iOS在tableView单元格中计算文本高度 [英] iOS calculate text height in tableView cell

问题描述

我目前正在开发一款应用，它会在tableview中显示一些推文。在故事板上我创建了一个原型单元格，其中包含了一条推文条目的基本gui概念。

i'm currently developing on an app, which displays some tweets in a tableview. On the storyboard i created a prototype-cell, which includes the basic gui concept of a tweet entry.

看起来大概是这样的：

++++++++++++++
++Username++++
++++++++++++++
++Tweet+++++++
++++++++++++++
++Time-Ago++++
++++++++++++++

现在我用以下代码计算单元格的高度但不知怎的，它失败了。

Now i'm calculating the height of the cell with the following code, but somehow it fails.

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    NSDictionary * currentTweet = [tweetArray objectAtIndex: indexPath.row];
    NSString * tweetTextString = [currentTweet objectForKey: @"text"];
    CGSize textSize = [tweetTextString sizeWithFont:[UIFont systemFontOfSize:15.0f] constrainedToSize:CGSizeMake(630, 1000) lineBreakMode: NSLineBreakByWordWrapping];

    float heightToAdd = 24 + textSize.height + 15 + 45;
    if(heightToAdd < 90) {
        heightToAdd = 90;
    }

    return heightToAdd;
}

顺便说一下，还有其他的东西，很奇怪。如果我滚动tableview，整个应用程序似乎冻结。这是正常的还是我做错了什么？

By the way, there is something other, which is strange. If i scroll the tableview the whole app seems to freeze. Is this normal or am i doing something wrong?

推荐答案

试试这个问题：

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {

    NSDictionary * currentTweet = [tweetArray objectAtIndex: indexPath.row];

    NSString * tweetTextString = [currentTweet objectForKey: @"text"];

    CGSize textSize = [tweetTextString sizeWithFont:[UIFont systemFontOfSize:15.0f] constrainedToSize:CGSizeMake(240, 20000) lineBreakMode: UILineBreakModeWordWrap]; //Assuming your width is 240

    float heightToAdd = MIN(textSize.height, 100.0f); //Some fix height is returned if height is small or change it to MAX(textSize.height, 150.0f); // whatever best fits for you

    return heightToAdd;
}

希望有所帮助。

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