遇到UITableView字母顺序问题

时间:2016-03-13 13:33:58

标签: ios objective-c iphone uitableview

我有一个plist文件,其中包含一些名称,我为部分的图块创建了NSMultipleArray,这是一个字母。我从plist文件中获取名称:

- (void)viewDidLoad {
 NSString *filePath = [[NSBundle mainBundle]pathForResource:@"NameList" ofType:@"plist"] ;
    namesArray = [NSArray arrayWithContentsOfFile:filePath];

//create alphabetic letters
    alphabetsSection = [NSMutableArray arrayWithObjects:@"A", @"B", @"C", @"D", @"E", @"F", @"G", @"H", @"I", @"J", @"K", @"L", @"M", @"N", @"O", @"P", @"Q", @"R", @"S", @"T", @"U", @"V", @"W", @"X", @"Y", @"Z", nil];

}

TableView设置:

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {

    return alphabetsSection.count;
}


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


    return (NSString*)[alphabetsSection objectAtIndex:section];

}

- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString*)title atIndex:(NSInteger)index
{
    return index;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    NSArray *sectionArray = [namesArray filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"SELF beginswith[c] %@", [alphabetsSection objectAtIndex:section]]];
    return sectionArray.count;
}


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

    NSString*cellIdentifier = @"cell";

    CustomCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];

    if (cell == nil) {

        cell  = [[CustomCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
    }


    //*** I THIK HERE IS THE PROBLEM ****//
    NSString *sectionTitle = [alphabetsSection objectAtIndex:indexPath.section];
    cell.DCName.text = [dinoNamesArray objectAtIndex:indexPath.row];


    return cell;

}

问题是只有字母A的名称在节中显示。我不知道如何将namesArray添加到sectionTitle

2 个答案:

答案 0 :(得分:1)

这是让您的代码正常运行的快速解决方法。在cellForRowAtIndexPath

NSString *sectionTitle = [alphabetsSection objectAtIndex:indexPath.section];
NSArray *sectionArray = [namesArray filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"SELF beginswith[c] %@", sectionTitle]];
cell.DCName.text = [sectionArray objectAtIndex:indexPath.row];

但是这将在显示每一行时过滤数组,这将很慢:在首次加载视图时,最好只对每个部分进行一次过滤。这些方面的东西:

- (void)viewDidLoad {
    NSString *filePath = [[NSBundle mainBundle]pathForResource:@"NameList" ofType:@"plist"] ;
    namesArray = [NSArray arrayWithContentsOfFile:filePath];

    //create alphabetic letters
    alphabetsSection = [NSMutableArray arrayWithObjects:@"A", @"B", @"C", @"D", @"E", @"F", @"G", @"H", @"I", @"J", @"K", @"L", @"M", @"N", @"O", @"P", @"Q", @"R", @"S", @"T", @"U", @"V", @"W", @"X", @"Y", @"Z", nil];
    // create a corresponding array holding the objects for each section
    arrayForSection = [NSMutableArray array]
    for (NSString *letter in alphabetsSection) {
        NSArray *sectionArray = [namesArray filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"SELF beginswith[c] %@", letter]];
        [arrayForSection addObject:sectionArray];
    }
}

(您需要添加一个属性NSMutableArray *arrayForSection)。

这构建了一个数组arrayForSection,其中每个元素都是一个数组,其中的对象属于表的相应部分。因此,您可以修改数据源方法以使用此数组:

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    NSArray *sectionArray = arrayForSection[section];
    return sectionArray.count;
}

cellForRowAtIndexPath

NSArray *sectionArray = arrayForSection[indexPath.section];
cell.DCName.text = [sectionArray objectAtIndex:indexPath.row];

答案 1 :(得分:0)

=>请参阅下面的帖子,这将有助于您进一步澄清: -

how to read Plist data to UITableView