我正在尝试制作一个简单的“个人资料” View ，允许用户更改他的照片。图像选择器成功加载图库，我选择新图像然后将其写入文档目录以在下次启动时加载它，问题是在我退出应用程序并再次重新启动之前 ImageView 不会刷新新图像(仅 viewDidLoad 有效但是 viewWillAppear 正在加载旧图像，尽管它被覆盖了!)有什么想法吗？
import UIKit
class Profile: UIViewController,UIImagePickerControllerDelegate,UINavigationControllerDelegate {
var imagePicker:UIImagePickerController=UIImagePickerController()
var pickedImage:UIImage?
let filemgr = NSFileManager.defaultManager()
@IBOutlet weak var profilepic: UIImageView!
@IBOutlet weak var lblheight: UILabel!
@IBOutlet weak var lblwidth: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
profilepic.layer.borderWidth=1
profilepic.layer.borderColor=UIColor.blackColor().CGColor
let tapGestureRecognizer = UITapGestureRecognizer(target:self, action:Selector("imageTapped:"))
profilepic.userInteractionEnabled = true
profilepic.addGestureRecognizer(tapGestureRecognizer)
imagePicker.delegate=self
if profileImageExists()
{
pickedImage=UIImage(named: Operations.getDocumentsDirectory().stringByAppendingPathComponent("profile.png"))!
} else {
pickedImage=UIImage(named:"camera.png")!
}
profilepic.image=pickedImage
}
func imageTapped(img: AnyObject)
{
imagePicker.allowsEditing = false
imagePicker.sourceType = .PhotoLibrary
presentViewController(imagePicker, animated: true, completion:
{
self.lblheight.text="completed"
print ("completed image tab")
}
)
}
override func viewWillAppear(animated: Bool) {
pickedImage=UIImage(named: Operations.getDocumentsDirectory().stringByAppendingPathComponent("profile.png"))!
profilepic.image=pickedImage
}
// MARK: - UIImagePickerControllerDelegate Methods
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
profilepic.contentMode = .ScaleToFill
profilepic.image = pickedImage
if let data = UIImagePNGRepresentation(pickedImage) {
let filename = Operations.getDocumentsDirectory().stringByAppendingPathComponent("profile.png")
data.writeToFile(filename, atomically: true)
}
}
dismissViewControllerAnimated(true, completion: nil)
}
func profileImageExists() -> Bool
{
if let profileImage=UIImage(named: Operations.getDocumentsDirectory().stringByAppendingPathComponent("profile.png"))
{
return true
}
else
{
return false
}
}
}
最佳答案
使用 init(named:) 加载 UIImage 会缓存图像。因此，只要图像名称未更改或系统正在清空缓存(例如，当您重新启动应用程序时)，图像就会从缓存中使用，而不会再次加载。
尝试使用 init(contentsOfFile:) 来加载图像。
关于ios - UIImageView 不更新图像，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34512918/