Fix the issue when using the `sd_cancelCurrentImageLoad` on non-stateful view (like UIImageView.image) (#3653)

SDWebImage/Core/UIView+WebCacheOperation.h

@@ -20,14 +20,16 @@
  *
  *  @param key key for identifying the operations
  *  @return the image load operation
+ *  @note If key is nil, means using the NSStringFromClass(self.class) instead, match the behavior of `operation key`
  */
 - (nullable id<SDWebImageOperation>)sd_imageLoadOperationForKey:(nullable NSString *)key;
 
 /**
  *  Set the image load operation (storage in a UIView based weak map table)
  *
- *  @param operation the operation
+ *  @param operation the operation, should not be nil or no-op will perform
  *  @param key       key for storing the operation
+ *  @note If key is nil, means using the NSStringFromClass(self.class) instead, match the behavior of `operation key`
  */
 - (void)sd_setImageLoadOperation:(nullable id<SDWebImageOperation>)operation forKey:(nullable NSString *)key;
 
@@ -35,13 +37,15 @@
  *  Cancel the operation for the current UIView and key
  *
  *  @param key key for identifying the operations
+ *  @note If key is nil, means using the NSStringFromClass(self.class) instead, match the behavior of `operation key`
  */
 - (void)sd_cancelImageLoadOperationWithKey:(nullable NSString *)key;
 
 /**
  *  Just remove the operation corresponding to the current UIView and key without cancelling them
  *
- *  @param key key for identifying the operations
+ *  @param key key for identifying the operations.
+ *  @note If key is nil, means using the NSStringFromClass(self.class) instead, match the behavior of `operation key`
  */
 - (void)sd_removeImageLoadOperationWithKey:(nullable NSString *)key;
 

SDWebImage/Core/UIView+WebCacheOperation.m

@@ -29,28 +29,32 @@ typedef NSMapTable<NSString *, id<SDWebImageOperation>> SDOperationsDictionary;
 
 - (nullable id<SDWebImageOperation>)sd_imageLoadOperationForKey:(nullable NSString *)key  {
     id<SDWebImageOperation> operation;
-    if (key) {
+    if (!key) {
+        key = NSStringFromClass(self.class);
+    }
     SDOperationsDictionary *operationDictionary = [self sd_operationDictionary];
     @synchronized (self) {
         operation = [operationDictionary objectForKey:key];
     }
-    }
     return operation;
 }
 
 - (void)sd_setImageLoadOperation:(nullable id<SDWebImageOperation>)operation forKey:(nullable NSString *)key {
-    if (key) {
+    if (!key) {
+        key = NSStringFromClass(self.class);
+    }
     if (operation) {
         SDOperationsDictionary *operationDictionary = [self sd_operationDictionary];
         @synchronized (self) {
             [operationDictionary setObject:operation forKey:key];
         }
     }
-    }
 }
 
 - (void)sd_cancelImageLoadOperationWithKey:(nullable NSString *)key {
-    if (key) {
+    if (!key) {
+        key = NSStringFromClass(self.class);
+    }
     // Cancel in progress downloader from queue
     SDOperationsDictionary *operationDictionary = [self sd_operationDictionary];
     id<SDWebImageOperation> operation;
@@ -66,16 +70,16 @@ typedef NSMapTable<NSString *, id<SDWebImageOperation>> SDOperationsDictionary;
             [operationDictionary removeObjectForKey:key];
         }
     }
-    }
 }
 
 - (void)sd_removeImageLoadOperationWithKey:(nullable NSString *)key {
-    if (key) {
+    if (!key) {
+        key = NSStringFromClass(self.class);
+    }
     SDOperationsDictionary *operationDictionary = [self sd_operationDictionary];
     @synchronized (self) {
         [operationDictionary removeObjectForKey:key];
     }
-    }
 }
 
 @end