How to make uitableview indexes and sections from Array of stings [closed]

问题

I have an array of names I want to make section headers as alphabets such as A B C. Also the indexes. What's the most efficient way of making Sections out of an array of names

回答1:

Here are i developed method that process on NSArray and created NSDictionary that you aspected.

- (void)viewDidLoad {
    [super viewDidLoad];

    NSMutableArray* internalArray = [NSMutableArray arrayWithObjects:@"abc",@"xyz",@"aa",@"bb", nil];

    NSDictionary* dictStructued = [self sortArrayAndMakeStructur:internalArray];

   NSLog(@"Output : %@",dictStructued.description);

}

Here is your whole method..

-(NSMutableDictionary*)sortArrayAndMakeStructur:(NSArray*)array{

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

    NSArray* sortedArray = [array sortedArrayUsingSelector:
                                    @selector(localizedCaseInsensitiveCompare:)];

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

        NSString* strName = sortedArray[i];
        if ([[dictIndexes allKeys] containsObject:[[strName substringToIndex:1] uppercaseString]]) {
            NSMutableArray* internalArray = [NSMutableArray arrayWithArray:[dictIndexes valueForKey:[[strName substringToIndex:1] uppercaseString]]];
            [internalArray addObject:strName];

            [dictIndexes setObject:internalArray forKey:[[strName substringToIndex:1] uppercaseString]];
        }
        else{
            NSMutableArray* internalArray = [NSMutableArray arrayWithObjects:strName, nil];

            [dictIndexes setObject:internalArray forKey:[[strName substringToIndex:1] uppercaseString]];

        }

    }

    return dictIndexes;
}

Here section count = [[dictStructued allKeys] count];

Number Of Row = [[dictIndexes valueForKey:yourKey] count];

Output :

{
    A =     (
        aa,
        abc
    );
    B =     (
        bb
    );
    X =     (
        xyz
    );
}

回答2:

Please use nesting NSArray or NSDictionary that has array with each key.

Cited from: http://www.appcoda.com/ios-programming-index-list-uitableview/

回答3:

First, we sort them with alphabet:

NSMuatableArray* sortedArray = [anArray sortedArrayUsingSelector:
                           @selector(localizedCaseInsensitiveCompare:)];

and we populate it normally in - (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section

Hope this could help.

来源：https://stackoverflow.com/questions/31201038/how-to-make-uitableview-indexes-and-sections-from-array-of-stings

标签

ios

uitableview