ios tableview吸顶

由于项目需要实现一个上滑吸顶的效果，网上也看到有很多种方式实现，但是如果加上下拉刷新的功能会导致界面异常，还有第三方库实现方式库，太繁琐了，下面是我的实现方式，效果如下：

tablevie滑动吸顶

主要代码部分：

横线滚动代理方法updateTopViewFrame

//父视图滚动的回调，用于横向滚动判断
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
    NSLog(@"scrollViewDidScroll - %.2f, %.2f",scrollView.contentOffset.x, scrollView.contentOffset.y);
    
    CGFloat placeholderOffset = 0;
    UIScrollView *scroll;
    if (self.topView.selectedIndex == 0) {
        scroll = self.firstTableView;
    }else {
        scroll = self.secondTableView;
    }
    if (scroll.contentOffset.y > CGRectGetHeight(self.topView.frame) - self.topView.itemHeight) {
        placeholderOffset = CGRectGetHeight(self.topView.frame) - self.topView.itemHeight;
    }else {
        placeholderOffset = scroll.contentOffset.y;
    }
    
    //当主talbeview向上滑动的时候，要禁止主scrollerview滑动，
    if([scrollView isKindOfClass:CustomScrollView.class]){
        if(scrollView.contentOffset.y >= 0){ //向上滑动
            self.ctyscrollview.contentOffset = CGPointZero;
            self.ctyscrollview.scrollEnabled = NO;
            self.firstTableView.contentOffset = CGPointZero;
            self.secondTableView.contentOffset = CGPointZero;
        }
        return;
    }
    
    [self.secondTableView setContentOffset:CGPointMake(0, placeholderOffset) animated:NO];
    [self.firstTableView setContentOffset:CGPointMake(0, placeholderOffset) animated:NO];
}

纵向滑动代理方法updateTopViewFrame

//子视图滚动的回调，用于竖直方向上滚动判断
- (void)updateTopViewFrame:(UIScrollView *)scrollView{
    CGFloat placeHolderHeight = CGRectGetHeight(self.topView.frame) - self.topView.itemHeight;
    CGFloat offsetY = scrollView.contentOffset.y;
    
    //顶部topiview跟随滑动
    CGFloat y = 0.0;
    if (offsetY >= 0 && (offsetY <= placeHolderHeight)) {
        NSLog(@"1- offsetY：%.2f <= placeHolderHeight：%.2f", offsetY, placeHolderHeight);
        y = -offsetY;
    } else if (offsetY > placeHolderHeight) {
        NSLog(@"2- offsetY：%.2f > placeHolderHeight：%.2f", offsetY, placeHolderHeight);
        y = -placeHolderHeight;
    } else if (offsetY < 0) {
        NSLog(@"3- offsetY：%.2f < 0,  placeHolderHeight：%.2f", offsetY, placeHolderHeight);
        y = -offsetY;
    }
    
    self.topView.y = y;
    
    
    //当主scrollerview滑动的时候，tableview要禁止滑动，
    if(offsetY <= 0){
        self.ctyscrollview.scrollEnabled = YES;
        self.firstTableView.contentOffset = CGPointZero;
        self.secondTableView.contentOffset = CGPointZero;
        if(!CGPointEqualToPoint(self.ctyscrollview.frame.origin, CGPointZero)){
            self.ctyscrollview.contentOffset = CGPointZero;
        }
    }else{
        self.ctyscrollview.scrollEnabled = NO;
    }
}

CustomScrollView中需要加上以下联动代理方法

///允许同时接受手势
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

demo代码下载地址：

Jack/多tableview滑动吸顶