ios ScrollView 问题

Question

我有一个 ScrollView ，它成功填充了 View ，但它没有滚动，任何人都可以看出为什么吗？

   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;

Answer 1

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 ScrollView ，则需要将 contentSize 宽度设置为 ImageView 数量的倍数:

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