tableview的一种缓存高度方法

@property(nonatomic,strong)NSMutableDictionary*heightAtIndexPath;//缓存高度所用字典

#pragma mark - UITableViewDelegate-(CGFloat)tableView:(UITableView*)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath*)indexPath{

NSNumber*height = [self.heightAtIndexPath objectForKey:indexPath];if(height) {returnheight.floatValue; }

else

{return100; }

}

• (void)tableView:(UITableView*)tableView willDisplayCell:(UITableViewCell*)cell forRowAtIndexPath:(NSIndexPath*)indexPath{

NSNumber*height = @(cell.frame.size.height); [self.heightAtIndexPath setObject:height forKey:indexPath];

}