我有一个NSMutableArray:self.contact带有对象(名称按字母顺序排序):
(
"Anna Haro",
"Cheesy Cat",
"Daniel Higgins",
"David Taylor",
"Freckles Dog",
"Hank Zakroff",
"John Appleseed",
"Kate Be\U00e9ll"
)
我用这行代码成功地在右边显示了字母:
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
return[NSArray arrayWithObjects:@"A", @"B", @"C", @"D", @"E", @"F", @"G", @"H", @"I", @"J", @"K", @"L", @"M", @"N", @"O", @"P", @"Q", @"R", @"S", @"T", @"U", @"V", @"W", @"X", @"Y", @"Z", nil];
}
现在,我要实现允许我访问好部分的方法？
- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString*)title atIndex:(NSInteger)index {
}
也许我要改变numberOfSections？这是我的代码:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1
}
下一个 :
我做了两个阵列NSArray …
该didSelectRowAtIndexPath方法在我的应用中无效.我不打印任何输出NSLog:
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
PhotoCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];
PFObject *imageObject = [self.imageFilesArray objectAtIndex:indexPath.row];
PFFile *imageFile = [imageObject objectForKey:@"file"];
[imageFile getDataInBackgroundWithBlock:^(NSData *data, NSError *error) {
if (!error) {
cell.imageView.image = [UIImage imageWithData:data];
}
}];
return cell;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
PhotoCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];
NSLog(@"didSelectRowAtIndexPath");
cell.imageView.image = self.image;
return cell;
}
我希望当我点击一个单元格时,选择图像并将图像赋予self.image.
我们能用segue做到吗？因为我的didSelectRowAtIndexPath方法根本不起作用.
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:@"showPhotoDetail"]) { …我想在tableView中使用searchbar.我有一个带有人的NSArray(NSObject).在cellForRow中,我正在使用此代码:
Person *person = [[self.sectionedPersonName objectAtIndex:indexPath.section] objectAtIndex:indexPath.row];
cell.textLabel.text = person.fullName;
并为searchBar这段代码:
- (void)searchForText:(NSString *)searchText {
if (searchText.length > 0) {
searchBar = YES;
} else {
searchBar = NO;
}
NSLog(@"%@", self.sectionedPersonName);
NSPredicate *predicate; = [NSPredicate predicateWithFormat:@"SELF.fullName beginswith[c] %@", searchText];
self.searchResults = [self.sectionedPersonName filteredArrayUsingPredicate:predicate];
}
self.sectionedPersonName 包含这个:
(
(
"<Person: 0x7fc0f6012650>"
),
(
),
(
),
(
"<Person: 0x7fc0f600f8a0>",
"<Person: 0x7fc0f60132e0>"
),
(
),
(
),
(
),
(
"<Person: 0x7fc0f6012d80>"
),
(
),
(
"<Person: 0x7fc0f6012b30>"
),
(
"<Person: …