Usage Bond batchUpdate

Bond.batchUpdate.swift

import UIKit
import Bond

class ViewController: UIViewController {

    let items: MutableObservableArray<String> = MutableObservableArray<String>([])
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        var batchBeginning = false
        _ = items.skip(first: 1).observeNext { (items) in
            let block = {
                debugPrint("change: \(items.change), items: \(self.items.array)")
                debugPrint("refresh実行")
            }
            
            switch items.change {
            case .beginBatchEditing:
                batchBeginning = true
            case .endBatchEditing:
                block()
                batchBeginning = false
            default:
                if !batchBeginning {
                    block()
                }
            }
        }
        
        debugPrint("=== 通常実行 ===")
        items.append("a")
        
        debugPrint("=== バッチ実行 ===")
        items.batchUpdate { (a) in
            a.append("1")
            a.append("2")
            a.append("3")
        }
    }
}

result.txt

"=== 通常実行 ==="
"change: inserts([0]), items: [\"a\"]"
"refresh実行"
"=== バッチ実行 ==="
"change: endBatchEditing, items: [\"a\", \"1\", \"2\", \"3\"]"
"refresh実行"