diff --git a/SDWebImage/SDImageAPNGCoder.m b/SDWebImage/SDImageAPNGCoder.m
index a7cea27b..8c58aa1b 100644
--- a/SDWebImage/SDImageAPNGCoder.m
+++ b/SDWebImage/SDImageAPNGCoder.m
@@ -203,7 +203,7 @@ const CFStringRef kCGImagePropertyAPNGUnclampedDelayTime = (__bridge CFStringRef
     if (options[SDImageCoderEncodeCompressionQuality]) {
         compressionQuality = [options[SDImageCoderEncodeCompressionQuality] doubleValue];
     }
-    [properties setValue:@(compressionQuality) forKey:(__bridge NSString *)kCGImageDestinationLossyCompressionQuality];
+    properties[(__bridge NSString *)kCGImageDestinationLossyCompressionQuality] = @(compressionQuality);
     
     BOOL encodeFirstFrame = [options[SDImageCoderEncodeFirstFrameOnly] boolValue];
     if (encodeFirstFrame || frames.count == 0) {
@@ -213,7 +213,7 @@ const CFStringRef kCGImagePropertyAPNGUnclampedDelayTime = (__bridge CFStringRef
         // for animated APNG images
         NSUInteger loopCount = image.sd_imageLoopCount;
         NSDictionary *pngProperties = @{(__bridge NSString *)kCGImagePropertyAPNGLoopCount : @(loopCount)};
-        [properties setValue:pngProperties forKey:(__bridge NSString *)kCGImagePropertyPNGDictionary];
+        properties[(__bridge NSString *)kCGImagePropertyPNGDictionary] = pngProperties;
         CGImageDestinationSetProperties(imageDestination, (__bridge CFDictionaryRef)properties);
         
         for (size_t i = 0; i < frames.count; i++) {
diff --git a/SDWebImage/SDImageGIFCoder.m b/SDWebImage/SDImageGIFCoder.m
index 41cd4e00..008a2b0b 100644
--- a/SDWebImage/SDImageGIFCoder.m
+++ b/SDWebImage/SDImageGIFCoder.m
@@ -288,7 +288,7 @@
     if (options[SDImageCoderEncodeCompressionQuality]) {
         compressionQuality = [options[SDImageCoderEncodeCompressionQuality] doubleValue];
     }
-    [properties setValue:@(compressionQuality) forKey:(__bridge NSString *)kCGImageDestinationLossyCompressionQuality];
+    properties[(__bridge NSString *)kCGImageDestinationLossyCompressionQuality] = @(compressionQuality);
     
     BOOL encodeFirstFrame = [options[SDImageCoderEncodeFirstFrameOnly] boolValue];
     if (encodeFirstFrame || frames.count == 0) {
@@ -298,7 +298,7 @@
         // for animated GIF images
         NSUInteger loopCount = image.sd_imageLoopCount;
         NSDictionary *gifProperties = @{(__bridge NSString *)kCGImagePropertyGIFLoopCount : @(loopCount)};
-        [properties setValue:gifProperties forKey:(__bridge NSString *)kCGImagePropertyGIFDictionary];
+        properties[(__bridge NSString *)kCGImagePropertyGIFDictionary] = gifProperties;
         CGImageDestinationSetProperties(imageDestination, (__bridge CFDictionaryRef)properties);
         
         for (size_t i = 0; i < frames.count; i++) {
diff --git a/SDWebImage/SDImageIOCoder.m b/SDWebImage/SDImageIOCoder.m
index 7a34ee8e..a103a265 100644
--- a/SDWebImage/SDImageIOCoder.m
+++ b/SDWebImage/SDImageIOCoder.m
@@ -221,12 +221,12 @@
 #else
     CGImagePropertyOrientation exifOrientation = kCGImagePropertyOrientationUp;
 #endif
-    [properties setValue:@(exifOrientation) forKey:(__bridge NSString *)kCGImagePropertyOrientation];
+    properties[(__bridge NSString *)kCGImagePropertyOrientation] = @(exifOrientation);
     double compressionQuality = 1;
     if (options[SDImageCoderEncodeCompressionQuality]) {
         compressionQuality = [options[SDImageCoderEncodeCompressionQuality] doubleValue];
     }
-    [properties setValue:@(compressionQuality) forKey:(__bridge NSString *)kCGImageDestinationLossyCompressionQuality];
+    properties[(__bridge NSString *)kCGImageDestinationLossyCompressionQuality] = @(compressionQuality);
     
     // Add your image to the destination.
     CGImageDestinationAddImage(imageDestination, image.CGImage, (__bridge CFDictionaryRef)properties);
diff --git a/SDWebImage/SDWebImageManager.m b/SDWebImage/SDWebImageManager.m
index 33f5f6c6..bddb4c85 100644
--- a/SDWebImage/SDWebImageManager.m
+++ b/SDWebImage/SDWebImageManager.m
@@ -233,7 +233,7 @@ static id<SDImageLoader> _defaultImageLoader;
             } else {
                 mutableContext = [NSMutableDictionary dictionary];
             }
-            [mutableContext setValue:cachedImage forKey:SDWebImageContextLoaderCachedImage];
+            mutableContext[SDWebImageContextLoaderCachedImage] = cachedImage;
             context = [mutableContext copy];
         }