开始的时候按钮事件中，可能写的是这样一段代码：
if (isexpand) {
[lblbrief setnumberoflines:2];
lblbrief.text = [stringutil substring:strbrief andsublength:90];
[btnbrief setimage:[uiimage imagenamed:@detailbriefdown] forstate:uicontrolstatenormal];
[btnbrief setimage:[uiimage imagenamed:@detailbriefdown] forstate:uicontrolstatehighlighted];
}else{
[lblbrief setnumberoflines:0];
lblbrief.text = strbrief;
[btnbrief setimage:[uiimage imagenamed:@detailbriefup] forstate:uicontrolstatenormal];
[btnbrief setimage:[uiimage imagenamed:@detailbriefup] forstate:uicontrolstatehighlighted];
}
可以通过setnumberoflines:0,来让概述的所以内容显示出来，但如果，不计算所要显示全部内容的总高度，label的宽高是不会自动增大的。
else{
[lblbrief setnumberoflines:0];
lblbrief.text = strbrief;
cgsize constraint = cgsizemake(self.view.frame.size.width - (15 * 2), 20000.0f);
cgsize size = [strbrief sizewithfont:[uifont systemfontofsize:10]constrainedtosize:constraint linebreakmode:uilinebreakmodewordwrap];
[brief setframe:cgrectmake(15,160,size.width,size.height)];
[btnbrief setimage:[uiimage imagenamed:@detailbriefup]forstate:uicontrolstatenormal];
[btnbrief setimage:[uiimage imagenamed:@detailbriefup]forstate:uicontrolstatehighlighted];
}
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