On an iPhone, how do you figure out the width of a table view cell’s content view when it is showing a certain accessory view (disclosure indicator, etc)?
I need this in order to calculate the correct cell height for cells that contain wrapping, variable-length text. But when the table view delegate is asked for a cell height, it doesn’t actually have the actual cell instance, so it can’t just query the content view bounds directly.
I can easily hard-code a 20-pixel margin on the right which appears to be accurate for a plain style table view in portrait orientation with a disclosure indicator, but would prefer to do it the Right Way so that it keeps working if Apple decides to tweak the margin.
(This is related to this question.)
Personally, I would just hard code the values — simpler and things will break in a predictable way.
But were I to do this programmatically, I would create a UITableViewCell, set up the editing properties / accessory views you need to measure, and then ask it how big its contentView is.
Of course I would probably heavily cache this — doing allocations when asking UITableView asks you for height information sounds to me like it would be slow (check with a profiler first though, as always).