Ios 在UITableView中更新UIImage
我创建了一个自定义UITableView单元格,其中包含一个UIImage和一些标签。我已将UIImage标记为100,并尝试按如下方式更新它:Ios 在UITableView中更新UIImage,ios,iphone,uitableview,swift,uiimage,Ios,Iphone,Uitableview,Swift,Uiimage,我创建了一个自定义UITableView单元格,其中包含一个UIImage和一些标签。我已将UIImage标记为100,并尝试按如下方式更新它: import UIKit class SecondViewController: UIViewController, UITableViewDelegate, UITableViewDataSource { @IBOutlet weak var tableView: UITableView! let Items = ["Altitude","D
import UIKit
class SecondViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
@IBOutlet weak var tableView: UITableView!
let Items = ["Altitude","Distance","Groundspeed"]
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.Items.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell:UITableViewCell = self.tableView.dequeueReusableCellWithIdentifier("cell") as UITableViewCell
cell.textLabel?.text = self.Items[indexPath.row]
var CellImageView: UIImageView? = cell.viewWithTag(100) as UIImageView?
CellImageView!.image = UIImage(named: "Airspeed")
return cell
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.tableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: "cell")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
我应该如何更新UIImage?当前我在运行应用程序时遇到EXC\u BAD\u指令错误。您需要检查CellImageView是否为零 只需像我在代码中所做的那样添加if语句。这发生在您身上,因为CellImageView为nil。如果您检查CellImageView为nil,则不会发生任何事情。因此,当您有可选项时,请在使用它之前始终检查它。我不知道您想对viewWithTag执行什么操作。您可以使用另一个视图来加载图像,方法是使用
override func Prepareforsgue(segue:UIStoryboardSegue,sender:AnyObject?
.ex
这就是我在项目中所做的
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using [segue destinationViewController].
var secondeScene = segue.destinationViewController as DisplayViewController
// Pass the selected object to the new view controller.
if let indexPath = self.tableView.indexPathForSelectedRow(){
let selectedPhoto = photos[indexPath.row]
secondeScene.currentPhoto = selectedPhoto
}
就用这个
import UIKit
类SecondViewController:UIViewController、UITableViewDelegate、UITableViewDataSource{
@IBOutlet weak var tableView: UITableView!
let image = UIImage(named: "Airspeed")
let Items = ["Altitude","Distance","Groundspeed"]
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.Items.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell:UITableViewCell = self.tableView.dequeueReusableCellWithIdentifier("cell") as UITableViewCell
cell.textLabel?.text = self.Items[indexPath.row]
var CellImageView: UIImageView? = cell.viewWithTag(100) as UIImageView?
//if CellImageView !== nil{
//CellImageView!.image = UIImage(named: "Airspeed")
//}
return cell
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.tableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: "cell")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using [segue destinationViewController].
var secondeScene = segue.destinationViewController as DisplayViewController
// Pass the selected object to the new view controller.
if let indexPath = self.tableView.indexPathForSelectedRow(){
let selectedPhoto = image
secondeScene.currentPhoto = selectedPhoto
}
}
此选项用于第一个视图,然后用于第二个视图
class DisplayViewController: UIViewController {
var currentPhoto:UIImage
@IBOutlet弱var curentImage:UIImageView
重写func viewDidLoad(){
super.viewDidLoad()
}
重写函数didReceiveMemoryWarning(){
超级。我收到了记忆警告()
这会将图像加载到另一个视图上。将该类与IB中的视图链接起来我只是不明白为什么我需要第二个类?为什么我不能使用在interface builder中生成的ID在第一个类中引用UIImageView?如果可以,我宁愿将所有内容都保存在一个类中。
class DisplayViewController: UIViewController {
var image = UIImage(named: currentPhoto!.filename)
curentImage.image = image
// Do any additional setup after loading the view.