带标签的UITableViewCell动态高度 [英] UITableViewCell dynamic height with label

问题描述

我用NIB文件创建了一个UITableViewCell.其中有1个标签将包含一条推文.因此，它必须是一个动态高度.在tweet标签下方还必须有一个timeAgo标签.

I have created a UITableViewCell with a NIB file. There is 1 label in it which is going to contain a tweet. So it needs to be a dynamic height. There also is a timeAgo label that has to fit underneath the tweet label.

我正在尝试与帧大小一样的东西，但我无法找到完美的解决方案.我在drawrect方法的UITableViewCell文件中执行此操作.

I'm trying stuff with frames en sizes but I can't get the perfect solution.. I do this in the UITableViewCell file in the drawrect method.

self.tweet.lineBreakMode = UILineBreakModeWordWrap;
self.tweet.numberOfLines = 0;
self.tweet.font = [UIFont fontWithName:@"Arial" size:13.0f];
[self.tweet sizeToFit];  

CGFloat tweetHeight = self.tweet.frame.size.height;

self.timeAgo.lineBreakMode = UILineBreakModeWordWrap;
self.timeAgo.numberOfLines = 0;
self.timeAgo.font = [UIFont fontWithName:@"Arial" size:11.0f];
[self.timeAgo sizeToFit];

CGFloat timeAgoHeight = self.timeAgo.frame.size.height;

self.timeAgo.frame = CGRectMake(88, tweetHeight, 100, timeAgoHeight + 10.0f);

我还尝试了在教程中找到的stringhelper.

I have also tried a stringhelper which I found in a tutorial.

该:

- (CGFloat)RAD_textHeightForSystemFontOfSize:(CGFloat)size {

我的HeightForRow方法也已经不同，因为我使用了不同的单元格样式.此刻，我为每种单元格样式返回一个硬值，但还需要更改为单元格高度.

My HeightForRow methods is also already different because I use different cell styles. At the moment I return a hard value for each cell style but that also needs to change to the cellheight.

推荐答案

请参阅本教程， http://www.cimgf.com/2009/09/23/uitableviewcell-dynamic-height/

窍门是使标签随着单元格的大小而增长，而不是您可以设置单元格的大小，并且单元格将随其增长.

The trick is to make the label grow with the size of the cell, than you can just set the size of the cell and the cell will grow with it.

设置timeAgo标签以使其自身与单元格底部对齐.

Set the timeAgo label to align it self to the bottom of the cell.

通过IB将tweet的numberOfLines设置为0，移走所有绘制代码​​，仅执行以下操作:

Set the numberOfLines of tweet to 0 via IB,re move all the draw code and only implement the following:

- (CGFloat) tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    id item  = [self.item objectAtIndex:indexpath.row];

    CGFloat height = 85.0f;

    if ([item isKindOfClass:[Tweet class]]) {
        Tweet *tweet = (Tweet *)item;
        CGSize titleSize = [tweet.tweet sizeWithFont:[UIFont fontWithName:@"Arial" size:13.0f] constrainedToSize:CGSizeMake(260.0f, MAXFLOAT)];

        // adde the 24 pixels to get the height plus the time ago label.
        height =  titleSize.height + 24.0f;

    } else if( [item isKinfOfClass:[SC_Release class]]) {
        height = 65.0f;
    }

   return height;
}

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