我们如何知道iPhone中的表格视图中的滚动到顶部（按下顶部）(How we know the Scroll to top ( push to top) in table view in iPhone

我们如何知道iPhone中的表格视图中的滚动到顶部（按下顶部）(How we know the Scroll to top ( push to top) in table view in iPhone)

我的iPhone应用程序中有一个表格视图

因为我想实施两个动作

当用户将表格滚动到顶部时。

当用户拉下表格视图时。

对于Ex：

If(UserScrollThe tableViewToTop) { perform action: 1 } If(UserScrollThe tableViewToDown) { perform action: 2 }

我们怎么知道使用将表移到顶部 /底部..？

I have a table view in my iPhone app

in that i want to implement two actions

when user scrolls the table to top.

When the user pulls down the table view.

For Ex:

If(UserScrollThe tableViewToTop) { perform action: 1 } If(UserScrollThe tableViewToDown) { perform action: 2 }

How can we know that the use move the table to Top / bottom..?

最满意答案

使用scrollView's delegate方法检查。

1）设置yourtableView.scrollView.delegate = self;

2）在.h文件中添加UIScrollViewDelegate

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在.h中添加CGPoint previousContentOffset

(void)scrollViewDidScroll:(UIScrollView *)scrollView { if (scrollView.contentOffset.y > previousContentOffset.y) { //scrolled downward //perform action for scrolled downward } else { //scrolled upward //perform action for scrolled upward } previousContentOffset = scrollView.contentOffset }

Check using scrollView's delegate method.

1) Set yourtableView.scrollView.delegate = self;

2) Add UIScrollViewDelegate in .h file

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Add CGPoint previousContentOffset in .h

(void)scrollViewDidScroll:(UIScrollView *)scrollView { if (scrollView.contentOffset.y > previousContentOffset.y) { //scrolled downward //perform action for scrolled downward } else { //scrolled upward //perform action for scrolled upward } previousContentOffset = scrollView.contentOffset }