问题描述
当我将表中的行数设置为零时,我的UITableView会出现一致的崩溃。它因EXC_BAD_ACCESS错误而崩溃。崩溃是UITableView的内部,所以我不能直接看到出了什么问题,虽然这对我来说应该是一个愚蠢的错误。
I am having a consistent crash with my UITableView when I set the number of rows in the table to zero. It crashes with an EXC_BAD_ACCESS error. The crash is internal to the UITableView, so I cannot directly see what went wrong, though it should be a stupid mistake on my part.
堆栈跟踪如下:
#0 0x0194ca60 in objc_msgSend ()
#1 0x00656837 in -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:withIndexPath:] ()
#2 0x0064c77f in -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:] ()
#3 0x00661450 in -[UITableView(_UITableViewPrivate) _updateVisibleCellsNow:] ()
#4 0x00659538 in -[UITableView layoutSubviews] ()
#5 0x00d39451 in -[CALayer layoutSublayers] ()
#6 0x00d3917c in CALayerLayoutIfNeeded ()
#7 0x00d3237c in CA::Context::commit_transaction ()
#8 0x00d320d0 in CA::Transaction::commit ()
#9 0x00d627d5 in CA::Transaction::observer_callback ()
#10 0x013a3fbb in __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ ()
#11 0x013390e7 in __CFRunLoopDoObservers ()
#12 0x01301bd7 in __CFRunLoopRun ()
#13 0x01301240 in CFRunLoopRunSpecific ()
#14 0x01301161 in CFRunLoopRunInMode ()
#15 0x01d42268 in GSEventRunModal ()
#16 0x01d4232d in GSEventRun ()
#17 0x005f142e in UIApplicationMain ()
#18 0x000518ec in main (argc=1, argv=0xbfffef84) at /Users/megahub/xcode/QuamSec/main.m:15
我的代码如下:
- (id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
m_oPositionTableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, 320, 367) style:UITableViewStylePlain];
m_oPositionTableView.delegate = self;
m_oPositionTableView.dataSource = self;
m_oPositionTableView.separatorStyle = UITableViewCellSeparatorStyleNone;
[self addSubview:m_oPositionTableView];
m_oAppDelegate = (AyersGTSAppDelegate *)[[UIApplication sharedApplication] delegate];
}
return self;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// Return the number of rows in the section.
if (m_oPositionItems == nil)
return 0;
else
return [m_oPositionItems count];
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"QuamPortfolioPositionCell";
QuamPortfolioPositionCell *cell = (QuamPortfolioPositionCell *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[NSBundle mainBundle] loadNibNamed:@"QuamPortfolioPositionCell" owner:self options:nil] lastObject];
}
// Configure the cell...
SPPositionItem *oPositionItem = [m_oPositionItems objectAtIndex:indexPath.row];
cell.oSymbol.text = oPositionItem.sProdCode;
cell.oMktPrice.text = oPositionItem.sMktPrice;
cell.oNet.text = oPositionItem.sNet;
cell.oAmount.text = oPositionItem.sMktVal;
return cell;
}
只有当表中的行数为0时才会发生崩溃。我将返回的行数硬编码为1,不会出现崩溃。
The crash only happens when the number of rows in the table is 0. If I hardcode the number of rows returned to 1, the crash does not appear.
推荐答案
原来我忘了退回一张桌子先前初始化函数中的单元格。现在全部修好了。
Turns out that I forgot to return a table cell in a previous initialization function. All fixed now.
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