ios - 如何从字符串数组制作uitableview索引和节

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我有一个名称数组，我想将节标题设为字母，例如A BC。还有索引。用名称数组制作Sections的最有效方法是什么

最佳答案

这是我开发的在NSArray上处理并创建您所关注的NSDictionary的方法。

- (void)viewDidLoad {
    [super viewDidLoad];

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

    NSDictionary* dictStructued = [self sortArrayAndMakeStructur:internalArray];

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

}

这是您的整个方法。

-(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;
}

这里节数= [[dictStructued allKeys] count];

行数= [[dictIndexes valueForKey:yourKey] count];

输出：

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