【发布时间】：2016-12-08 11:11:16
【问题描述】：
我有一个管理 UICollectionView 的 viewController。我有一个从 cellForItemAtIndexPath 调用的辅助方法，它为单元格中的标签提供 NSAttributedString。辅助方法从 html 字符串格式化 NSAttributedString。应用程序在移动到后台时会崩溃，但前提是 indexPath.item 大于 1。换句话说，我可以退出应用程序而不会从第一个或第二个单元格崩溃，但在第三个或第四个单元格始终崩溃。 .. 细胞。
这是我的辅助方法和堆栈跟踪。知道为什么我在退出应用程序时会崩溃吗？
#pragma mark - === Utility Methods === -
- (NSAttributedString *)stepDescriptionStringForIndexPath:(NSIndexPath *)indexPath {
NSString *headerString;
NSString *htmlString;
NSString *categoryString = [NSString stringWithFormat:@"Category: %@", self.knot.category.categoryName];
NSString *abokString = [NSString stringWithFormat:@"ABOK #: %@", self.knot.abokNumber];
NSMutableString *activitiesString = [NSMutableString stringWithCapacity:10];
[activitiesString appendString:@"Activities: "];
// build a string of activities to append to the description html
NSArray *activities = [self.knot.activities allObjects];
if ([activities count] > 0) {
int counter = 1;
for (Activity *activity in activities) {
[activitiesString appendString:activity.activityName];
if (counter < [activities count]) {
[activitiesString appendString:@", "];
}
counter ++;
}
}
// build an HTML string by concatinating the activities to the step description
// and add the header string
if(indexPath.item > 0){
Step *step = (Step *)self.steps[indexPath.item - 1];
headerString = [NSString stringWithFormat:@"Step %ld of %lu", (long)indexPath.item, (unsigned long)[self.steps count]];
htmlString =[NSString stringWithFormat:@"<p>%@</p>%@", headerString, step.stepDescription];
} else {
headerString = @"Overview";
htmlString = [NSString stringWithFormat:@"<p>%@</p>%@<p>%@</br>%@</br>%@</p>", headerString, self.knot.knotDescription, categoryString, abokString, activitiesString];
}
// convert the html string to an attributed string
NSMutableAttributedString *attrStringFromHTML = [[NSMutableAttributedString alloc] initWithData:[htmlString dataUsingEncoding:NSUTF8StringEncoding]
options:@{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
NSCharacterEncodingDocumentAttribute: [NSNumber numberWithInt:NSUTF8StringEncoding]}
documentAttributes:nil
error:nil];
// set the font for the body
NSRange totalRange;
totalRange.location = 0;
totalRange.length = attrStringFromHTML.length;
[attrStringFromHTML addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:16] range:totalRange];
// set the font for the header
NSString *temp = [attrStringFromHTML string];
NSRange headerRange = [temp rangeOfString:headerString];
NSRange categoryRange = [temp rangeOfString:categoryString];
NSRange abokRange = [temp rangeOfString:abokString];
NSRange activitiesRange = [temp rangeOfString:activitiesString];
[attrStringFromHTML addAttribute:NSFontAttributeName value:[UIFont boldSystemFontOfSize:18] range:headerRange];
//set the font for the activities paragraph
if(indexPath.item == 1){
[attrStringFromHTML addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:12] range:categoryRange];
[attrStringFromHTML addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:12] range:abokRange];
[attrStringFromHTML addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:12] range:activitiesRange];
}
return attrStringFromHTML;
}
【问题讨论】：
-
您是否尝试过设置断点并单步执行函数以确定崩溃的确切位置？
-
你有没有想过解决这个问题？目前我也遇到了同样的问题。
-
我也是——有什么更新吗？
-
有什么新东西吗？我也被这个打击了。
-
你解决了这个问题吗？发生在我身上同样的事情
标签： ios