I’m not aware of anything you can embed in the image data itself to tell the phone that it’s a @2x image, but something like this should work: UIImage * img = …; img = [UIImage imageWithCGImage:img.CGImage scale:2 orientation:img.imageOrientation];
I finally found out the answer. Apparently the UIImage methods strip out metadata and so using UIImageWriteToSavedPhotosAlbum is no good. However in ios4 Apple put in a new framework to handle the photo library called the ALAssetsLibrary. First you need to right click on the Targets and in the build part, add the AlAsset Framework … Read more
You can open an image context, and then harvest its content immediately, without drawing anything into it. This should produce a blank 36×36 UIImage: UIGraphicsBeginImageContextWithOptions(CGSizeMake(36, 36), NO, 0.0); UIImage *blank = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext();
The accepted answer is correct, but there is a much more easy way for UIImageView: Obj-C: UIImage *image = [UIImage imageNamed:@”foo.png”]; theImageView.image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate]; [theImageView setTintColor:[UIColor redColor]]; Swift 2: let theImageView = UIImageView(image: UIImage(named:”foo”)!.imageWithRenderingMode(UIImageRenderingMode.AlwaysTemplate)) theImageView.tintColor = UIColor.redColor() Swift 3: let theImageView = UIImageView(image: UIImage(named:”foo”)!.withRenderingMode(.alwaysTemplate)) theImageView.tintColor = UIColor.red
You don’t have to encode it. Simply make a NSUrl, it knows the “data:”-url. NSURL *url = [NSURL URLWithString:base64String]; NSData *imageData = [NSData dataWithContentsOfURL:url]; UIImage *ret = [UIImage imageWithData:imageData]; As mentioned in the comments, you have to make sure that you prepend your data with data:image/png;base64, or else your base64 data is useless.
Objective-C: -(CGRect)frameForImage:(UIImage*)image inImageViewAspectFit:(UIImageView*)imageView { float imageRatio = image.size.width / image.size.height; float viewRatio = imageView.frame.size.width / imageView.frame.size.height; if(imageRatio < viewRatio) { float scale = imageView.frame.size.height / image.size.height; float width = scale * image.size.width; float topLeftX = (imageView.frame.size.width – width) * 0.5; return CGRectMake(topLeftX, 0, width, imageView.frame.size.height); } else { float scale = imageView.frame.size.width / image.size.width; float … Read more
I used this single line of code to create a new UIImage which is scaled. Set the scale and orientation params to achieve what you want. The first line of code just grabs the image. // grab the original image UIImage *originalImage = [UIImage imageNamed:@”myImage.png”]; // scaling set to 2.0 makes the image 1/2 the … Read more
No. But you can easily add an image view as the accessory view to a table cell for the same effect. UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@”foo.png”]]; cell.accessoryView = imageView; [imageView release];
This is a general answer for the sake of future viewers. It is based on the question title rather than the details of the original question. How to add a UIImage to a CALayer You can add an image to a view’s layer simply by using its contents property: myView.layer.contents = UIImage(named: “star”)?.cgImage Note that … Read more
Just use the size property of UIImage, for example: NSURL *url = [NSURL URLWithString:path]; NSData *data = [NSData dataWithContentsOfURL:url]; UIImage *img = [[UIImage alloc] initWithData:data]; CGSize size = img.size;