封装了一个仿照抖音效果的iOS评论弹窗

需求背景

开发一个类似抖音评论弹窗交互效果的弹窗，支持滑动消失，

滑动查看评论

效果如下图

思路

创建一个视图，该视图上面放置一个tableView, 该视图上添加一个滑动手势，同时设置代理，实现代理方法

• (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {

  支持同时响应手势，就是为了我们tableView滚动到顶部的时候，继续滚动父亲视图，达到连续滑动的效果，如果不是设置同时响应的话，我们滚动到tableView顶部，继续向下滑动的话，整个弹窗是不会向下滑动的，同时，滚动到顶部的时候，要设置tableView.pangesture.enabled = NO,否则反复来回滑动的时候，会造成两个视图同时滚动的效果

  代码

  //
  //  LBCommentPopView.m
  //  TEXT
  //
  //  Created by mac on 2024/7/7.
  //  Copyright © 2024 刘博. All rights reserved.
  //
  #import "LBCommentPopView.h"
  #import "LBFunctionTestHeader.h"
  @interface LBCommentPopView () 
  @property (nonatomic, strong) UITapGestureRecognizer *tapGesture;
  @property (nonatomic, strong) UIPanGestureRecognizer *panGesture;
  @property (nonatomic, weak) UIScrollView *scrollView;
  @property (nonatomic, assign) BOOL isDragScrollView;
  @property (nonatomic, assign) CGFloat lastTransitionY;
  @end
  @implementation LBCommentPopView
  - (instancetype)initWithFrame:(CGRect)frame {
      if (self = [super initWithFrame:frame]) {
          [self createRecognizer];
      }
      return self;
  }
  - (void)createRecognizer {
      [self addGestureRecognizer:self.tapGesture];
      [self addGestureRecognizer:self.panGesture];
  }
  - (void)show:(void (^)(void))completion {
      self.hidden = NO;
      [UIView animateWithDuration:0.25f animations:^{
          CGRect frame = self.containerView.frame;
          frame.origin.y = self.frame.size.height - frame.size.height;
          self.containerView.frame = frame;
      } completion:^(BOOL finished) {
          !completion ? : completion();
      }];
  }
  - (void)dismiss {
      [UIView animateWithDuration:0.25f animations:^{
          CGRect frame = self.containerView.frame;
          frame.origin.y = ScreenHeight;
          self.containerView.frame = frame;
      }completion:^(BOOL finished) {
          self.hidden = YES;
      }];
  }
  #pragma mark - UIGestureRecognizerDelegate
  - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
      if (gestureRecognizer == self.panGesture) {
          UIView *touchView = touch.view;
          while (touchView != nil) {
              if ([touchView isKindOfClass:[UIScrollView class]]) {
                  self.scrollView = (UIScrollView *)touchView;
                  self.isDragScrollView = YES;
                  break;
              }else if (touchView == self.containerView) {
                  self.isDragScrollView = NO;
                  break;
              }
              touchView = (UIView *)[touchView nextResponder];
          }
      }
      return YES;
  }
  - (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
      if (gestureRecognizer == self.tapGesture) {
          CGPoint point = [gestureRecognizer locationInView:self.containerView];
          if ([self.containerView.layer containsPoint:point] && gestureRecognizer.view == self) {
              return NO;
          }
      }else if (gestureRecognizer == self.panGesture) {
          return YES;
      }
      return YES;
  }
  // 是否与其他手势共存
  - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
      if (gestureRecognizer == self.panGesture) {
          if ([otherGestureRecognizer isKindOfClass:NSClassFromString(@"UIScrollViewPanGestureRecognizer")] || [otherGestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]]) {
              if ([otherGestureRecognizer.view isKindOfClass:[UIScrollView class]]) {
                  return YES;
              }
          }
      }
      return NO;
  }
  #pragma mark - HandleGesture
  - (void)handleTapGesture:(UITapGestureRecognizer *)tapGesture {
      CGPoint point = [tapGesture locationInView:self.containerView];
      if (![self.containerView.layer containsPoint:point] && tapGesture.view == self) {
          [self dismiss];
      }
  }
  - (void)handlePanGesture:(UIPanGestureRecognizer *)panGesture {
      CGPoint translation = [panGesture translationInView:self.containerView];
      if (self.isDragScrollView) {
          // 当UIScrollView在最顶部时，处理视图的滑动
          if (self.scrollView.contentOffset.y  0) { // 向下拖拽
                  self.scrollView.contentOffset = CGPointZero;
                  self.scrollView.panGestureRecognizer.enabled = NO;
                  self.isDragScrollView = NO;
                  
                  CGRect contentFrame = self.containerView.frame;
                  contentFrame.origin.y += translation.y;
                  self.containerView.frame = contentFrame;
              }
          }
      }else {
          CGFloat contentM = (self.frame.size.height - self.containerView.frame.size.height);
          
          if (translation.y > 0) { // 向下拖拽
              CGRect contentFrame = self.containerView.frame;
              contentFrame.origin.y += translation.y;
              self.containerView.frame = contentFrame;
          }else if (translation.y  contentM) { // 向上拖拽
              CGRect contentFrame = self.containerView.frame;
              contentFrame.origin.y = MAX((self.containerView.frame.origin.y + translation.y), contentM);
              self.containerView.frame = contentFrame;
          }
      }
      
      [panGesture setTranslation:CGPointZero inView:self.containerView];
      
      if (panGesture.state == UIGestureRecognizerStateEnded) {
          CGPoint velocity = [panGesture velocityInView:self.containerView];
          
          self.scrollView.panGestureRecognizer.enabled = YES;
          
          // 结束时的速度>0 滑动距离> 5 且UIScrollView滑动到最顶部
          NSLog(@"%f", self.lastTransitionY);
          if (velocity.y > 0 && self.lastTransitionY > 5 && !self.isDragScrollView) {
              [self dismiss];
          }else {
              [self show:^{
                  
              }];
          }
      }
      
      self.lastTransitionY = translation.y;
  }
  #pragma mark - lazy load
  - (UITapGestureRecognizer *)tapGesture {
      if (!_tapGesture) {
          _tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapGesture:)];
          _tapGesture.delegate = self;
      }
      return _tapGesture;
  }
  - (UIPanGestureRecognizer *)panGesture {
      if (!_panGesture) {
          _panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePanGesture:)];
          _panGesture.delegate = self;
      }
      return _panGesture;
  }
  @end
  

  demo link