diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6b3dba40..0de3d1be 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -60,6 +60,7 @@
   - Another `SDImageCache` clarification: `imageFromDiskCacheForKey:` used to also check the memory cache which I think is misleading. Now `imageFromDiskCacheForKey` only checks the disk cache and the new method `imageFromCacheForKey` checks both caches
   - Got rid of `removeImageForKey:` and `removeImageForKey:fromDisk:` from `SDImageCache` that looked sync but were async. Left only the 2 async ones
   - Removed `UIImageView` `sd_cancelCurrentHighlightedImageLoad`
+- Added `sd_` prefix to the activity indicator related methods (`setShowActivityIndicatorView:`, `setIndicatorStyle:`, `showActivityIndicatorView`, `addActivityIndicator`, `removeActivityIndicator`) #1640
 
 #### Features:
 
diff --git a/Examples/SDWebImage Demo/MasterViewController.m b/Examples/SDWebImage Demo/MasterViewController.m
index 33cc82ba..70fcc1e4 100644
--- a/Examples/SDWebImage Demo/MasterViewController.m	
+++ b/Examples/SDWebImage Demo/MasterViewController.m	
@@ -124,8 +124,8 @@
         cell = [[MyCustomTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
     }
 
-    [cell.customImageView setShowActivityIndicatorView:YES];
-    [cell.customImageView setIndicatorStyle:UIActivityIndicatorViewStyleGray];
+    [cell.customImageView sd_setShowActivityIndicatorView:YES];
+    [cell.customImageView sd_setIndicatorStyle:UIActivityIndicatorViewStyleGray];
     
     cell.customTextLabel.text = [NSString stringWithFormat:@"Image #%ld", (long)indexPath.row];
     [cell.customImageView sd_setImageWithURL:[NSURL URLWithString:_objects[indexPath.row]]
diff --git a/SDWebImage/UIView+WebCache.h b/SDWebImage/UIView+WebCache.h
index bab19f1e..d6a71068 100644
--- a/SDWebImage/UIView+WebCache.h
+++ b/SDWebImage/UIView+WebCache.h
@@ -61,18 +61,18 @@ typedef void(^SDSetImageBlock)(UIImage * _Nullable image, NSData * _Nullable ima
 /**
  *  Show activity UIActivityIndicatorView
  */
-- (void)setShowActivityIndicatorView:(BOOL)show;
+- (void)sd_setShowActivityIndicatorView:(BOOL)show;
 
 /**
  *  set desired UIActivityIndicatorViewStyle
  *
  *  @param style The style of the UIActivityIndicatorView
  */
-- (void)setIndicatorStyle:(UIActivityIndicatorViewStyle)style;
+- (void)sd_setIndicatorStyle:(UIActivityIndicatorViewStyle)style;
 
-- (BOOL)showActivityIndicatorView;
-- (void)addActivityIndicator;
-- (void)removeActivityIndicator;
+- (BOOL)sd_showActivityIndicatorView;
+- (void)sd_addActivityIndicator;
+- (void)sd_removeActivityIndicator;
 
 #endif
 
diff --git a/SDWebImage/UIView+WebCache.m b/SDWebImage/UIView+WebCache.m
index 32a76ed8..ad2b54c4 100644
--- a/SDWebImage/UIView+WebCache.m
+++ b/SDWebImage/UIView+WebCache.m
@@ -46,14 +46,14 @@ static char TAG_ACTIVITY_SHOW;
     
     if (url) {
         // check if activityView is enabled or not
-        if ([self showActivityIndicatorView]) {
-            [self addActivityIndicator];
+        if ([self sd_showActivityIndicatorView]) {
+            [self sd_addActivityIndicator];
         }
         
         __weak __typeof(self)wself = self;
         id <SDWebImageOperation> operation = [SDWebImageManager.sharedManager loadImageWithURL:url options:options progress:progressBlock completed:^(UIImage *image, NSData *data, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
             __strong __typeof (wself) sself = wself;
-            [sself removeActivityIndicator];
+            [sself sd_removeActivityIndicator];
             if (!sself) {
                 return;
             }
@@ -81,7 +81,7 @@ static char TAG_ACTIVITY_SHOW;
         [self sd_setImageLoadOperation:operation forKey:validOperationKey];
     } else {
         dispatch_main_async_safe(^{
-            [self removeActivityIndicator];
+            [self sd_removeActivityIndicator];
             if (completedBlock) {
                 NSError *error = [NSError errorWithDomain:SDWebImageErrorDomain code:-1 userInfo:@{NSLocalizedDescriptionKey : @"Trying to load a nil url"}];
                 completedBlock(nil, error, SDImageCacheTypeNone, url);
@@ -136,28 +136,28 @@ static char TAG_ACTIVITY_SHOW;
 }
 #endif
 
-- (void)setShowActivityIndicatorView:(BOOL)show {
+- (void)sd_setShowActivityIndicatorView:(BOOL)show {
     objc_setAssociatedObject(self, &TAG_ACTIVITY_SHOW, @(show), OBJC_ASSOCIATION_RETAIN);
 }
 
-- (BOOL)showActivityIndicatorView {
+- (BOOL)sd_showActivityIndicatorView {
     return [objc_getAssociatedObject(self, &TAG_ACTIVITY_SHOW) boolValue];
 }
 
 #if SD_UIKIT
-- (void)setIndicatorStyle:(UIActivityIndicatorViewStyle)style{
+- (void)sd_setIndicatorStyle:(UIActivityIndicatorViewStyle)style{
     objc_setAssociatedObject(self, &TAG_ACTIVITY_STYLE, [NSNumber numberWithInt:style], OBJC_ASSOCIATION_RETAIN);
 }
 
-- (int)getIndicatorStyle{
+- (int)sd_getIndicatorStyle{
     return [objc_getAssociatedObject(self, &TAG_ACTIVITY_STYLE) intValue];
 }
 #endif
 
-- (void)addActivityIndicator {
+- (void)sd_addActivityIndicator {
 #if SD_UIKIT
     if (!self.activityIndicator) {
-        self.activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:[self getIndicatorStyle]];
+        self.activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:[self sd_getIndicatorStyle]];
         self.activityIndicator.translatesAutoresizingMaskIntoConstraints = NO;
         
         dispatch_main_async_safe(^{
@@ -186,7 +186,7 @@ static char TAG_ACTIVITY_SHOW;
 #endif
 }
 
-- (void)removeActivityIndicator {
+- (void)sd_removeActivityIndicator {
 #if SD_UIKIT
     if (self.activityIndicator) {
         [self.activityIndicator removeFromSuperview];