如何知道动作(SKAction.repeat，count)何时结束

let action = SKAction.sequence([
    // 要重复执行的动作序列
    SKAction.moveBy(x: 100, y: 0, duration: 1.0),
    SKAction.wait(forDuration: 0.5)
])

let repeatAction = SKAction.repeat(action, count: 3)

let completionAction = SKAction.run {
    // 动作结束后的处理逻辑
    print("动作结束")
}

let sequence = SKAction.sequence([repeatAction, completionAction])

// 运行动作序列
node.run(sequence)

let action = SKAction.moveBy(x: 100, y: 0, duration: 1.0)
let repeatAction = SKAction.repeat(action, count: 3)

let waitDuration = action.duration * Double(repeatAction.count)
let waitAction = SKAction.wait(forDuration: waitDuration)

let completionAction = SKAction.run {
    // 动作结束后的处理逻辑
    print("动作结束")
}

let sequence = SKAction.sequence([repeatAction, waitAction, completionAction])

// 运行动作序列
node.run(sequence)