Swift项目中使用Instructions框架实现多按钮引导的逻辑优化问题

你不需要自定义状态变量来判断当前展示的是第几个引导，Instructions框架的coachMarkAt代理方法传入的index参数本身就是当前引导项的序号（从0开始计数），直接基于这个参数做分支判断即可。

具体实现步骤 #

1. 首先实现返回引导总数量的数据源方法，告诉框架你需要展示2个引导项：

func numberOfCoachMarks(for coachMarksController: CoachMarksController) -> Int {
    return 2
}

2. 改写引导项生成的代理方法，直接用index判断对应绑定的视图：

func coachMarksController(_ coachMarksController: CoachMarksController, coachMarkAt index: Int) -> CoachMark {
    switch index {
    case 0:
        return coachMarksController.helper.makeCoachMark(for: view_schedule)
    case 1:
        return coachMarksController.helper.makeCoachMark(for: use_now)
    default:
        return coachMarksController.helper.makeCoachMark(for: use_now)
    }
}

方案优势 #

• 无需维护自定义状态变量，彻底避免状态管理不当导致的逻辑错误
• 代码结构清晰易读，后续新增引导项只需增加对应case分支即可，维护成本极低
• 完全符合框架本身的设计规范，不会出现时序错乱的问题

如果需要为不同引导项配置不同的提示文案、按钮文本，也可以通过index参数做分支判断实现，示例如下：

func coachMarksController(_ coachMarksController: CoachMarksController, coachMarkViewsAt index: Int, madeFrom coachMark: CoachMark) -> (bodyView: CoachMarkBodyView, arrowView: CoachMarkArrowView?) {
    let coachViews = coachMarksController.helper.makeDefaultCoachViews(withArrow: true, arrowOrientation: coachMark.arrowOrientation)
    switch index {
    case 0:
        coachViews.bodyView.hintLabel.text = "点击查看日程安排"
        coachViews.bodyView.nextLabel.text = "下一步"
    case 1:
        coachViews.bodyView.hintLabel.text = "点击立即启用设备"
        coachViews.bodyView.nextLabel.text = "完成"
    default: break
    }
    return (coachViews.bodyView, coachViews.arrowView)
}

内容的提问来源于stack exchange，提问作者user