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