ios - 在 UITableView 中的部分索引标题之间添加填充(或增加高度)

Question

我已经通过方法 sectionIndexTitlesForTableView: 和 sectionForSectionIndexTitle: 为我的 UITableView 实现了一个部分索引。我只有几个部分，默认情况下它们在屏幕上垂直居中，每个索引标题之间的空间很小。我在其他应用程序中看到它们增加了索引之间的空间量，虽然不是很大，但至少增加了几个点以给它们一些喘息的空间，并在用户尝试点击他们想要的那个时提高准确性。我想知道如何才能做到这一点？

这正是我想要获得的——注意右边索引之间的额外空间:

Answer 1

您可以做的是添加此 answer 中建议的额外空格.

First, let's create an array with the fake index.

NSArray *array = self.mydataArray; // here are your true index
self.sectionsTitle = [NSMutableArray array];
int n = array.count;

// In IOS 7 all index of the items are clumped together in the middle,
// making the items difficult to tap.
// As workaround we added "fake" sections index
// reference: https://stackoverflow.com/questions/18923729/uitableview-section-index-spacing-on-ios-7

for (int i = 0; i < n; i++){
    [self.sectionsTitle  addObject:array[i]];
    [self.sectionsTitle  addObject:@""];
}

Then, you can implement tableview delegate methods with the following approach:

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
    // In IOS 7 all index of the items are clumped together in the middle,
    // making the items difficult to tap.
    // As workaround we added "fake" sections index
    // reference: https://stackoverflow.com/questions/18923729/uitableview-section-index-spacing-on-ios-7
    if ([sectionsTitle[section] isEqualToString:@""]){
        return 0;
    }
    return x; // return your desire section height 
}

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    // In IOS 7 all index of the items are clumped together in the middle,
    // making the items difficult to tap.
    // As workaround we added "fake" sections index
    // reference: https://stackoverflow.com/questions/18923729/uitableview-section-index-spacing-on-ios-7
    if ([sectionsTitle[section] isEqualToString:@""]){
        return nil;
    }else{
       // return your desire header view here, 
       // if you are using the default section header view, 
       // you don't need to implement this method
    }

- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
    return self.sectionsTitle;
}

- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index {
    // In IOS 7 all index of the items are clumped together in the middle,
    // making the items difficult to tap.
    // As workaround we added "fake" sections index
    // reference: https://stackoverflow.com/questions/18923729/uitableview-section-index-spacing-on-ios-7
    if ([title isEqualToString:@""]){
         return -1;
    }
    return [sectionsTitle indexOfObject:title];
}


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // In IOS 7 all index of the items are clumped together in the middle,
    // making the items difficult to tap.
    // As workaround we added "fake" sections index
    // reference: https://stackoverflow.com/questions/18923729/uitableview-section-index-spacing-on-ios-7
    if ([sectionsTitle[section] isEqualToString:@""]){
        return 0;
    }
    return // your logic here;
}

希望对您有所帮助。