Value stored to 'recordView' during its initialization is never read

用instruments做代码的静态分析时：

第一行的分析结果是：Value stored to 'recordView' during its initialization is never read

JoinRecordHeaderView *recordView = [tableViewdequeueReusableHeaderFooterViewWithIdentifier:@"JoinRecordHeaderView"];

recordView = [[[NSBundlemainBundle]
loadNibNamed:@"JoinRecordHeaderView"owner:selfoptions:nil]firstObject];

recordView.date =_joinSectionHeaderTitleAry[section -3];

有点诧异，什么叫“recordView存储的值在初始化过程中不会被读取”！

后来发现原来是没重用好，正确的代码应该是：

JoinRecordHeaderView *recordView = [tableViewdequeueReusableHeaderFooterViewWithIdentifier:@"JoinRecordHeaderView"];

if (!recordView) {

   recordView = [[[NSBundlemainBundle]
loadNibNamed:@"JoinRecordHeaderView"owner:selfoptions:nil]firstObject];

   recordView.date =_joinSectionHeaderTitleAry[section -3];

}

如果不用instruments分析，真不敢想象写出这么丢人的代码！

回到主题上来，没重用好，导致每次都重新加载并重新初始化recordView，导致instruments有这样的分析结果，这样的结果都能分析出来，instruments真是厉害的工具。