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POAnti-aliasing custom bar button image in iOS
 

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  1. POAnti-aliasing custom bar button image in iOS
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    <p>I'm trying to use a custom bar button image. I've created a simple PNG image with a white object and a transparent background as <a href="http://developer.apple.com/library/ios/documentation/userexperience/conceptual/mobilehig/IconsImages/IconsImages.html#//apple_ref/doc/uid/TP40006556-CH14-SW8" rel="nofollow noreferrer">recommended by Apple</a>:</p> <p><img src="https://i.stack.imgur.com/7yoph.png" alt="enter image description here"></p> <p>As you can see, there is no anti-aliasing being applied (that is my exact image, pixel for pixel).</p> <p>Apple does recommend to use Anti-aliasing, but don't provide any more detail. I would have thought this would be a function of the software like it would with text, rather than pre-applying it to the image.</p> <p>The question is--how can I programatically provide anti-aliasing for my custom bar button images?</p> <p>I have tried several things but nothing is doing it for me. Here's one thing I tried:</p> <pre><code>- (UIImage *)antialiasedImage { // Check to see if Antialiased Image has already been initialized if (_antialiasedImage != nil) { return _antialiasedImage; } // Get Device Scale CGFloat scale = [[UIScreen mainScreen] scale]; // Get the Image from Resource UIImage *buttonImage = [UIImage imageNamed:@"ReferenceFieldIcon"]; // .png??? // Get the CGImage from UIImage CGImageRef imageRef = [buttonImage CGImage]; // Find width and height NSUInteger width = CGImageGetWidth(imageRef); NSUInteger height = CGImageGetHeight(imageRef); // Begin Context UIGraphicsBeginImageContextWithOptions(buttonImage.size, YES, 0); CGContextRef context = UIGraphicsGetCurrentContext(); // Set Antialiasing Parameters CGContextSetAllowsAntialiasing(context, YES); CGContextSetShouldAntialias(context, YES); CGContextSetInterpolationQuality(context, kCGInterpolationHigh); // Draw Image Ref on Context CGContextDrawImage(context, CGRectMake(0, 0, width, height), imageRef); // End Context UIGraphicsEndImageContext(); // Set CGImage to UIImage _antialiasedImage = [UIImage imageWithCGImage:imageRef scale:scale orientation:UIImageOrientationUp]; // Release Image Ref CGImageRelease(imageRef); return _antialiasedImage; } </code></pre> <p>Then I create my Segmented Control Like So:</p> <pre><code>- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. NSArray *centerItemsArray = [NSArray arrayWithObjects: @"S", self.antialiasedImage, @"D", nil]; UISegmentedControl *centerSegCtrl = [[UISegmentedControl alloc] initWithItems:centerItemsArray]; centerSegCtrl.segmentedControlStyle = UISegmentedControlStyleBar; UIBarButtonItem *centerButtonItem = [[UIBarButtonItem alloc] initWithCustomView:(UIView *)centerSegCtrl]; UIBarButtonItem *flexibleSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil]; NSArray *barArray = [NSArray arrayWithObjects: flexibleSpace, centerButtonItem, flexibleSpace, nil]; [self setToolbarItems:barArray]; } </code></pre> <p>Thank you in advance!</p>
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