UITableView委托方法

Question

I'm trying to adjust the height of only the last row of a table view. I seem to be encountering some sort of recursive loop when trying to find the index of the last row. In my heightForRowAtIndexPath: method I have the following:

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
CGFloat height = 60;

    NSInteger lastSectionIndex = [tableView numberOfSections] - 1;
    NSInteger lastRowIndex = [tableView numberOfRowsInSection:lastSectionIndex] - 1;  // BLOWS UP!

    if ((indexPath.section == lastSectionIndex) && (indexPath.row == lastRowIndex)) {
        height = 44;
    }

    return height;
}

If I tweak the code a just a little, it works.

NSInteger lastRowIndex = [self tableView:tableView numberOfRowsInSection:lastSectionIndex] - 1;  // WORKS!

Can any Objective-C/iOS gurus shine some light as to what's going on here? Why does one syntax work over the other? Aren't they the exact same method?

You can check out the code here for context: https://github.com/phungkytown/chapter8_gold

Any help is greatly appreciated!

Answer 1

我建议不要使用tableView委托来获取节数和行数，而应直接从数据源获取此信息。