即使添加透明边框后，旋转图像也会出现锯齿状边框

Question

在我的应用程序中，我需要旋转图像。我旋转图像，但它们有锯齿状的边框。我用谷歌搜索，发现添加透明边框解决了问题，但边框仍然是锯齿状的。

我的代码是

-(void)CreateRotatedImage:(UIImage *)image Number:(int)Number    
            {    
                UIImage *ImageBackground=[UIImage imageNamed:@"white-highlight.png"];

CGSize ImageBackgroundSize = CGSizeMake(60, 50);
UIGraphicsBeginImageContext(ImageBackgroundSize);
CGRect ImageBackgroundRect = CGRectMake(0.0, 0.0, ImageBackgroundSize.width, ImageBackgroundSize.height);
[ImageBackground drawInRect:ImageBackgroundRect];
ImageBackground = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();



CGSize ImageSize = CGSizeMake(50, 40);
UIGraphicsBeginImageContext(ImageSize);
CGRect ImageRect = CGRectMake(0.0, 0.0, ImageSize.width, ImageSize.height);
[image drawInRect:ImageRect];
image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();





UIGraphicsBeginImageContext(CGSizeMake(60,50));
[ImageBackground drawAtPoint:CGPointMake(0,0)];
[image drawAtPoint:CGPointMake(5,5)];
// MyscrollView.backgroundColor = [UIColor clearColor];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();



UIImage *pin=[UIImage imageNamed:@"pin.png"];
UIGraphicsBeginImageContext(CGSizeMake(60,50));
[newImage drawAtPoint:CGPointMake(0,0)];
[pin drawAtPoint:CGPointMake(newImage.size.height/2,0)];
// MyscrollView.backgroundColor = [UIColor clearColor];
UIImage *IntermediateImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();



CGRect imageRrect = CGRectMake(0, 0, IntermediateImage.size.width, IntermediateImage.size.height);
UIGraphicsBeginImageContext( imageRrect.size ); 
[IntermediateImage drawInRect:CGRectMake(2,2,IntermediateImage.size.width-2,IntermediateImage.size.height-2)];    
   UIImage *i = UIGraphicsGetImageFromCurrentImageContext();  
    UIGraphicsEndImageContext();



CGSize iSize = CGSizeMake(110, 70);

UIGraphicsBeginImageContext(iSize);

CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetAllowsAntialiasing(context, YES);
 CGContextSetShouldAntialias(context, YES);
CGContextRotateCTM (context, radians(5));
[i drawAtPoint:CGPointMake(0, 0)];
UIImage *RotatedImage=UIGraphicsGetImageFromCurrentImageContext();

//RotatedImage=[RotatedImage resizedImage:iSize interpolationQuality:kCGInterpolationHigh];  


}