Strange problem with transparent image rendering on iOS

Question

I have UIImageView, which is used for showing image from resources. Image appears to be distorted. It is especially visible if you zoom the image in a graphics editor.
UIImageView size matches the size of the image.
currently used UIImageView parameters.
imgHeader.contentMode = UIViewContentModeCenter;
imgHeader.image = [UIImage imageNamed:@"logo.png"];
imgHeader.opaque = TRUE;
imgHeader.clearsContextBeforeDrawing = TRUE;
For UIImageView I tried changing parameters "opaque", "clearsContextBeforeDrawing" and "contentMode". Same result.
For resolving this issue I have also wrote classes AliasedLayer and AliasedImageView  ( for antialiasing disabling the use of CGContextSetShouldAntialias and CGContextSetAllowsAntialiasing )
This is approximate code, there have been many attempts to change the code to correct image distortion. Same result.
@implementation AliasedLayer
-(id)init
self = [super init];
if (self) {
     img = [UIImage imageNamed:@"logo.png"];
return self;
-(void)drawInContext:(CGContextRef)context
CGContextSetAllowsAntialiasing(context, false);
CGContextSetShouldAntialias(context, false);
CGContextDrawImage(context, CGRectMake(0., 0., 55., 18.), [img CGImage]);
- (void)renderInContext:(CGContextRef)ctx
CGContextSetAllowsAntialiasing(ctx, false);
CGContextSetShouldAntialias(ctx, false);
@end
@implementation AliasedImageView
- (id)initWithFrame:(CGRect)frame{
    if (self = [super initWithFrame:frame]) {
        [self setClearsContextBeforeDrawing:YES];
self.backgroundColor = [UIColor clearColor];
    return self;
-(void)setImage:(UIImage *)img
[image release];
image = img;
[image retain];
- (void)setNeedsDisplay{
    [self setNeedsDisplayInRect:self.frame];
-(void)dealloc
[image release];
[super dealloc];
+(Class)layerClass
return [AliasedLayer class];
- (void)drawRect:(CGRect)rect
[super drawRect:rect];
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSetInterpolationQuality(ctx, kCGInterpolationHigh);
CGContextSetAllowsAntialiasing(ctx, false);
CGContextSetShouldAntialias(ctx, false);
CGContextDrawImage(ctx, rect, [image CGImage]);
-(void)awakeFromNib
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSetAllowsAntialiasing(ctx, false);
CGContextSetShouldAntialias(ctx, false);
[super awakeFromNib];
@end
There have been attempts to dynamically load the image as well as using xib file. Same result - logo image is distorted.
Any ideas on what is causing this and how to fix it?

Answer 1

In xib file, you have image view. Click on, and try to change the mode in View. Your logo image is perhaps distorted because you are in "Scall to fill"... Try "Aspect Fit".