Support to cache the LPLinkMetadata's title into the disk cache, make it possible for UI display

Author: dreampiggy

Example/Podfile

@@ -3,6 +3,7 @@ use_frameworks!
 target 'SDWebImageLinkPlugin_Example' do
   platform :ios, '13.0'
   pod 'SDWebImageLinkPlugin', :path => '../'
+  pod 'SDWebImage', :path => '/Users/lizhuoli/Documents/GitHub/sdwebImage'
 
   target 'SDWebImageLinkPlugin_Tests' do
     inherit! :search_paths
@@ -13,4 +14,5 @@ end
 target 'SDWebImageLinkPlugin_Example macOS' do
   platform :osx, '10.15'
   pod 'SDWebImageLinkPlugin', :path => '../'
+  pod 'SDWebImage', :path => '/Users/lizhuoli/Documents/GitHub/sdwebImage'
 end

Example/Podfile.lock

@@ -1,29 +1,31 @@
 PODS:
   - Expecta (1.0.6)
-  - SDWebImage (5.3.1):
-    - SDWebImage/Core (= 5.3.1)
-  - SDWebImage/Core (5.3.1)
+  - SDWebImage (5.3.2):
+    - SDWebImage/Core (= 5.3.2)
+  - SDWebImage/Core (5.3.2)
   - SDWebImageLinkPlugin (0.1.0):
     - SDWebImage (~> 5.0)
 
 DEPENDENCIES:
   - Expecta
+  - SDWebImage (from `/Users/lizhuoli/Documents/GitHub/sdwebImage`)
   - SDWebImageLinkPlugin (from `../`)
 
 SPEC REPOS:
   trunk:
     - Expecta
-    - SDWebImage
 
 EXTERNAL SOURCES:
+  SDWebImage:
+    :path: "/Users/lizhuoli/Documents/GitHub/sdwebImage"
   SDWebImageLinkPlugin:
     :path: "../"
 
 SPEC CHECKSUMS:
   Expecta: 3b6bd90a64b9a1dcb0b70aa0e10a7f8f631667d5
-  SDWebImage: 7137d57385fb632129838c1e6ab9528a22c666cc
+  SDWebImage: 6ac2eb96571bff96ecde31a987172c5934a0eb7d
   SDWebImageLinkPlugin: f77eb1f3ef322a2cb331ecf62cf78444529de597
 
-PODFILE CHECKSUM: 74e009387008b3c98728da0575236586673f1fec
+PODFILE CHECKSUM: b080bcae01315fea0c82763be9711485ae91d032
 
 COCOAPODS: 1.8.4

Example/SDWebImageLinkPlugin/SDViewController.m

@@ -87,7 +87,7 @@ - (void)viewDidLoad {
                                                                             style:UIBarButtonItemStylePlain
                                                                            target:self
                                                                            action:@selector(switchView)];
-    self.useLinkView = NO;
+    self.useLinkView = YES;
     self.objects = [NSArray arrayWithObjects:
                     @"https://www.apple.com/",
                     @"https://www.apple.com/music/",

SDWebImageLinkPlugin/Classes/LPLinkView+WebCache.m

@@ -69,6 +69,13 @@ - (void)sd_setImageWithURL:(nullable NSURL *)url
             metadata = [[LPLinkMetadata alloc] init];
             metadata.originalURL = url;
             metadata.URL = imageURL;
+            NSData *extendedData = image.sd_extendedData;
+            if (extendedData) {
+                NSString *title = [[NSString alloc] initWithData:extendedData encoding:NSUTF8StringEncoding];
+                if (title.length > 0) {
+                    metadata.title = title;
+                }
+            }
             // LPLinkMetadata.imageProvider on iOS 13.1 contains bug which cause async query, and not compatible for cell-reusing. Radar FB7462933
             id<LPImageProtocol> linkImage = [[NSClassFromString(LPImageClass) alloc] initWithPlatformImage:image];
             [metadata setValue:linkImage forKey:@"image"];

SDWebImageLinkPlugin/Classes/SDImageLinkLoader.m

@@ -154,6 +154,9 @@ - (void)fetchImageDataWithProvider:(NSItemProvider *)imageProvider operation:(SD
         UIImage *image = SDImageLoaderDecodeImageData(data, url, options, context);
         if (!image) {
             error = [NSError errorWithDomain:SDWebImageErrorDomain code:SDWebImageErrorBadImageData userInfo:nil];
+        } else {
+            LPLinkMetadata *metadata = url.sd_linkMetadata;
+            image.sd_extendedData = [metadata.title dataUsingEncoding:NSUTF8StringEncoding];
         }
         if (completedBlock) {
             dispatch_main_async_safe(^{
@@ -192,6 +195,9 @@ - (void)fetchImageWithProvider:(NSItemProvider *)imageProvider operation:(SDImag
         NSAssert([image isKindOfClass:UIImage.class], @"NSItemProvider loaded object should be UIImage class");
         if (!image) {
             error = [NSError errorWithDomain:SDWebImageErrorDomain code:SDWebImageErrorBadImageData userInfo:nil];
+        } else {
+            LPLinkMetadata *metadata = url.sd_linkMetadata;
+            image.sd_extendedData = [metadata.title dataUsingEncoding:NSUTF8StringEncoding];
         }
         if (completedBlock) {
             dispatch_main_async_safe(^{