithObjects:@"Red", @"Blue", nil];
secondSection = [NSArray arrayWithObjects:@"Orange", @"Green", @"Purple", nil];
thirdSection = [NSArray arrayWithObject:@"Yellow"];

array = [[NSMutableArray alloc] initWithObjects:firstSection, secondSection, thirdSection, nil];

显示标题

-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{

NSString * title;
title = [NSString stringWithFormat:@"%@" , [array objectAtIndex:section]];

return title;
}

这将数组本身显示为标题

因此，是否有可能使用诸如firstSection和secondSection之类的数组的名称实际显示节的名称？

最佳答案

就您而言，最好将数组存储在NSDictionary中。例如，如果您声明并合成了一个名为NSDictionary的tableContents变量和一个名为NSArray的titleOfSections，则可以执行以下操作:

 - (void)viewDidLoad {
    [super viewDidLoad];

    //These will automatically be released. You won't be needing them anymore (You'll be accessing your data through the NSDictionary variable)
    NSArray *firstSection = [NSArray arrayWithObjects:@"Red", @"Blue", nil];
    NSArray *secondSection = [NSArray arrayWithObjects:@"Orange", @"Green", @"Purple", nil];
    NSArray *thirdSection = [NSArray arrayWithObject:@"Yellow"];

    //These are the names that will appear in the section header
    self.titleOfSections = [NSArray arrayWithObjects:@"Name of your first section",@"Name of your second section",@"Name of your third section", nil];

    NSDictionary *temporaryDictionary = [[NSDictionary alloc]initWithObjectsAndKeys:firstSection,@"0",secondSection,@"1",thirdSection,@"2",nil];
    self.tableContents = temporaryDictionary;
    [temporaryDictionary release];
}

然后在表格中查看控制器的方法:

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    return [self.titleOfSections count];
}
- (NSInteger)tableView:(UITableView *)table numberOfRowsInSection:(NSInteger)section {
    return [[self.tableContents objectForKey:[NSString stringWithFormat:@"%d",section]] count];
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
    //Setting the name of your section
    return [self.titleOfSections objectAtIndex:section];
}

然后在cellForRowAtIndexPath方法中访问每个数组的内容:

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

    NSArray *arrayForCurrentSection = [self.tableContents objectForKey:[NSString stringWithFormat:@"%d",indexPath.section]];

    UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:SimpleTableIdentifier];

    if (cell == nil) {
        cell = [[[UITableViewCell alloc]
                 initWithStyle:UITableViewCellStyleSubtitle
                 reuseIdentifier:SimpleTableIdentifier] autorelease];
    }
    cell.textLabel.text = [arrayForCurrentSection objectAtIndex:indexPath.row];

    return cell;
}

关于ios - 嵌套NSArray的UITableView中的不同节标题，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/10155544/