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iOS崩溃报告"意外启动状态"异常？

我找到了几个崩溃报告的原因unexpected start state.我的代码看起来像这样:

NSRange range = [content rangeOfString:@"<html>"];

if (range.location != NSNotFound) {
    NSString *htmlStr = [content substringFromIndex:range.location];

    NSAttributedString *attStr = [[NSAttributedString alloc] initWithData:[htmlStr dataUsingEncoding:NSUnicodeStringEncoding] options:@{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType} documentAttributes:nil error:nil];

    return attStr.string;
}

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崩溃报告如下所示: