這個屬性很有意思自己可以看看,點選這裡檢視文章

下面是一個方法改變圖片的顏色的方法

func drawImageColor(image: UIImage,color: UIColor) -> UIImage {
    
    UIGraphicsBeginImageContextWithOptions(image.size, false, UIScreen.mainScreen().scale);
    color.setFill();
    let bounds = CGRectMake(0, 0, image.size.width, image.size.height);
    UIRectFill(bounds);
    image.drawInRect(bounds, blendMode: CGBlendMode.DestinationIn, alpha: 1);
    let newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return newImage;
}
 

文章連結: https://onevcat.com/2013/04/using-blending-in-ios/