// 根據(jù)內(nèi)容自適應(yīng)單元格的高度
//先得到內(nèi)容
NSDictionary *dic=self.allDataArray[indexPath.row];
NSString *contentStr=[dic objectForKey:@"content"];
CGRect rect=[contentStr boundingRectWithSize:CGSizeMake(self.view.frame.size.width-40, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:17]} context:nil];
//當(dāng)內(nèi)容自適應(yīng)時(shí)需要將行數(shù)設(shè)置為0
_contentLable.numberOfLines=0;
