如何快速将图像添加到我的表格单元格? [英] How can I add an image to my table cell in swift?

问题描述

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fatal error: unwrapped an Optional value 时意外发现 nil

我的计划是传递一个 url 而不是硬编码的照片(因此使用 user["photo"] 而不是链接)，但为了测试，我将 url 粘贴到我的自定义图形中.

如何将其添加到文本旁边?

解决方案

一些事情:

为什么前面的行有cell!"而注释掉的行是cell?".另外，这是表视图子类吗?您确定您的 imageView 插座已连接?

更重要的是，您应该在加载图像数据时进行错误检查.

即:

if let data = NSData(contentsOfURL: url!){cell!.imageView?.image = UIImage(data: data)}

I'm following this tutorial and I'm creating cells for each json entry. Everything works fine without photos:

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    var cell = tableView.dequeueReusableCellWithIdentifier("CELL")

    if cell == nil {
        cell = UITableViewCell(style: UITableViewCellStyle.Value1, reuseIdentifier: "CELL")
    }

    let user:JSON =  JSON(self.items[indexPath.row])
   // print(user)
    let picURL = "/Users/K/Desktop/aproject/apps/address/addr/Images.xcassets/TabMap.imageset/up_dark.png"//just for tests - some random png
    let url = NSURL(string: picURL)
    let data = NSData(contentsOfURL: url!)

    cell!.textLabel?.text = user["description"].string
 //   cell?.imageView?.image = UIImage(data: data!)

    return cell!
}

, but when I add photos (uncomment this line):

cell?.imageView?.image = UIImage(data: data!)

then I'm getting error:

fatal error: unexpectedly found nil while unwrapping an Optional value

My plan is to pass there an url instead of hardcoded photo (so using user["photo"] instead of the link), but for tests I pasted the url to my custom graphic.

How can I add it next to text?

解决方案

A couple things:

Why does the line before have "cell!" and the commented out line is "cell?". Also, is this a table view subclass? Are you sure your imageView outlet is connected?

More importantly, you should do an error check when loading your image data.

That is:

if let data = NSData(contentsOfURL: url!)
{
    cell!.imageView?.image = UIImage(data: data)
}

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