按升序从下到上删除 tableView 行时删除了不正确的 tableView 行

问题描述

按升序（从下到上）删除tableView行时，正在删除所选行上方的错误行。例如，有以下四行：

A 乙 C

向左滑动删除D行时，C行被删除。

相反，当按降序（从上到下）删除时，没有任何问题，行将按正确的顺序删除。基本的删除代码如下，tableView 有两个部分（在两个部分中按升序删除时会出现问题）。任何建议，非常感谢！

let deleteAction = UIContextualAction(style: .destructive,title: NSLocalizedString("Delete",comment:"Delete")) { _,_,complete in
            let section = indexPath.section
            let row = indexPath.row
            let i = IndexPath(item: row,section: section)
           
            if section == 0 {
            
            self.cyclesteps.remove(at: row)
            self.tableView.deleteRows(at: [i],with: .automatic)
       
          
                
                let thesample = HKQuantityType.quantityType(forIdentifier: HKQuantityTypeIdentifier.distanceCycling)
                let thepredicate = HKQuery.predicateForObjects(from: HKSource.default())
                healthStore.deleteSamplesOfType(thesample!,predicate: thepredicate,withCompletion: { (success,count,error) -> Void in
                    dispatchQueue.main.async(execute: { () -> Void in
                       
                        if error == nil
                        {
                            // saved successfully
                           
                            //self.tableView.reloadRows(at: [i],with: .automatic)
                            
                        }
                        else
                        {
                            print("Error occured while saving to Health Kit: \(error!.localizedDescription)")
                            
                            
                        }
                    })
               })
                
            }

解决方法

强烈建议先删除数据库中的项目，然后在数据源中（成功）然后更新视图

let deleteAction = UIContextualAction(style: .destructive,title: NSLocalizedString("Delete",comment:"Delete")) { _,_,complete in
    
    guard indexPath.section == 0 else { complete(false) }
    let thesample = HKQuantityType.quantityType(forIdentifier: HKQuantityTypeIdentifier.distanceCycling)
    let thepredicate = HKQuery.predicateForObjects(from: HKSource.default())
    healthStore.deleteSamplesOfType(thesample!,predicate: thepredicate,withCompletion: { (success,count,error) -> Void in
       DispatchQueue.main.async { 
               
           if let error = error {
                print("Error occured while saving to Health Kit: \(error.localizedDescription)")  
                complete(false)                          
           } else {
                // saved successfully
                   
                self.cyclesteps.remove(at: indexPath.row)
                self.tableView.deleteRows(at: [indexPath],with: .automatic)
                complete(true)
           }
       }
   })                
}

并且不要忘记调用操作的 complete 处理程序。