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[英]How to load image from url in JSQMessagesviewController IOS
[英]Open image from JSQMessagesViewController
我正在使用JSQMesssagesViewController来构建消息传递应用程序。 我现在可以使用此图像发送图像,但想点击图像以全屏打开。 此功能类似于标准消息传递应用程序,允许您点击图像“气泡”,并捏放大和缩小。 有没有人有过使用JSQMessagesViewController做这个的经验? 感谢那些可以提供帮助的人!
SWIFT 3:我发现了另一种不使用任何其他pod /库的方法。
1)添加var selectedImage: UIImage?
在ChatViewController
。
2)覆盖方法didTapMessageBubbleAt
,例如:
override func collectionView(_ collectionView: JSQMessagesCollectionView!, didTapMessageBubbleAt indexPath: IndexPath!) {
if let test = self.getImage(indexPath: indexPath) {
selectedImage = test
self.performSegue(withIdentifier: "showMedia", sender: self)
}
}
3)添加此函数以在用户点击图像时获取图像并返回UIImage
(如果是已粘贴的文本消息,则返回nil):
func getImage(indexPath: IndexPath) -> UIImage? {
let message = self.messages[indexPath.row]
if message.isMediaMessage == true {
let mediaItem = message.media
if mediaItem is JSQPhotoMediaItem {
let photoItem = mediaItem as! JSQPhotoMediaItem
if let test: UIImage = photoItem.image {
let image = test
return image
}
}
}
return nil
}
4)添加segue:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showMedia" {
if let pageDeDestination = segue.destination as? ShowMediaViewController {
pageDeDestination.image = selectedImage!
} else {
print("type destination not ok")
}
} else {
print("segue inexistant")
}
}
5)在Interface Builder中,在chatVC
附近添加一个View控制器,并添加一个带有showMedia
的segue(类型Show
)作为segue标识符。 在新的viewcontroller
添加图像视图。
6)这是我的ShowMediaViewController
的代码:
class ShowMediaViewController: UIViewController {
var image: UIImage? = nil
var titreText: String!
@IBOutlet weak var imageView: UIImageView!
@IBOutlet weak var titre: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
//titre.text = titreText
if image != nil {
imageView.image = image
} else {
print("image not found")
}
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
不要忘记将“Aspect Fit”作为参数放在图像视图中(在界面构建器中)以正确显示图像。
JSQmessage没有处理,但您可以在此方法中使用zoomPopup类添加此功能:
- (void)collectionView:(JSQMessagesCollectionView *)collectionView didTapMessageBubbleAtIndexPath:(NSIndexPath *)indexPath
{
JSQMessage *message = [self.messageModelData.messages objectAtIndex:indexPath.row];
if (message.isMediaMessage) {
id<JSQMessageMediaData> mediaItem = message.media;
if ([mediaItem isKindOfClass:[JSQPhotoMediaItem class]]) {
NSLog(@"Tapped photo message bubble!");
JSQPhotoMediaItem *photoItem = (JSQPhotoMediaItem *)mediaItem;
[self popupImage:photoItem.image];
}
}
}
- (void) popupImage: (UIImage*)image
{
UIWindow *window = [[UIApplication sharedApplication] keyWindow];
UIView *topView = window.rootViewController.view;
imageView = [[UIImageView alloc] initWithImage:image];
zoomPopup *popup = [[zoomPopup alloc] initWithMainview:topView andStartRect:CGRectMake(topView.frame.size.width/2, topView.frame.size.height/2, 0, 0)];
[popup showPopup:imageView];
}
你可以在这里看到zoomPopup: https : //github.com/Tintenklecks/zoomPopup
Swift 3.0.1希望它可以帮助某人。我测试了这段代码
在JSQMessagesViewController
上点击Image
时,我使用以下代码在全屏幕上显示image
。
override func collectionView(_ collectionView: JSQMessagesCollectionView, didTapMessageBubbleAt indexPath: IndexPath) {
let message: JSQMessage? = messages[indexPath.row]
if message?.isMediaMessage != nil {
let mediaItem: JSQMessageMediaData? = message?.media
if (mediaItem is JSQPhotoMediaItem) {
print("Tapped photo message bubble!")
let photoItem = mediaItem as? JSQPhotoMediaItem
let newImageView = UIImageView(image: photoItem?.image)
newImageView.frame = UIScreen.main.bounds
newImageView.backgroundColor = .gray
newImageView.contentMode = .scaleAspectFit
newImageView.isUserInteractionEnabled = true
let tap = UITapGestureRecognizer(target: self, action: #selector(dismissFullscreenImage))
newImageView.addGestureRecognizer(tap)
self.view.addSubview(newImageView)
self.tabBarController?.tabBar.isHidden = true // tabBarController exists
self.navigationController?.isNavigationBarHidden = true // default navigationController
}
}
}
func dismissFullscreenImage(_ sender: UITapGestureRecognizer) {
self.tabBarController?.tabBar.isHidden = false
self.navigationController?.isNavigationBarHidden = false
sender.view?.removeFromSuperview() // This will remove image from full screen
}
如果与PhotoSlider一起使用( https://github.com/nakajijapan/PhotoSlider )
// var images = [UIImage]() // puts images of messages here
override func collectionView(_ collectionView: JSQMessagesCollectionView!, didTapMessageBubbleAt indexPath: IndexPath!) {
let index = indexPath.row
let message = messages[index]
if message.isMediaMessage {
if message.media.isKind(of: JSQPhotoMediaItem.self) {
let photoSlider = PhotoSlider.ViewController(images: images)
let i = images.index(of: (message.media as! JSQPhotoMediaItem).image)!
photoSlider.currentPage = i
photoSlider.modalPresentationStyle = .overCurrentContext
photoSlider.modalTransitionStyle = .crossDissolve
present(photoSlider, animated: true, completion: nil)
}
}
}
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