Populate UITableView Sections table with Single NSMutableArray

问题

Sorry to ask again the question with full description.What i have that i have resultsArray which has title description etc which gets from server but problem is that i want to show this data in sections.

So lets say if have three sections which are coming from array then how will populate the data in each section using single resultArray.

   - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
    {
return [categoryArray objectAtIndex:section];
}

resutArray has all the data for all sections so how to show according to sections

Structure of array is

             ObjectData *theObject =[[ObjectData alloc] init];
            [theObject setCategory:[dict objectForKey:@"category"]];
            [theObject setSub_Category:[dict objectForKey:@"sub_Category"]];    
            [theObject setContent_Type:[dict objectForKey:@"content_Type"]];
            [theObject setContent_Title:[dict objectForKey:@"content_Title"]];
            [theObject setPublisher:[dict objectForKey:@"publisher"]];
            [theObject setContent_Description:[dict objectForKey:@"content_Description"]];
    [theObject setContent_ID:[dict objectForKey:@"content_ID"]];
    [theObject setContent_Source:[dict objectForKey:@"content_Source"]];
        [resultArray addObject:theObject];

回答1:

Look's like you have ObjectData which has attribute called category, and you want to show table view with ObjectData's grouped by categories. You may do this generating an NSDictionary with key = unique category, and value = NSArray of ObjectData of that category. Then you use that NSDictionary as a data for datacource.

NSArray *tempArray =[[DataController staticVersion] startParsing:@"http://www.celeritas-solutions.com/pah_brd_v1/productivo/catalogMaster.php"];
// dictionary for cells, you'll probably want this to be ivar or property
NSMutableDictionary* dictionary = [NSMutableDictionary dictionary];
// array for headers, you'll probably want this to be ivar or property
NSMutableArray* categories = [NSMutableArray array];

for (int i = 0; i<[tempArray count]; i++) {

    id *item = [tempArray objectAtIndex:i];
    NSDictionary *dict = (NSDictionary *) item;
    ObjectData *theObject =[[ObjectData alloc] init];
    [theObject setCategory:[dict objectForKey:@"category"]];
    [theObject setSub_Category:[dict objectForKey:@"sub_Category"]];
    [theObject setContent_Type:[dict objectForKey:@"content_Type"]];
    [theObject setContent_Title:[dict objectForKey:@"content_Title"]];
    [theObject setPublisher:[dict objectForKey:@"publisher"]];
    [theObject setContent_Description:[dict objectForKey:@"content_Description"]];
    [theObject setContent_ID:[dict objectForKey:@"content_ID"]];
    [theObject setContent_Source:[dict objectForKey:@"content_Source"]];


    [resultArray addObject:theObject];
    [theObject release];
    theObject=nil;

    // here you populate that dictionary and categories array
    NSMutableArray* objs = [dictionary objectForKey:theObject.category];
    if(!objs)
    {
        objs = [NSMutableArray array];
        [dictionary setObject:objs forKey:theObject.category];
        [categories addObject:theObject.category];
    }
    [objs addObject:theObject];
}

Then in your controller:

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

    return [categories count] ;

}

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

      return [categories objectAtIndex:section];
}



- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"CellID";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) 
    {
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue2 reuseIdentifier:CellIdentifier];
    }

    NSString* category = [categories objectAtIndex: indexPath.section];
    NSMutableArray* objs = [dictionary objectForKey:category];
    ObjectData* obj = [objs objectAtIndex: indexPath.row];

    // populate cell here

}

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

    NSString* category = [categories objectAtIndex:section];
    NSMutableArray* objs = [dictionary objectForKey:category];
    return [objs count];
}

Note that that's just an example for you, you may optimize this as you want.

回答2:

Using custom class you can achieve this.

myClass.h

@interface myClass : NSObject
@property(nonatomic,retain) NSString* sectionHeader;
@property(nonatomic,retain) NSMutableArray* sectionRows;
@end

myClass.m

#import "myClass.h"

@implementation myClass
@synthesize sectionHeader;
@synthesize sectionRows;
@end

First you need to set up your resultArray with above class object. Set Appropriate value for class. Example:

myClass *myClassObj = [[myClass alloc] init];
myClassObj.sectionHeader = @"Your section title";
myClassObj.sectionRows   = < Your NSMutableArray for rows under current section >;
[retunArray addObject:myClassObj];

Now Set numberOfSectionsInTableView , numberOfRowsInSection, titleForHeaderInSection, cellForRowAtIndexPath

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return [returnArray count];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [[returnArray objectAtIndex:section] count];
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    myClass *myClassObject = [returnArray objectAtIndex:section];
    return myClassObject.sectionHeader;
}

- (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] autorelease];
    }

    myClass *myClassObject = [returnArray objectAtIndex:indexPath.section];
    NSLog(@"%@",[myClassObject.sectionRows objectAtIndex:indexPath.row]);

    return cell;
}

回答3:

If all you have is an NSMutableArray and you want to split it into sections means you have to know index of objects. For example,

[
Section 1,
Section1,
Section1,
Section 2,
Section 2,
Section2,
Section 3,
Section 3,
Section 3
]

in 1st sections display data from 0 to 2 index, in 2nd from 3 to 5 index, in 3rd from 6 to 8 index.

Else better go for NSDictionary. Keep section title as key and the values as NSArray in Dictionary. So it will be easier to load the cell.

You have NSArray Of Object Data.. So you can do it as

    NSMutableDictionary *sectionDict = [[NSMutableDictionary alloc] init];

    for(int i=0; i < [data count]; i++)
    {
ObjectData *theObject = [data objectAtIndex:i];
        NSMutableArray *arr;
        if([sectionDict valueForKey:theObject.category])
        {
            arr = [sectionDict valueForKey:theObject.category];
        }
        else
        {
            arr = [[NSMutableArray alloc] init];
        }
        [arr addObject:theObject];
        [sectionDict setObject:arr forKey:theObject.category];
    }

So now you will have required data...

回答4:

Do same as in the sample code

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return [sectionArray count];
}

-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
 //Do your stuff
}

回答5:

You might also find it much easier to use the free Sensible TableView framework. The framework will simply take your array and generate all the table view cells and sections, including all the detail views if you wish. I find it much simpler and literally takes a few minutes to implement.

来源：https://stackoverflow.com/questions/15631115/populate-uitableview-sections-table-with-single-nsmutablearray

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