在我的应用程序中，我有一个显示会议列表的PFQueryTableViewController。点击自定义表格视图单元格会推送会议本身的详细视图，在此视图中，用户可以通过按钮取消会议。我设法在表视图中实现两个部分，一个用于由当前用户创建的会议，另一个用于其他部分。表视图工作正常并正确提取我的解析数据，但如果我进入详细视图并取消会议，然后返回表视图，应用程序将终止并显示错误。同样的事情，如果我只是删除解析Core中的一个会议，然后拉动刷新表视图。错误是这样的：
*** Terminating app due to uncaught exception 'NSRangeException', reason: '*** - [__NSArrayM objectAtIndex:]: index 1 beyond bounds [0 .. 0]'
*** First throw call stack:
(
0 CoreFoundation 0x000000010c4703f5 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x000000010c109bb7 objc_exception_throw + 45
2 CoreFoundation 0x000000010c35b4d3 -[__NSArrayM objectAtIndex:] + 227
3 SpeedMeet_1.0 0x0000000107d28fbc -[PFQueryTableViewController tableView:cellForRowAtIndexPath:] + 167
4 UIKit 0x000000010aabdcd3 -[UITableView _createPreparedCellForGlobalRow:withIndexPath:willDisplay:] + 508
5 UIKit 0x000000010aa9d7f1 -[UITableView _updateVisibleCellsNow:isRecursive:] + 2846
6 UIKit 0x000000010aab365c -[UITableView layoutSubviews] + 213
7 UIKit 0x000000010aa40199 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 521
8 QuartzCore 0x0000000109b60f98 -[CALayer layoutSublayers] + 150
9 QuartzCore 0x0000000109b55bbe _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380
10 QuartzCore 0x0000000109b55a2e _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
11 QuartzCore 0x0000000109ac3ade _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 242
12 QuartzCore 0x0000000109ac4bea _ZN2CA11Transaction6commitEv + 390
13 QuartzCore 0x0000000109ac5255 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 89
14 CoreFoundation 0x000000010c3a5347 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
15 CoreFoundation 0x000000010c3a52a0 __CFRunLoopDoObservers + 368
16 CoreFoundation 0x000000010c39b0d3 __CFRunLoopRun + 1123
17 CoreFoundation 0x000000010c39aa06 CFRunLoopRunSpecific + 470
18 GraphicsServices 0x000000010c9859f0 GSEventRunModal + 161
19 UIKit 0x000000010a9c7550 UIApplicationMain + 1282
20 SpeedMeet_1.0 0x0000000107cec163 main + 115
21 libdyld.dylib 0x000000010ccdc145 start + 1
22 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
我在viewWillAppear中调用的loadobject方法应该清除表视图然后重新加载它的数据，所以我不明白为什么会发生这种情况。 这是我的实现文件：
@interface SMConfirmedMeetingsTableViewController ()
@property (strong,nonatomic) NSMutableArray *dataArray;
@property (strong,nonatomic) NSMutableArray *firstSectionArray;
@property (strong,nonatomic) NSMutableArray *secondSectionArray;
@end
@implementation SMConfirmedMeetingsTableViewController
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:UITableViewStyleGrouped];
if (self) {
// Custom the table
// The className to query on
self.parseClassName = @"MeetingObject";
// The title for this table in the Navigation Controller.
self.title = @"Confirmed meetings";
// 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 = 20;
}
return self;
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
UIBarButtonItem *menuIcon = [[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"menu_icon.png"] style:UIBarButtonItemStylePlain target:self action:@selector(showMenu:)];
self.navigationItem.leftBarButtonItem = menuIcon;
UINib *nib = [UINib nibWithNibName:@"SMShowMeetingTableViewCell" bundle:nil];
[self.tableView registerNib:nib forCellReuseIdentifier:@"SMShowMeetingTableViewCell"];
}
-(void)viewWillAppear:(BOOL)animated
{
[self loadObjects];
}
#pragma mark - Parse
- (void)objectsDidLoad:(NSError *)error {
[super objectsDidLoad:error];
if (error) {
// something
}
// This method is called every time objects are loaded from Parse via the PFQuery
PFUser *currentUser = [PFUser currentUser];
self.dataArray = [[NSMutableArray alloc] init];
self.firstSectionArray = [[NSMutableArray alloc] init];
self.secondSectionArray = [[NSMutableArray alloc] init];
for (PFObject *object in self.objects) {
NSString *author = [object objectForKey:@"author"];
if ([author isEqualToString: currentUser.username]) {
//first section
[self.firstSectionArray addObject:object];
}else{
//second section
[self.secondSectionArray addObject:object];
}
}
//add firstsection to the data array
NSDictionary *firstItemsArrayDict = [NSDictionary dictionaryWithObject:self.firstSectionArray forKey:@"data"];
[self.dataArray addObject:firstItemsArrayDict];
//add Secondsection to the data array
NSDictionary *secondItemsArrayDict = [NSDictionary dictionaryWithObject:self.secondSectionArray forKey:@"data"];
[self.dataArray addObject:secondItemsArrayDict];
}
- (PFQuery *)queryForTable {
PFUser *currentUser = [PFUser currentUser];
PFQuery *queryAsAuthor = [PFQuery queryWithClassName:self.parseClassName];
[queryAsAuthor whereKey:@"user" equalTo: currentUser];
PFQuery *queryAsParticipant = [PFQuery queryWithClassName:self.parseClassName];
[queryAsParticipant whereKey:@"participants" equalTo:currentUser.username];
PFQuery *query = [PFQuery orQueryWithSubqueries:@[queryAsAuthor, queryAsParticipant]];
[query whereKey:@"isAvailable" equalTo:[NSNumber numberWithBool:NO]];
[query orderByAscending:@"meetingDateAndTime"];
return query;
}
# pragma mark - Table view
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return self.dataArray.count;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
if (section == 0) {
return self.firstSectionArray.count;
}else
return self.secondSectionArray.count;
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
// sections title text
if (section==0) {
return @"Created by me";
}else return @"Created by others";
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 50;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath object:(PFObject *)object {
static NSString *CellIdentifier = @"SMShowMeetingTableViewCell";
SMShowMeetingTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[SMShowMeetingTableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
NSDictionary *dictionary = [self.dataArray objectAtIndex:indexPath.section];
NSArray *array = [dictionary objectForKey:@"data"];
PFObject *obj = [array objectAtIndex:indexPath.row];
cell.categoryLabel.text = [obj objectForKey:@"meetingCategoryString"];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateStyle = NSDateFormatterLongStyle;
dateFormatter.timeStyle = NSDateFormatterNoStyle;
cell.dateLabel.text = [dateFormatter stringFromDate:[obj objectForKey:@"meetingDateAndTime"]];
cell.locationLabel.text = [obj objectForKey:@"meetingLocationString"];
return cell;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForNextPageAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"NextPage";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.textLabel.text = NSLocalizedString(@"Loading more meetings...",@"loading");
cell.userInteractionEnabled = NO;
return cell;
}
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[super tableView:tableView didSelectRowAtIndexPath:indexPath];
NSDictionary *dictionary = [self.dataArray objectAtIndex:indexPath.section];
NSArray *array = [dictionary objectForKey:@"data"];
PFObject *obj = [array objectAtIndex:indexPath.row];
SMShowMeetingDetailViewController *meetingDetail = [[SMShowMeetingDetailViewController alloc]init];
meetingDetail.isMyMeetings = YES;
meetingDetail.meeting = obj;
[self.navigationController pushViewController:meetingDetail animated:YES];
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
if (scrollView.contentSize.height - scrollView.contentOffset.y < (self.view.bounds.size.height)) {
if (![self isLoading]) {
[self loadNextPage];
}
}
}
@end
答案 0 :(得分：0)
您需要做的是将[self.tableView reloadData];添加到objectsDidLoad:的末尾。这将使用您更新的数据刷新UI。