iOS SIGSEGV SEGV_ACCERR在layoutSubviews中坠毁
iOS SIGSEGV SEGV_ACCERR在layoutSubviews中坠毁
提问于 2014-10-09 08:22:36
我的应用程序有时会在layoutSubview方法中崩溃。当应用程序计算UITableViewCell的高度时，就会发生这种情况。有时应用程序崩溃，但并不总是如此。在这里，函数代码：
+ (CGFloat)heightForEditorialCommentData:(EditorialCommentVMData *)editorialData
{
EditorialCommentCell * cell = [EditorialCommentCell instanceCell];
[cell applyViewModelData:editorialData];
[cell layoutSubviews];
return cell.commentTextLabel.frameBottom + kTextInsets.bottom;
}
+ (EditorialCommentCell *)instanceCell {
static EditorialCommentCell *instance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
NSArray *views = [[NSBundle mainBundle] loadNibNamed: @"EditorialCommentCell" owner:0 options:0];
instance = views[0];
instance.frame = CGRectMake(instance.contentView.frame.origin.x,
instance.contentView.frame.origin.y,
[[UIScreen mainScreen] bounds].size.width,
instance.contentView.frame.size.height);
});
return instance;
}下面是堆栈跟踪：
Thread : Crashed: com.apple.root.default-qos
0 UIKit 0x2ff92b3a -[_UIViewAdditiveAnimationAction runActionForKey:object:arguments:] + 569
1 UIKit 0x2ff92cf5 __67-[_UIViewAdditiveAnimationAction runActionForKey:object:arguments:]_block_invoke + 408
2 QuartzCore 0x2f71e4c5 CA::Layer::end_change(CA::Transaction*, unsigned int, objc_object*) + 96
3 QuartzCore 0x2f71f06b CA::Layer::set_bounds(CA::Rect const&, bool) + 530
4 QuartzCore 0x2f71ed87 -[CALayer setBounds:] + 110
5 UIKit 0x3017f84f -[_UILabelLayer setBounds:] + 58
6 QuartzCore 0x2f71fe01 -[CALayer setFrame:] + 600
7 UIKit 0x3017f7eb -[_UILabelLayer setFrame:] + 58
8 UIKit 0x2fcfc4d7 -[UIView(Geometry) setFrame:] + 254
9 UIKit 0x2fd09f53 -[UILabel setFrame:] + 138
CRASH->10 MYAPP 0x000fb611 -[UIView(Frame) setFrameWidth:] (UIView+Frame.m:103)
11 MYAPP 0x00130c75 -[EditorialCommentCell layoutSubviews] (EditorialCommentCell.m:139)
12 MYAPP 0x001324ed +[EditorialCommentCell heightForEditorialCommentData:] (EditorialCommentCell.m:351)
13 MYAPP 0x00115733 -[EditorialCommentsViewModel applyDataFromItem:toVMItem:] (EditorialCommentsViewModel.m:298)
14 MYAPP 0x00114e73 -[EditorialCommentsViewModel vmDataFromItem:] (EditorialCommentsViewModel.m:222)
15 MYAPP 0x000fac29 -[FatherViewModel insertItemsUpdatingExisting:intoVMItems:] (FatherViewModel.m:418)
16 MYAPP 0x000f9cfd __39-[FatherViewModel updateItems:failure:]_block_invoke_3 (FatherViewModel.m:281)
17 libdispatch.dylib 0x3a4718cb _dispatch_call_block_and_release + 10
18 libdispatch.dylib 0x3a47ada3 _dispatch_root_queue_drain + 834
19 libdispatch.dylib 0x3a47bcd7 _dispatch_worker_thread3 + 94
20 libsystem_pthread.dylib 0x3a5d2e31 _pthread_wqthread + 668这里是我的layoutSubview代码：
- (void)layoutSubviews {
[super layoutSubviews]; // Sometimes crashed here
CGFloat contentLeft = kTextInsets.left;
BOOL isReply = self.editorialCommentData.inReplyToCommentId != 0;
if (isReply) {
contentLeft += kAuthorLeftInset + self.authorImageView.frameWidth;
}
self.authorImageView.frameOrigin = CGPointMake(contentLeft, kContentInsets.top);
self.votesLabel.frameWidth = 200; // Sometimes crashed here
[self.votesLabel sizeToFit];
self.votesLabel.frameTop = self.authorImageView.frameTop - 1.5f;
self.votesLabel.frameRight = self.contentView.bounds.size.width - kContentInsets.right;
<.....more code here.....>
}我认为这是内存管理问题。
Stack Overflow用户
回答已采纳
发布于 2014-10-09 08:41:09
好的!我修好了。马可对layoutSubviews方法的评论：“您不应该直接调用此方法。如果您想强制进行布局更新，请在下一次绘图更新之前调用setNeedsLayout方法。”我刚刚将layoutSubviews更改为layoutIfNeeded方法：
+ (CGFloat)heightForEditorialCommentData:(EditorialCommentVMData *)editorialData
{
EditorialCommentCell * cell = [EditorialCommentCell instanceCell];
[cell applyViewModelData:editorialData];
[cell layoutIfNeeded];
return cell.commentTextLabel.frameBottom + kTextInsets.bottom;
}来自苹果关于layoutIfNeeded的文档：
使用此方法在绘图前强制进行子视图的布局。使用接收消息的视图作为根视图，此方法从根开始布局视图子树。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/26273621
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