Swift 2.0 转换问题 NSFetchedResultsController didChangeObject

Posted 2023-03-04

【中文标题】Swift 2.0 转换问题 NSFetchedResultsController didChangeObject

【英文标题】：Swift 2.0 convert issue NSFetchedResultsController didChangeObject

【发布时间】：2015-09-23 10:30:41

【问题描述】：

在 Swift 2.0 中转换后，我无法解决问题：

"Objective-C方法 '控制器：didChangeObject：atIndexPath：forChangeType：newIndexPath：' 方法提供 '控制器(:didChangeObject:atIndexPath:forChangeType:newIndexPath:)' 与可选要求方法冲突 '控制器(:didChangeObject:atIndexPath:forChangeType:newIndexPath:)' 在协议“NSFetchedResultsControllerDelegate”中”

请帮助我。 并提前感谢

func controllerWillChangeContent(controller: NSFetchedResultsController) 
    tableView.beginUpdates()


func controller(controller: NSFetchedResultsController, didChangeObject anObject: NSManagedObject, atIndexPath indexPath: NSIndexPath?, forChangeType type: NSFetchedResultsChangeType, newIndexPath: NSIndexPath?) 

    // the issue is here

    switch type 

    case NSFetchedResultsChangeType.Insert:
        if let newIndex = newIndexPath 
            tableView.insertRowsAtIndexPaths([newIndex], withRowAnimation: UITableViewRowAnimation.Automatic)
        

    case NSFetchedResultsChangeType.Delete:
        if let index = indexPath 
            tableView.deleteRowsAtIndexPaths([index], withRowAnimation: UITableViewRowAnimation.Automatic)
        
    


func controllerDidChangeContent(controller: NSFetchedResultsController) 
    tableView.endUpdates()

【问题讨论】：

签名现在是didChangeObject anObject: AnyObject?

迈克·波拉德 - 谢谢！！！

【参考方案1】：

将呼叫 didChangeObject anObject: NSManagedObject 更改为 didChangeObject anObject: AnyObject。新方法如下所示：

func controller(controller: NSFetchedResultsController, didChangeObject anObject: AnyObject, atIndexPath indexPath: NSIndexPath?, forChangeType type: NSFetchedResultsChangeType, newIndexPath: NSIndexPath?) 

NSFetchedResultsController delegate methods