Change all UIImage init method to alloc instead of autorelease to immediately release it after usage

@@ -65,7 +65,7 @@
             CGFloat scale = 1;
             scale = [UIScreen mainScreen].scale;
 #endif
-            UIImage *image = [UIImage imageWithCGImage:imageRef scale:scale orientation:UIImageOrientationUp];
+            UIImage *image = [[UIImage alloc] initWithCGImage:imageRef scale:scale orientation:UIImageOrientationUp];
             CGImageRelease(imageRef);
             
             SDWebImageFrame *frame = [SDWebImageFrame frameWithImage:image duration:duration];

@@ -107,9 +107,7 @@ static const CGFloat kDestSeemOverlap = 2.0f;   // the numbers of pixels to over
     
     UIImageOrientation orientation = [[self class] sd_imageOrientationFromImageData:data];
     if (orientation != UIImageOrientationUp) {
-        image = [UIImage imageWithCGImage:image.CGImage
-                                    scale:image.scale
-                              orientation:orientation];
+        image = [[UIImage alloc] initWithCGImage:image.CGImage scale:image.scale orientation:orientation];
     }
     
     return image;
@@ -175,7 +173,7 @@ static const CGFloat kDestSeemOverlap = 2.0f;   // the numbers of pixels to over
         
         if (partialImageRef) {
 #if SD_UIKIT || SD_WATCH
-            image = [UIImage imageWithCGImage:partialImageRef scale:1 orientation:_orientation];
+            image = [[UIImage alloc] initWithCGImage:partialImageRef scale:1 orientation:_orientation];
 #elif SD_MAC
             image = [[UIImage alloc] initWithCGImage:partialImageRef size:NSZeroSize];
 #endif
@@ -260,10 +258,7 @@ static const CGFloat kDestSeemOverlap = 2.0f;   // the numbers of pixels to over
         // Draw the image into the context and retrieve the new bitmap image without alpha
         CGContextDrawImage(context, CGRectMake(0, 0, width, height), imageRef);
         CGImageRef imageRefWithoutAlpha = CGBitmapContextCreateImage(context);
-        UIImage *imageWithoutAlpha = [UIImage imageWithCGImage:imageRefWithoutAlpha
-                                                         scale:image.scale
-                                                   orientation:image.imageOrientation];
-        
+        UIImage *imageWithoutAlpha = [[UIImage alloc] initWithCGImage:imageRefWithoutAlpha scale:image.scale orientation:image.imageOrientation];
         CGContextRelease(context);
         CGImageRelease(imageRefWithoutAlpha);
         
@@ -378,7 +373,7 @@ static const CGFloat kDestSeemOverlap = 2.0f;   // the numbers of pixels to over
         if (destImageRef == NULL) {
             return image;
         }
-        UIImage *destImage = [UIImage imageWithCGImage:destImageRef scale:image.scale orientation:image.imageOrientation];
+        UIImage *destImage = [[UIImage alloc] initWithCGImage:destImageRef scale:image.scale orientation:image.imageOrientation];
         CGImageRelease(destImageRef);
         if (destImage == nil) {
             return image;

@@ -254,7 +254,7 @@
     CGImageRef newImageRef = CGBitmapContextCreateImage(canvas);
     
 #if SD_UIKIT || SD_WATCH
-    image = [UIImage imageWithCGImage:newImageRef];
+    image = [[UIImage alloc] initWithCGImage:newImageRef];
 #elif SD_MAC
     image = [[UIImage alloc] initWithCGImage:newImageRef size:NSZeroSize];
 #endif