问题
I have a grouped uitableview which has several sections. The sections are showing up fine and the number of rows is correct, however there is a problem with the positioning of the list items. I have an NSMutableArray with a list of names, I then split this array up using subArrayWithRange. Please see the code for more detail. The problem is that the list items are not appearing under the correct section, I can't seem to find the solution.
In cellForRowAtIndexPath:
NSInteger section = [indexPath section];
NSString *sectionName = [sectionNamesArray objectAtIndex:section];
NSCountedSet *set = [[NSCountedSet alloc] initWithArray:townArray];
int numOfRows = [set countForObject:[NSString stringWithFormat:@"%@",sectionName]];
int initNumRows = [set countForObject:[NSString stringWithFormat:@"%@",[sectionNamesArray objectAtIndex:0]]];
if(section == 0) {
NSRange range = NSMakeRange(0,numOfRows);
NSArray *subArray = [[namesArray subarrayWithRange:range] retain];
NSArray *subTownArray = [[townArray subarrayWithRange:range]retain];
//indexTracker = indexPath.row;
//NSLog(@"sub array === %@, index Tracker = %i",subArray,indexTracker);
cell.primaryLabel.text = [subArray objectAtIndex:indexPath.row];
cell.secondaryLabel.text = [subTownArray objectAtIndex:indexPath.row];
} else if (section == [sectionNamesArray count]-1) {
int previousSection = section - 1;
int previousNumRows = [set countForObject:[NSString stringWithFormat:[sectionNamesArray objectAtIndex:previousSection]]];
NSRange range = NSMakeRange(previousNumRows+initNumRows,numOfRows);
NSLog(@"previous num rows = %i and current num of rows = %i",previousNumRows,numOfRows);
NSArray *subArray = [[namesArray subarrayWithRange:range] retain];
NSArray *subTownArray = [[townArray subarrayWithRange:range]retain];
cell.primaryLabel.text = [subArray objectAtIndex:indexPath.row];
cell.secondaryLabel.text = [subTownArray objectAtIndex:indexPath.row];
NSLog(@"sub array === %@",subArray);
} else {
int previousSection = section - 1;
int previousNumRows = [set countForObject:[NSString stringWithFormat:[sectionNamesArray objectAtIndex:previousSection]]];
int location = previousNumRows;
NSRange range = NSMakeRange(previousNumRows,numOfRows);
NSLog(@"location = %i",location);
NSLog(@"previous num rows = %i and current num of rows = %i",previousNumRows,numOfRows);
NSArray *subArray = [[namesArray subarrayWithRange:range] retain];
NSArray *subTownArray = [[townArray subarrayWithRange:range]retain];
cell.primaryLabel.text = [subArray objectAtIndex:indexPath.row];
cell.secondaryLabel.text = [subTownArray objectAtIndex:indexPath.row];
} //NSLog(@"section name = %@ . num of rows = %i",sectionName,numOfRows);
return cell;
回答1:
I think you are over-complicating things. Why not create your sections (a Dictionary with just the section titles) with the data you have and then do something like this in the cellForRowAtIndexPath:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSDictionary *selRow = [[self.units valueForKey:[[[self.units allKeys] sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)] objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row];
...
}
Here is the method I use for building that Dictionary:
-(void)buildSectionKeysWithMutableArray:(NSMutableArray *)mutableArray {
NSMutableString *prevUnit;
units = [[NSMutableDictionary alloc] init];
// Loop through the mutableArray passed in and build our keys
for (NSDictionary *thisUnit in mutableArray)
{
NSString *unitName = [thisUnit objectForKey:@"LOCATION"];
if (![prevUnit isEqualToString:unitName]) {
[self.units setValue:[[NSMutableArray alloc] init] forKey:unitName];
}
prevUnit = [NSString stringWithString:unitName];
}
// Loop again and add the keys into the units mutableDictionary
for (NSDictionary *thisUnit in mutableArray)
{
[[self.units objectForKey:[thisUnit objectForKey:@"LOCATION"]] addObject:thisUnit];
}
}
This allows you to keep the presentation of the data dynamic.
来源：https://stackoverflow.com/questions/8802295/iphone-sdk-grouped-uitableview-sections-list-items-not-showing-under-correct-s