我有一个正在初始化的VC,其中是View
。在View
中是UITableView
,UIButton
和UIImage
。
突然,我被按钮属性搞砸了:
Assertion failure in -[UITableView _createPreparedCellForGlobalRow:withIndexPath:]
经过进一步的挖掘,这是因为我的代码:
UINib *animCellNib = [UINib nibWithNibName:@"IoUISEAnimationDetailListingCell" bundle:nil];
[animationDetailsTableView registerNib:animCellNib forCellReuseIdentifier:@"AnimationDetailListingCell"];
没有被执行。我的
viewDidLoad
方法的顶部进行了进一步的挖掘,发现它跳至初始化tableView
。因此,从我的方法名称跟踪中,您可以看到它以numberOfSectionsInTableView
开头。虽然这只发生在我的viewDidLoad
中几行2011-10-12 15:43:42.113 io[5052:11903] <IoUISEAnimationDetailsViewController: 0x764c460> - initWithNibName:bundle:
2011-10-12 15:43:42.116 io[5052:11903] <IoUISEAnimationDetailsViewController: 0x764c460> - viewDidLoad
Current language: auto; currently objective-c
2011-10-12 15:43:49.017 io[5052:11903] <IoUISEAnimationDetailsViewController: 0x764c460> - numberOfSectionsInTableView:
2011-10-12 15:43:49.017 io[5052:11903] <IoUISEAnimationDetailsViewController: 0x764c460> - tableView:titleForHeaderInSection:
2011-10-12 15:43:49.017 io[5052:11903] <IoUISEAnimationDetailsViewController: 0x764c460> - tableView:titleForFooterInSection:
2011-10-12 15:43:49.017 io[5052:11903] <IoUISEAnimationDetailsViewController: 0x764c460> - tableView:numberOfRowsInSection:
2011-10-12 15:43:49.017 io[5052:11903] <IoUISEAnimationDetailsViewController: 0x764c460> - tableView:cellForRowAtIndexPath:
2011-10-12 15:43:49.017 io[5052:11903] *** Assertion failure in -[UITableView _createPreparedCellForGlobalRow:withIndexPath:], /SourceCache/UIKit_Sim/UIKit-1912.3/UITableView.m:6072
2011-10-12 15:43:49.018 io[5052:11903] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UITableView dataSource must return a cell from tableView:cellForRowAtIndexPath:'
在
viewDidLoad
方法中,在我设置saveButton.titleLabel.lineBreakMode
之后但在saveButton setBackgroundImage:newImage
之前的某个时候,它会跳转到numberOfSectionsInTableView
方法。由于我的
registerNib: forCellReuseIdentifier:
代码在按钮代码之后,因此单元格nib未注册,因此导致我的dequeueReusableCellWithIdentifier
返回nil并崩溃。为什么会这样呢?
这是
viewDidLoad
的代码:- (void)viewDidLoad {
if (IoUIDebug & IoUIDebugSelectorNames) {
NSLog(@"%@ - %@", [self description], NSStringFromSelector(_cmd) );
}
[super viewDidLoad];
// Create an Empty Tableview and steal its Background.
//set our background to it
UITableView *tv = [[UITableView alloc] initWithFrame:self.view.frame style:UITableViewStyleGrouped];
UIView *backgroundView = tv.backgroundView;
[self.view addSubview:backgroundView];
[tv release];
// CGRect backgroundFrame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
//[backgroundView setFrame:backgroundFrame];
[self.view sendSubviewToBack:backgroundView];
saveButton.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
saveButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;
saveButton.titleLabel.textAlignment = UITextAlignmentCenter;
saveButton.titleLabel.lineBreakMode = UILineBreakModeCharacterWrap;
[saveButton setTitle:NSLocalizedStringFromTable(@"Save Animation Label",@"ScreenEditor",@"Save Animation Label") forState:UIControlStateNormal];
[saveButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
saveButton.titleLabel.font = [UIFont boldSystemFontOfSize:17];
UIImage *newImage = [[UIImage imageNamed:@"BlueButtonSmall.png"] stretchableImageWithLeftCapWidth:12.0 topCapHeight:0.0];
[saveButton setBackgroundImage:newImage forState:UIControlStateNormal];
UIImage *newPressedImage = [[UIImage imageNamed:@"BlueButtonSmallPressed.png"] stretchableImageWithLeftCapWidth:12.0 topCapHeight:0.0];
[saveButton setBackgroundImage:newPressedImage forState:UIControlStateHighlighted];
// in case the parent view draws with a custom color or gradient, use a transparent color
saveButton.backgroundColor = [UIColor clearColor];
if (UIAppDelegate.ioMainViewController.currentDeployment.readOnlyMode == NO) { // Only setup for the long press if the deployment is editable..
instructionLabel.text = NSLocalizedStringFromTable(@"Animation Details Instructions", @"ScreenEditor", @"");
} else {
instructionLabel.text = NSLocalizedStringFromTable(@"Locked Message", @"Configuration",@"");
}
IoCDElementAnimation * currentAnimation = UIAppDelegate.ioMainViewController.currentElementAnimation;
if (currentAnimation) {
newAnimation = currentAnimation;
selectedSysCDAnimation = currentAnimation.sysAnimation;
selectedIoCDTag = currentAnimation.tag;
animationSaved = YES;
} else {
selectedSysCDAnimation = nil;
selectedIoCDTag = nil;
animationSaved = NO;
}
UINib *animCellNib = [UINib nibWithNibName:@"IoUISEAnimationDetailListingCell" bundle:nil];
[animationDetailsTableView registerNib:animCellNib forCellReuseIdentifier:@"AnimationDetailListingCell"];
// set our TableView Background to clear so we can see our new background
[animationDetailsTableView setBackgroundView:nil];
[animationDetailsTableView setBackgroundColor:[UIColor clearColor]];
[self refreshContents:nil];
[self setupOrientation:[[UIApplication sharedApplication] statusBarOrientation]];
[self.view setNeedsLayout];
}
在此方法中,
dequeueReusableCellWithIdentifier:
返回nil。找不到AnimationDetailListingCell标识符,因为registerNib
中的viewDidLoad
代码尚未运行。似乎所有viewDidLoad
都应该在它爆发之前初始化表视图,对吧?- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
if (IoUIDebug & IoUIDebugSelectorNames) {
NSLog(@"%@ - %@", [self description], NSStringFromSelector(_cmd) );
}
UITableViewCell *cell;
cell = [animationDetailsTableView dequeueReusableCellWithIdentifier:@"AnimationDetailListingCell"];
// cell at this point in nil!
[self configureCell:cell atIndexPath:indexPath];
return cell;
}
最佳答案
我有同样的错误。我认为这是因为调整某些按钮属性意味着需要设置视图(显然是延迟创建的),这意味着表需要准备就绪,并且尚未准备就绪,也许是因为尚未连接其数据源或者其他的东西。尝试将按钮调整移至更高的viewDidLoad方法中。对我有用。
关于ios - UITableView是否在viewDidLoad中间初始化?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/7747679/