ios滚动视图难题 [英] ios scrollview cunundrum

问题描述

我有一个滚动视图，它成功地填充了视图，但它没有滚动，有人能明白为什么吗?

I have a scroll view which is populating with views successfully however it isnt scrolling, can anyone see why?

   CGRect fullScreenRect=[[UIScreen mainScreen] applicationFrame];

    UIScrollView *scrollView=[[UIScrollView alloc] initWithFrame:fullScreenRect];

    [scrollView setContentSize:self.view.frame.size];

    if (sqlite3_open(dbpath, &xxx) == SQLITE_OK)
    {
// code that works        
        if (sqlite3_prepare_v2(xxx, query_stmt, -1, &statement, NULL) == SQLITE_OK)
        {
            while (sqlite3_step(statement) == SQLITE_ROW)
            {
//more code that works                
                //add image view to view
                [scrollView addSubview:myImageView];

                i = i + 1;
            } 
            sqlite3_finalize(statement);
        }
        sqlite3_close(xxx);
    }

    self.view=scrollView;

推荐答案

为了使 scrollview 可滚动，您需要将其 contentSize 属性设置为能够包含所有内容(因此很可能大于 scrollview 框架).例如，如果您想水平滚动视图，则需要将 contentSize 宽度设置为图像视图数的倍数:

In order to make scrollview scrollable you need to set its contentSize property to be able to contain all your contents (and so most likely larger than scrollview frame). For example in case you want to scroll your views horizontally you'll need to set contentSize width to a multiple of the number of your image views:

...
// Loaded data and created subviews
// Now set contentSize
[scrollView setContentSize:CGSizeMake(imageWidth*numberOfImages, self.view.frame.size.height)];

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