在我的Parse应用程序中，我启用了Pagination，并且出于测试目的，每页的对象设置为5.当我运行应用程序时，我在TableView中得到它
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加载更多
单击“加载更多”后，整个表格如下所示：
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在此之后单击“加载更多”将两次添加11-15的集合。发生了什么事？
- (id)initWithCoder:(NSCoder *)aDecoder
{
self = [super initWithCoder:aDecoder];
if (self) {
// The className to query on
self.parseClassName = @"Prayers";
// Whether the built-in pull-to-refresh is enabled
self.pullToRefreshEnabled = YES;
// Whether the built-in pagination is enabled
self.paginationEnabled = YES;
// The number of objects to show per page
self.objectsPerPage = 5;
}
return self;
}
- (PFQuery *)queryForTable {
PFQuery *query = [PFQuery queryWithClassName:@"Prayers"];
// If no objects are loaded in memory, we look to the cache first to fill the table
// and then subsequently do a query against the network.
if (self.objects.count == 0) {
query.cachePolicy = kPFCachePolicyCacheThenNetwork;
}
[query orderByDescending:@"createdAt"];
return query;
}
- (UITableViewCell *)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath
object:(PFObject *)object
{
static NSString *CellIdentifier = @"Cell";
Cell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[Cell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
self.theObject = object;
BOOL anony = [object[@"Anonymous"] boolValue];
cell.profileName.text = object[@"Title"];
cell.contentLabel.text = object[@"Request"];
cell.firstName = object[@"FirstName"];
cell.lastName = object[@"LastName"];
cell.iostoken = object[@"DeviceID"];
cell.request = object[@"Title"];
cell.prayerObject = object;
PFFile *thumbnail = object[@"ProfilePic"];
cell.profilePic.image = [UIImage imageNamed:@"AppIcon60x60@2x.png"];
/*[cell.commentButton addTarget:self action:@selector(didTapCommentButtonAction:) forControlEvents:UIControlEventTouchUpInside];
[cell.commentButton setTitle:@"Share" forState:UIControlStateNormal];
[cell.commentButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[cell.commentButton setTitleColor:[UIColor greenColor] forState:UIControlStateHighlighted];*/
[thumbnail getDataInBackgroundWithBlock:^(NSData *imageData, NSError *error) {
UIImage *thumbnailImage = [UIImage imageWithData:imageData];
UIImageView *thumbnailImageView = [[UIImageView alloc] initWithImage:thumbnailImage];
cell.profilePic.image = thumbnailImage;
}];
NSString *dates = object[@"dateMade"];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"MMM_dd_yyyy"];
NSDate *datefromstring = [formatter dateFromString:dates];
NSDateFormatter *formatter2 = [[NSDateFormatter alloc] init];
[formatter2 setDateFormat:@"MMM dd, yyyy"];
cell.dateLabel.text = [formatter2 stringFromDate:datefromstring];
UIFont *cellFont = [UIFont fontWithName:@"Verdana-Bold" size:15];
UIFont *cellFont2 = [UIFont fontWithName:@"Verdana-Bold" size:12];
return cell;
}
- (PFObject *)objectAtIndexPath:(NSIndexPath *)indexPath {
if (indexPath.row == self.objects.count) {
return nil;
} else {
return [super objectAtIndexPath:[NSIndexPath indexPathForRow:indexPath.row inSection:indexPath.section]];
}
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
PFObject *object = [self objectAtIndexPath:indexPath];
if (object == nil) {
// Return a fixed height for the extra ("Load more") row
return 70;
} else {
NSLog(@"%lu", (unsigned long)[self.objects count]);
PFObject *entry = [self.objects objectAtIndex:indexPath.row];
NSString *commentString = entry[@"Request"];
NSString *nameString = @"";
NSLog(@"%@", commentString);
return [Cell heightForCellWithContentString:(NSString *)commentString] +25 ;
}
}
#pragma mark -
#pragma mark Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[super tableView:tableView didSelectRowAtIndexPath:indexPath];
[tableView deselectRowAtIndexPath:indexPath animated:YES];
if (indexPath.row == self.objects.count && self.paginationEnabled) {
// Load More Cell
NSLog(@"Load More");
[self loadNextPage];
}
答案 0 :(得分：1)
-(PFQuery *)queryForTable {
...
...
...
//Always trigger a network request.
[tableQuery setCachePolicy:kPFCachePolicyNetworkOnly];
//If no objects are loaded in memory, we look to the cache first to fill the table and then subsequently do a query against the network.
if(self.objects.count == 0) {
[tableQuery setCachePolicy: kPFCachePolicyCacheThenNetwork];
}
...
...
...
return tableQuery;
}