【发布时间】：2011-10-14 10:32:02
【问题描述】：
我正在以编程方式实现表视图，其中我将 (NSIndexPath) 类型的 mSelectedSubUnitIndex 属性设置为非原子并在 .m 中保留和合成。当我加载我的 tableviewcontroller 然后方法：
(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath
:(NSIndexPath *)indexPath
{
CGFloat height = 0.0;
SubUnit *subUnit = (SubUnit*)[mSubUnitsArray objectAtIndex:indexPath.row];
NSArray *subUnitExercises = [self sortArray:[subUnit.subUnitExercise allObjects]];
NSLog(@"mSelectedSubUnitIndex.row........%d",mSelectedSubUnitIndex.row);
NSLog(@"subUnitExercises........%d",[subUnitExercises count]);
if (indexPath.row == mSelectedSubUnitIndex.row && [subUnitExercises count]>1) {
height =CELL_EXPAND_HEIGHT ;
}
else {
height = CELL_NORMAL_HEIGHT;
}
return height;
}
运行良好。当我从其他控制器返回到我的 tableviewcontoller 时，它会在 NSLog 的第 5 行的相同方法处崩溃（发送对象消息），并在 [self.tableView reloadData];. It is resolved by commenting[self.tableView reloadData]; 处的方法处给出异常。
-(void)viewDidAppear:(BOOL)animated
{
DebugLog(@"start");
//[self.tableview reloadData];
execountarray=[[NSMutableArray alloc]init];
for(int k=0;k<[mSubUnitsArray count];k++)
{
SubUnit *subUnit = (SubUnit*)[mSubUnitsArray objectAtIndex:k];
NSArray *subUnitExercises = [subUnit.subUnitExercise allObjects];
[execountarray addObject:[NSString stringWithFormat:@"%d",[subUnitExercises
count]]];
}
///////////////
if (managedObjectContext){
NSFetchRequest *request = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription
entityForName:@"TSubUnitExerciseProgress" inManagedObjectContext:managedObjectContext];
[request setEntity:entity];
// Order the events by creation date, most recent first.
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc]
initWithKey:@"editDate" ascending:YES];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor,
nil];
[request setSortDescriptors:sortDescriptors];
[sortDescriptor release];
[sortDescriptors release];
// Execute the fetch -- create a mutable copy of the result.
NSError *error = nil;
NSMutableArray *mutableFetchResults = [[managedObjectContext
executeFetchRequest:request error:&error] mutableCopy];
if (mutableFetchResults == nil) {
// Handle the error.
myNotes = nil;
[myNotes removeAllObjects];
}
else
{
[myNotes setArray: mutableFetchResults];
}
//NSLog(@"My notes count:--------unitviewcontroller--------------->%d",
[myNotes count]);
if([myNotes count] ==0)
{
setExer1Done:NO;
setExer2Done:NO;
}
else
{
NSLog(@"hey :P");
}
}
// [self.tableview reloadData];
}
didSelectRowAtIndex
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath
*)indexPath
{
DebugLog(@" -start- \n");
mSelectedSubUnitIndex = indexPath;
SubUnit *subUnit = (SubUnit*)[mSubUnitsArray objectAtIndex:indexPath.row];
NSArray *subUnitExercises = [self sortArray:[subUnit.subUnitExercise allObjects]];
if([subUnitExercises count]!=1)
{
NSArray* paths = [NSArray arrayWithObject:[NSIndexPath indexPathForRow:
[mSelectedSubUnitIndex row] inSection:0]];
[tableview beginUpdates];
[tableview deleteRowsAtIndexPaths:paths
withRowAnimation:UITableViewRowAnimationFade];
[tableview insertRowsAtIndexPaths:paths
withRowAnimation:UITableViewRowAnimationFade];
[tableview endUpdates];
}
else
{
//SubUnit *subUnit = (SubUnit*)[mSubUnitsArray objectAtIndex:
[mSelectedSubUnitIndex row]];
SubUnit *subUnit = (SubUnit*)[mSubUnitsArray objectAtIndex:indexPath.row];
NSArray *subUnitExercises = [self sortArray:[subUnit.subUnitExercise
allObjects]];
if ([subUnitExercises count] > 0) {
SubUnitExercise *subUnitExercise = [subUnitExercises
objectAtIndex:0];
[self loadSubUnitExercise:subUnitExercise];
}
}
}
这是在 iOS 4 上运行的，但是当我通过 Xcode 4.2 版和 iOS 5（2011 年 10 月 12 日发布）构建时，它会崩溃。无法弄清楚问题所在。帮帮我！！
cellForRowAtIndex 方法
现在，当我滚动时，我在 mSelectedsubunitindex.row 的 if 语句中遇到异常，但我解决了只检查 if (indexPath.row){}，并且当我返回到我的 tableview 控制器时，行保持选中状态
- (void)tableView:(UITableView *)tableView willDisplayCell:
(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
DebugLog(@"-start- \n");
SubUnit *subUnit = (SubUnit*)[mSubUnitsArray objectAtIndex:indexPath.row];
NSArray *subUnitExercises = [self sortArray:[subUnit.subUnitExercise allObjects]];
NSString *str1 = [[subUnit performSelector:@selector(title)]copy];
if ([str1 isEqualToString:@"1. was/were"])
{
global = str1;
}
//if(indexPath.row==mSelectedSubUnitIndex.row)
if(indexPath.row)
{
if ([subUnitExercises count] != 1)
{
SubUnit *subUnit = (SubUnit*)[mSubUnitsArray objectAtIndex:
[mSelectedSubUnitIndex row]];
NSArray *subUnitExercises = [self sortArray:
[subUnit.subUnitExercise allObjects]];
SubUnitCell *subUnitcell = (SubUnitCell*) cell;
mCellSubTopicLabel.text = subUnit.title;
if([myNotes count] == 0)
{
NSNumber *isDone = [[subUnitExercises objectAtIndex:1] isDone];
[subUnitcell setExer2Done:NO];
mExer2Checkbox.image = [UIImage imageNamed:[isDone boolValue]?
kExerciseCheckmark :kExerciseWrongmark];
isDone = [[subUnitExercises objectAtIndex:0] isDone];
[subUnitcell setExer1Done:NO];
mExer1Checkbox.image = [UIImage imageNamed:[isDone boolValue]?
kExerciseCheckmark :kExerciseWrongmark];
}
else
{
NSNumber *isDone = [[subUnitExercises objectAtIndex:1] isDone];
[subUnitcell setExer2Done:[isDone boolValue]];
mExer2Checkbox.image = [UIImage imageNamed:[isDone boolValue]?
kExerciseCheckmark :kExerciseWrongmark];
isDone = [[subUnitExercises objectAtIndex:0] isDone];
[subUnitcell setExer1Done:[isDone boolValue]];
mExer1Checkbox.image = [UIImage imageNamed:[isDone boolValue]?
kExerciseCheckmark :kExerciseWrongmark];
}
[subUnitcell.contentView addSubview:mCellSubTopicContentView];
}
}
【问题讨论】：
-
什么样的崩溃？你能发布堆栈跟踪吗？
-
@RoboticCat：是的，当然！但所有这些代码也在 iOS 4 和 3 中运行
-
你也可以发布 cellForRowAtIndexPath 方法吗？堆栈跟踪也没有帮助 - 你可以添加符号化的崩溃日志吗？
-
@RoboticCat：好的，我正在发布 cellForRowAtIndexPath 方法。