经常会遇到嵌套多个TableView的需求。以下是我最初的想法，但是不灵活，有局限。
存在的问题，如果底部分类数据为空时，不显示底部的视图，滑动逻辑则需变动。
布局分析：
ScrollView可同时执行多种手势
@implementation FLYBaseScrollView
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
return YES;
}
添加ScrollView 再添加TopView BottomView
[self.view addSubview:self.baseScrollView];
self.topView = [[FLYTopView alloc] init];
self.topView.frame = CGRectMake(0, 0, SCREEN_WIDTH, self.screen_height);
[self.topView renderUIWithInfo:@[] Model:@{}];
[self.baseScrollView addSubview:self.topView];
CGFloat contentSizeheight = self.topView.contentSizeHeight;
if (contentSizeheight > self.screen_height) {
self.baseScrollView.contentSize = CGSizeMake(SCREEN_WIDTH, self.screen_height*2);
FLYBottomView *view = [[FLYBottomView alloc] initWithFrame:CGRectMake(0, self.screen_height, SCREEN_WIDTH, self.screen_height) ConfigArray:self.dataSource];
[self.baseScrollView addSubview:view];
} else {
self.baseScrollView.contentSize = CGSizeMake(SCREEN_WIDTH, contentSizeheight + self.screen_height);
FLYBottomView *view = [[FLYBottomView alloc] initWithFrame:CGRectMake(0, contentSizeheight, SCREEN_WIDTH, self.screen_height) ConfigArray:self.dataSource];
[self.baseScrollView addSubview:view];
}
FLYBaseScrollView scrollViewDidScroll
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
CGFloat tabOffsetY;
CGFloat offsetY = scrollView.contentOffset.y;
_isTopIsCanNotMoveTabViewPre = _isTopIsCanNotMoveTabView;
_isCanMoveTopTabViewPre = _isCanMoveTopTabView;
if (self.topView.contentSizeHeight > self.screen_height) {
tabOffsetY = self.screen_height;
} else {
tabOffsetY = self.topView.contentSizeHeight;
_isCanMoveTopTabView = NO;
}
if (offsetY >= tabOffsetY) {
scrollView.contentOffset = CGPointMake(0, tabOffsetY);
_isTopIsCanNotMoveTabView = YES;
_isCanMoveTopTabView = NO;
} else {
_isTopIsCanNotMoveTabView = NO;
int temp = self.topView.contentSizeHeight-self.screen_height;
if (temp > 0) {
if (self.topView.contentOffsetY >= temp) {
if (offsetY <= 0) {
scrollView.contentOffset = CGPointMake(0, 0);
_isCanMoveTopTabView = YES;
} else {
_isCanMoveTopTabView = NO;
}
} else if (self.topView.contentOffsetY == 0) {
if (offsetY > 0) {
_isCanMoveTopTabView = YES;
} else {
_isCanMoveTopTabView = NO;
}
}
else {
scrollView.contentOffset = CGPointMake(0, 0);
_isCanMoveTopTabView = YES;
}
}
}
if (_isCanMoveTopTabView != _isCanMoveTopTabViewPre) {
if (!_isCanMoveTopTabViewPre && _isCanMoveTopTabView) {
[[NSNotificationCenter defaultCenter] postNotificationName:@"leaveHeaderBottom" object:nil userInfo:@{@"canScroll":@"1"}];
_canScroll = NO;
}
if(_isCanMoveTopTabViewPre && !_isCanMoveTopTabView) {
if (!_canScroll) {
}
}
}
if (_isTopIsCanNotMoveTabView != _isTopIsCanNotMoveTabViewPre) {
if (!_isTopIsCanNotMoveTabViewPre && _isTopIsCanNotMoveTabView) {
//NSLog(@"滑动到顶端");
[[NSNotificationCenter defaultCenter] postNotificationName:@"goTop" object:nil userInfo:@{@"canScroll":@"1"}];
_canScroll = NO;
}
if(_isTopIsCanNotMoveTabViewPre && !_isTopIsCanNotMoveTabView){
//NSLog(@"离开顶端");
if (!_canScroll) {
scrollView.contentOffset = CGPointMake(0, tabOffsetY);
}
}
}
}
FLYTopView scrollViewDidScroll
- (void)acceptMsg:(NSNotification *)notification {
NSString *notificationName = notification.name;
if ([notificationName isEqualToString:@"goBottom"]) {
int temp = self.contentSizeHeight-self.bounds.size.height;
self.mTableView.contentOffset = CGPointMake(0, temp);
self.canScroll = NO;
}
else if([notificationName isEqualToString:@"leaveHeaderBottom"]){
NSDictionary *userInfo = notification.userInfo;
NSString *canScroll = userInfo[@"canScroll"];
if ([canScroll isEqualToString:@"1"]) {
self.canScroll = YES;
}
}
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
CGFloat offsetY = scrollView.contentOffset.y;
int temp = self.contentSizeHeight-self.bounds.size.height;
if (!self.canScroll) {
if (offsetY >= 0) {
[scrollView setContentOffset:CGPointMake(0, temp)];
}
}
if (offsetY >= temp) {
[[NSNotificationCenter defaultCenter] postNotificationName:@"goBottom" object:nil userInfo:@{@"canScroll":@"1"}];
}
}
FLYBottomView->FLYGroupsItemView scrollViewDidScroll
- (void)acceptMsg:(NSNotification *)notification {
NSString *notificationName = notification.name;
if ([notificationName isEqualToString:@"goTop"]) {
NSDictionary *userInfo = notification.userInfo;
NSString *canScroll = userInfo[@"canScroll"];
if ([canScroll isEqualToString:@"1"]) {
self.canScroll = YES;
}
}else if([notificationName isEqualToString:@"leaveTop"]){
self.mTableView.contentOffset = CGPointZero;
self.canScroll = NO;
}
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
if (!self.canScroll) {
[scrollView setContentOffset:CGPointZero];
}
CGFloat offsetY = scrollView.contentOffset.y;
if (offsetY<=0) {
[[NSNotificationCenter defaultCenter] postNotificationName:@"leaveTop" object:nil userInfo:@{@"canScroll":@"1"}];
}
}
Github下载地址：https://github.com/superman-fly/FLYNestTableView
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作者：feiyue0823
来源：CSDN
原文：https://blog.csdn.net/feiyue0823/article/details/88412580
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