Created
March 28, 2019 17:19
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Example of using AVFoundation's AVMakeRect to resize and image
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| /* create the image at original size */ | |
| let image = UIImage(named: "Landscape-1276x800.jpg")! | |
| /* | |
| * create bounding rect with largest possible height based on width | |
| * this will get you the aspect height for the speficied width | |
| */ | |
| let boundingRect = CGRect(x: 0, y: 0, width: 300, height:CGFloat.greatestFiniteMagnitude) | |
| /* | |
| * Returns a scaled CGRect that maintains the aspect ratio specified | |
| * by a CGSize within a bounding CGRect | |
| */ | |
| let aspectRect = AVMakeRect(aspectRatio: image1.size, insideRect: boundingRect) | |
| /* create a UIGraphicsImageRenderer to draw the image */ | |
| let renderer = UIGraphicsImageRenderer(size: aspectRect.size) | |
| /* | |
| WARNING be careful about the origin points, if the result of the calculation is an exponential value like | |
| 8.988465674311579e+307, then the image won't draw. To be safe I set the origin to .zero | |
| */ | |
| let img = renderer.image { (context) in | |
| image.draw(in: CGRect(origin: .zero, size: aspectRect.size)) | |
| } |
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this is great snippet!