KentarouKanno/UIImage.md

## UIImage.md

      
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              UIImage.md
            
          
    UIImage

★　UIImage Extension リサイズメソッド
extension UIImage {
    func resize(size: CGSize) -> UIImage {
        let widthRatio = size.width / self.size.width
        let heightRatio = size.height / self.size.height
        let ratio = (widthRatio < heightRatio) ? widthRatio : heightRatio
        let resizedSize = CGSize(width: (self.size.width * ratio), height: (self.size.height * ratio))
        
        // 画質を落とさないように設定
        UIGraphicsBeginImageContextWithOptions(resizedSize, false, 0.0)
        drawInRect(CGRect(x: 0, y: 0, width: resizedSize.width, height: resizedSize.height))
        let resizedImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return resizedImage
    }
}