問題描述

我有一個 scrollview，其中有 5 個寬度為 88 的圖像視圖.

I have a scrollview with 5 image views of width 88.

我希望 scrollview 滾動到每個圖像視圖 (非分頁)

I want the scrollview to scroll to each image view (Not Paging)

和

我想在 iPhone 中制作一個無限滾動視圖，這意味著當它滾動到最后一個項目時，它會在它旁邊顯示第一個項目..

I want to make an infinite scrollview in iPhone which means the when it scroll to last item it will display a first item next to it..

我一直在嘗試按偏移量，但是當按偏移量移動它時它會停止，而且 我使用了蘋果街道滾動條，它不允許我將每個元素停止在中心(就像選擇器視圖)..>

I have been trying by offset but it stops when move it by offset and also I have used apple street scroller which does not allow me to stop each element in center(just like Picker view)..

推薦答案

首先，我推薦使用 UITableView，這樣可以保持較低的內存使用率.我在一個項目中成功使用的方法如下:

First of all, I recommend to use a UITableView so you can maintain the memory usage low. An approach that I had used successfully in a project is the following:

1.列表項

復制單元格的內容，我的意思是如果你有 5 個這樣的項目:

Duplicate the content of your cells, I mean if you have 5 items in this way:

|1 |2 |3 |4 |5 |

| 1 | 2 | 3 | 4 | 5 |

您應該在表格末尾添加相同的內容(在具有可重用引擎的表格視圖中，這不是什么大問題)，以便看起來像這樣:

You should add the same (In a table view with reusable engine that's not a big deal) at the end of the table in order to look like this:

|1 |2 |3 |4 |5 |1 |2 |3 |4 |5 |

| 1 | 2 | 3 | 4 | 5 | 1 | 2 | 3 | 4 | 5 |

2.修改 scrollViewDidScroll 如下:

2. modify the scrollViewDidScroll with the following:

-(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    if (scrollView == _yourScrollView) {
        CGFloat currentOffsetX = scrollView.contentOffset.x;
        CGFloat currentOffSetY = scrollView.contentOffset.y;
        CGFloat contentHeight = scrollView.contentSize.height;

        if (currentOffSetY < (contentHeight / 6.0f)) {
            scrollView.contentOffset = CGPointMake(currentOffsetX,(currentOffSetY + (contentHeight/2)));
        }
        if (currentOffSetY > ((contentHeight * 4)/ 6.0f)) {
            scrollView.contentOffset = CGPointMake(currentOffsetX,(currentOffSetY - (contentHeight/2)));
        }
    }
}

如果您幾乎到達滾動的最后，上面的代碼將滾動位置移動到頂部；或者，如果您幾乎在頂部，則將您移至底部...

The code above move the scroll position at top if you almost reach the final of the scrolling; Or if you are almost on the top, moves you to the bottom...

3.就是這樣.

這篇關于如何在 iPhone 中制作無限滾動視圖?的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！