在首次启动项目时,需求常常会要求你在特定的位置添加说明图,以帮助新用户更好使用 App ,这些说明图又叫引导图,本文称之为 tips.

public class TipsView:UIView {
  /**
   创建Tips
   - parameter imageStr:        tips 图片
   - parameter hasCloseBtn:     是否有关闭按钮 **将会创建在 tips 右上角**
   - parameter hasCloseGesture: 是否有点击 tips 的关闭手势
   - parameter key:             标注 tips 的 key **唯一存在**
   */
  func showTips(imageStr:String,hasCloseBtn:Bool,hasCloseGesture:Bool,key:String){
    if !NSUserDefaults.standardUserDefaults().boolForKey(key) {
      //判断是否是第一次创建
      NSUserDefaults.standardUserDefaults().setBool(true, forKey: key) 
      //tips图片
      let tipsImageView = UIImageView.init(frame: CGRectMake(0, 0, self.frame.width, self.frame.height))
      tipsImageView.image = UIImage(named: imageStr)
      self .addSubview(tipsImageView)
      //关闭按钮
      if hasCloseBtn {
        let closeTipsBtn = UIButton(type:.Custom)
        closeTipsBtn.frame = CGRectMake(self.frame.width-50, 20, 40, 40)
        closeTipsBtn.setImage(UIImage(named: "tips_close"), forState: UIControlState.Normal)
        closeTipsBtn.addTarget(self, action:#selector(closeBtnAction) , forControlEvents: UIControlEvents.TouchUpInside)
        self.addSubview(closeTipsBtn)
      }
      //关闭手势
      if hasCloseGesture {
        tipsImageView.userInteractionEnabled = true
        let tapGesture = UITapGestureRecognizer(target: self,action: #selector(tapGestureAction))
        tipsImageView.addGestureRecognizer(tapGesture)
      }
//    UIApplication.sharedApplication().windows.first?.makeKeyWindow()
    UIApplication.sharedApplication().keyWindow?.addSubview(self)
    }
  }
  /**
   添加透明按钮来响应事件
   - parameter btnFrame: 按钮的 frame
   - parameter target:    事件的执行者
   - parameter action:   事件
   */
  func addEmptyBtnToAction(btnFrame:CGRect,target:AnyObject,action:Selector) {
    let emptyBtn = UIButton(type:.Custom)
    emptyBtn.frame = btnFrame
    emptyBtn.addTarget(target, action:action, forControlEvents: .TouchUpInside)
    self.addSubview(emptyBtn)
  }
  // MARK: - private method
  func closeBtnAction() {
    self.removeFromSuperview()
  }
  func tapGestureAction() {
    self.closeBtnAction()
  }
}

当你实现上面这个类之后,即可简单方便的调用

  override func viewDidLoad() {
    super.viewDidLoad()
    //添加 tips
    let tips = TipsView.init(frame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT))
    tips.showTips("tips", hasCloseBtn: true, hasCloseGesture: true, key: "FirstTips")
  }

期待你的评论建议O(∩_∩)O~