Question

我有Tableview其中有A到Z的部分（我没有动态计算任何部分）

我想这样显示：：我的数组值： msg_array = [“AajKaCatch”，“AajKaItem”，“Anari”，“Big C Mobiles”，“Big Flix”，“BigRock”，“caksonflowers，......”]

当我尝试在cellForRowAtIndexPath中显示这样的内容时显示NSInvalidArgumentException

cell.textLabel.text=[[[msg_array objectAtIndex:indexPath.section] objectAtIndex:indexPath.row] objectForKey:@"Merchant_Name"];

请提前帮助并致谢。

Answer 1

当你这样做时：

[[[msg_array objectAtIndex:indexPath.section] objectAtIndex:indexPath.row] objectForKey:@"Merchant_Name"];

您正在访问msg_array的元素，就好像它是一个包含NSDictionary的NSArray。

但是，在msg_array中你只有NSStrings。

您正在试图访问的结构是：

NSArray -> NSArray -> NSDictionary

你有

NSArray -> NSString

Answer 2

你的数组就像：

array{object,object,object,object,object};

在这种情况下，你不能使用：

[[msg_array objectAtIndex:indexPath.section] objectAtIndex:indexPath.row]

因为要实现这样的一个，[msg_array objectAtIndex:indexPath.section]应该返回一个数组。

所以实现这个，你需要尝试这样：

array{array{objects starts with 'A'},array{objects starts with 'B'},array{objects starts with 'C'}};

Answer 3

我已经为联系信息和使用FKRSearchBarTableViewController的其他事情做了同样的事情，请参阅链接，下面是FKRSearchBarTableViewController的地下代码

    - (id)initWithSectionIndexes:(BOOL)showSectionIndexes withDataSource:(NSArray*) dataSource withControllerId:(int) ControllerId forGroup:(int)groupId
{
if ((self = [super initWithNibName:nil bundle:nil])) {
    self.title = @"Search Bar";
    NSLog(@"%d",groupId);
    _groupID = groupId;
    _controllerId = ControllerId;

    _showSectionIndexes = showSectionIndexes;

    _famousPersons = [[NSMutableArray alloc]initWithArray:dataSource];
    if (showSectionIndexes) {
        UILocalizedIndexedCollation *collation = [UILocalizedIndexedCollation currentCollation];

        NSMutableArray *unsortedSections = [[NSMutableArray alloc] initWithCapacity:[[collation sectionTitles] count]];
        for (NSUInteger i = 0; i < [[collation sectionTitles] count]; i++) {
            [unsortedSections addObject:[NSMutableArray array]];
        }
        if(ControllerId == 5)
        {
        for (Person *personName in self.famousPersons) {

               // NSInteger index = [collation sectionForObject:[personName objectForKey:@"FirstName"] collationStringSelector:@selector(description)];
            NSLog(@"%@",personName.firstName);
            NSInteger index = [collation sectionForObject:personName.firstName collationStringSelector:@selector(description)];
                [[unsortedSections objectAtIndex:index] addObject:personName];
        }
        }
        else
        {
            for (NSDictionary *personName in self.famousPersons) {

                 NSInteger index = [collation sectionForObject:[personName objectForKey:@"FirstName"] collationStringSelector:@selector(description)];

                [[unsortedSections objectAtIndex:index] addObject:personName];
            }

        }

        NSMutableArray *sortedSections = [[NSMutableArray alloc] initWithCapacity:unsortedSections.count];
        for (NSMutableArray *section in unsortedSections) {
            [sortedSections addObject:[NSMutableArray arrayWithArray:[collation sortedArrayFromArray:section collationStringSelector:@selector(description)]]];
        }

        self.sections = [NSMutableArray arrayWithArray:sortedSections];

    }

Answer 4

使列表更具动态性，解决方案应该是

// given NSArray names = your full list of name
//       NSArray indexes = your list of index

NSMutableArray *nameSections = [NSMutableArray arrayWithCapacity:26];
NSMutableArray *filteredIndexes = [NSMutableArray arrayWithCapacity:26];

for (NSString *index in indexes) {

    NSPredicate *predicate = [NSPredicate predicateWithFormat:
                              @"SELF beginswith[c] %@",index];
    NSArray *filterNames = [names filteredArrayUsingPredicate:predicate];

    if(filterNames.count>0){
        [nameSections addObject:filterNames];
        [filteredIndexes addObject:index];
    }
}


NSLog(@"filteredIndexes %@",filteredIndexes);
NSLog(@"nameSections %@",nameSections);


numOfSection = nameSections.count
numOfRow = [[numOfSection indexOfObject:section]count];
name = [[numOfSection indexOfObject:section]] indexOfObject:row];


// print log
//given indexes array a~z

names (
"a_string",
"a_string2",
"b_string",
"b_string2"
)

filteredIndexes (
a,
b
)

nameSections (
    (
    "a_string",
    "a_string2"
    ),
    (
    "b_string",
    "b_string2"
    )
)

显示单元格部分崩溃iOS应用程序

4 个答案: