feat: getImage iOS (#253)

* feat: getImage iOS

* Support more image types including GIF

* use itemProviders

* use identifier that comforms to UTTypeImage

Author: s77rt

README.md

@@ -215,7 +215,6 @@ _setContent() {
 | ------- | -------- | -------- | ----------------------------------------- |
 | content | string[] | Yes      | The content to be stored in the clipboard |
 
-
 #### `hasString()`
 
 ```jsx
@@ -255,8 +254,6 @@ static hasWebURL()
 Returns whether the clipboard has a WebURL(UIPasteboardDetectionPatternProbableWebURL) content.
 Can check if there is a WebURL content in clipboard without triggering PasteBoard notification for iOS 14+
 
-
-
 ### useClipboard
 
 `useClipboard` is a utility hooks for the `Clipboard` module. `data` contains the content stored in the clipboard.
@@ -283,7 +280,7 @@ export const HooksSample = () => {
 static getImage()
 ```
 
-Get content of image in base64 string type, this method returns a `Promise`, so you can use following code to get clipboard content (ANDROID only)
+Get content of image in base64 string type, this method returns a `Promise`, so you can use following code to get clipboard content (iOS and Android Only)
 
 ```jsx
 async _getContent() {

ios/RNCClipboard.mm

@@ -1,6 +1,7 @@
 #import "RNCClipboard.h"
 
-
+#import <MobileCoreServices/MobileCoreServices.h>
+#import <MobileCoreServices/UTType.h>
 #import <UIKit/UIKit.h>
 #import <React/RCTBridge.h>
 #import <React/RCTEventDispatcher.h>
@@ -215,7 +216,22 @@ - (void) listener:(NSNotification *) notification
 
 RCT_EXPORT_METHOD(getImage:(RCTPromiseResolveBlock)resolve
                   reject:(__unused RCTPromiseRejectBlock)reject){
-  reject(@"Clipboard:getImage", @"getImage is not supported on iOS", nil);
+  UIPasteboard *clipboard = [UIPasteboard generalPasteboard];
+  NSString *withPrefix;
+  for (NSItemProvider *itemProvider in clipboard.itemProviders) {
+    if ([itemProvider hasItemConformingToTypeIdentifier:(NSString *)kUTTypeImage]) {
+      for (NSString *identifier in itemProvider.registeredTypeIdentifiers) {
+        if (UTTypeConformsTo((__bridge CFStringRef)identifier, kUTTypeImage)) {
+          NSString *MIMEType = (__bridge_transfer NSString *)UTTypeCopyPreferredTagWithClass((__bridge CFStringRef)identifier, kUTTagClassMIMEType);
+          NSString *imageDataBase64 = [[clipboard dataForPasteboardType:identifier] base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
+          withPrefix = [NSString stringWithFormat:@"data:%@;base64,%@", MIMEType, imageDataBase64];
+          break;
+        }
+      }
+      break;
+    }
+  }
+  resolve((withPrefix ? : NULL));
 }
 
 RCT_EXPORT_METHOD(addListener : (NSString *)eventName) {

src/Clipboard.ts

@@ -71,7 +71,7 @@ export const Clipboard = {
     NativeClipboard.setImage(content);
   },
   /**
-   * (Android Only)
+   * (iOS and Android Only)
    * Get clipboard image in base64, this method returns a `Promise`, so you can use following code to get clipboard content
    * ```javascript
    * async _getContent() {

src/NativeClipboardModule.ts

@@ -59,7 +59,7 @@ export interface Spec extends TurboModule {
    */
   setImage(content: string): Promise<void>;
   /**
-   * (Android Only)
+   * (iOS and Android Only)
    * Get clipboard image in base64, this method returns a `Promise`, so you can use following code to get clipboard content
    * ```javascript
    * async _getContent() {