Implement heightForRowIndexPath: in iOS 7, but remove it in iOS 8 using compile-time macro

问题

I'd like to implement the new auto-resizing table view cells in iOS 8, while maintaining support for heightForRowAtIndexPath: in iOS 7. The problem is I have to remove the method override heightForRowAtIndexPath: for iOS 8, but keep in it for iOS 7. Is there some compile-time macro to use that will accomplish this?

回答1:

You can not use a compile time macro because this is a run time decision. Instead, you can just return UITableViewAutomaticDimension for iOS 8 and if not, return your calculated height value.

#define IS_IOS_8_OR_LATER ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)

-(CGFloat) tableView: (UITableView * ) tableView heightForRowAtIndexPath: (NSIndexPath * ) indexPath {
  if (IS_IOS_8_OR_LATER)
    return UITableViewAutomaticDimension;
  else {
    //Your iOS 7 code here.
  }

}

来源：https://stackoverflow.com/questions/25965039/implement-heightforrowindexpath-in-ios-7-but-remove-it-in-ios-8-using-compile