今天博主有一个类似淘宝商品详情查看翻页效果的实现的需求,遇到了一些困难点,在此和大家分享,希望能够共同进步.
1.使用第三方框架
我用到的第三方库EGORefreshTableHeaderView下拉刷新的效果还有就是PWLoadMoreTableFooterView上拉加载更多
主要的思路在于UISCrollView两页，一页展示商品概况，另一页展示商品更多详情
首先，第一页的view包含一个UITableView，这个tableView实现PWLoadMoreTableFooterView中的delegate方法，
实现delegate代理方法的时候使用
- (void)scrollViewByPageControlPage:(NSInteger)page
{
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.50];
[self.backScrollView setContentOffset:CGPointMake(0, (ScreenHeight-navigationHeight-OffsetHeight)*page)];
[UIView commitAnimations];
}
将scrollView滚动到第二页，以便展示更多详情。
再次，在scrollview的第二页中加入一个View ，在此view上再创建一个ScrollView，这个scrollView实现EGORefreshTableHeaderView的delegate方法
具体如下：
#pragma mark EGORefreshTableHeaderDelegate Methods
- (void)egoRefreshTableHeaderDidTriggerRefresh:(EGORefreshTableHeaderView*)view{
[self reloadTableViewDataSource];
[self performSelector:@selector(doneLoadingTableViewDataForIndex) withObject:nil afterDelay:1.0];
}
- (void)doneLoadingTableViewDataForIndex
{
_reloading = NO;
[_refreshHeaderView egoRefreshScrollViewDataSourceDidFinishedLoading:lectureScrollView];
[_loadMoreFooterView pwLoadMoreTableDataSourceDidFinishedLoading];
[self scrollViewByPageControlPage:0];
}
- (BOOL)egoRefreshTableHeaderDataSourceIsLoading:(EGORefreshTableHeaderView*)view{
return _reloading; // should return if data source model is reloading
}
- (NSDate*)egoRefreshTableHeaderDataSourceLastUpdated:(EGORefreshTableHeaderView*)view{
return [NSDate date]; // should return date data source was last changed
}
一下实现EGORefreshTableHeaderView的delegate方法
此处设置跳转到SCRollView第一页
- (void)doneLoadingTableViewDataForIndex
{
_reloading = NO;
[_refreshHeaderView egoRefreshScrollViewDataSourceDidFinishedLoading:lectureScrollView];
[_loadMoreFooterView pwLoadMoreTableDataSourceDidFinishedLoading];
[self scrollViewByPageControlPage:0];
}
2.使用原生框架
代码贴出来,各位看官自行理解
- (void)viewDidLoad
{
[super viewDidLoad];
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(doPan:)];
[self.view addGestureRecognizer:pan];
pan.enabled = NO;
self.panGesture = pan;
_panGesture.delaysTouchesBegan = YES;
[self.view bringSubviewToFront:_tableView];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)scrollViewDidScroll:(UIScrollView *)aScrollView {
CGPoint offset = aScrollView.contentOffset;
CGRect bounds = aScrollView.bounds;
CGSize size = aScrollView.contentSize;
UIEdgeInsets inset = aScrollView.contentInset;
float y = offset.y + bounds.size.height - inset.bottom;
float h = size.height;
float reload_distance = 30;
if(y > h + reload_distance) {
NSLog(@"load more rows");
_panGesture.enabled = YES;//一个拖动手势
self.tableView.scrollEnabled = NO;
_isCurrentOnScreen = YES;
}
}
- (void)doPan:(UIPanGestureRecognizer *)pan
{
if(pan.state == UIGestureRecognizerStateBegan)
{
self.beginPoint = [pan locationInView:self.view];
// self.beginPoint=[pan locationInView:self.view];
}else if (pan.state == UIGestureRecognizerStateChanged)
{
if(_isCurrentOnScreen)
{
CGPoint touchPoint = [self.view convertPoint: [pan locationInView:self.tableView] fromView:_tableView] ;
[self.tableView setFrame:CGRectMake(0, 20 + touchPoint.y - _beginPoint.y, 320, 460)];
}else
{
[self.tableView setFrame:CGRectMake(0, - 480 + [pan locationInView:self.view].y - _beginPoint.y, 320, 460)];
}
}else if (pan.state == UIGestureRecognizerStateEnded)
{
if(_isCurrentOnScreen)
{
CGPoint touchPoint = [self.view convertPoint: [pan locationInView:self.tableView] fromView:_tableView] ;
if(touchPoint.y - _beginPoint.y < -200)
{
[UIView animateWithDuration:0.01 animations:^{
[self.tableView setFrame:CGRectMake(0, - 480, 320, 460)];
}];
_isCurrentOnScreen = NO;
}else
{
[UIView animateWithDuration:0.01 animations:^{
[self.tableView setFrame:CGRectMake(0, 20, 320, 460)];
} completion:^(BOOL finished) {
[self stopPan];
}];
}
}else
{
if([pan locationInView:self.view].y - _beginPoint.y < 200)
{
[UIView animateWithDuration:0.3 animations:^{
[self.tableView setFrame:CGRectMake(0, -480, 320, 460)];
}];
_isCurrentOnScreen = NO;
}else
{
[UIView animateWithDuration:0.3 animations:^{
[self.tableView setFrame:CGRectMake(0, 20, 320, 460)];
} completion:^(BOOL finished) {
[self stopPan];
}];
}
}
[self.view bringSubviewToFront:_tableView];
}
}
- (void)pan:(UIPanGestureRecognizer *)pan
{
NSLog(@"11");
}
- (void)stopPan
{
self.tableView.scrollEnabled = YES;
_panGesture.enabled = NO;
_tableView.panGestureRecognizer.enabled = YES;
}