Question

我面临以下问题：由于合并，我必须合并两个图像A和B以创建新图像C. 第一张图像（A）是一个.png，它是我拍摄的第二张图片（B）。如何将这两个图像合并为一个新的（C），其大小与第一个（A）相同？

我试过这段代码：

var bottomImage: UIImage = polaroidFoto.image!
var image: UIImage = immaginePropria.image!
var newSize: CGSize = CGSizeMake(300, 300)
UIGraphicsBeginImageContext(newSize)
bottomImage.drawInRect(CGRectMake(0, 0, newSize.width, newSize.height))
image.drawInRect(CGRectMake(0, 0, newSize.width, newSize.height), blendMode: kCGBlendModeNormal, alpha: 0.8) //0.8 default
var newImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()

但是这个给我一个新的图像（C），但是对它有alpha效果，我希望图像（A）保持在图像上（B）并将这两个合并为一个新的（C）！谢谢！

更新有人可以尝试更正此代码：

func maskImage(image: UIImage, withMask maskImage: UIImage) -> UIImage {
var colorSpace: CGColorSpaceRef = CGColorSpaceCreateDeviceRGB()
var maskImageRef: CGImageRef = maskImage.CGImage()
var mainViewContentContext: CGContextRef = CGBitmapContextCreate(Nil, maskImage.size.width, maskImage.size.height, 8, 0, colorSpace, kCGImageAlphaPremultipliedFirst)
CGColorSpaceRelease(colorSpace)
if mainViewContentContext == nil {
    return nil
}
var ratio: CGFloat = 0
ratio = maskImage.size.width / image.size.width
if ratio * image.size.height < maskImage.size.height {
    ratio = maskImage.size.height / image.size.height
}
var rect1: CGRect = 00maskImage.size.widthmaskImage.size.height
var rect2: CGRect = -((image.size.width * ratio) - maskImage.size.width) / 2-((image.size.height * ratio) - maskImage.size.height) / 2image.size.width * ratioimage.size.height * ratio
CGContextClipToMask(mainViewContentContext, rect1, maskImageRef)
CGContextDrawImage(mainViewContentContext, rect2, image.CGImage)
var newImage: CGImageRef = CGBitmapContextCreateImage(mainViewContentContext)
CGContextRelease(mainViewContentContext)
var theImage: UIImage = UIImage.imageWithCGImage(newImage)
CGImageRelease(newImage)
return theImage }

这个可能有用，但语法充满了错误！谢谢！

Answer 1

请尝试使用以下代码来帮助您。

 func maskImage(image: UIImage, withMask maskImage: UIImage) -> UIImage {

    let maskRef = maskImage.CGImage

    let mask = CGImageMaskCreate(
        CGImageGetWidth(maskRef),
        CGImageGetHeight(maskRef),
        CGImageGetBitsPerComponent(maskRef),
        CGImageGetBitsPerPixel(maskRef),
        CGImageGetBytesPerRow(maskRef),
        CGImageGetDataProvider(maskRef),
        nil,
        false)

    let masked = CGImageCreateWithMask(image.CGImage, mask)
    let maskedImage = UIImage(CGImage: masked)!

    // No need to release. Core Foundation objects are automatically memory managed.

    return maskedImage

}

然后按照以下方式拨打电话：

var imageA : UIImage = UIImage(named:"YourImageName")!
var imageB : UIImage = UIImage(named:"YourImageName")!

var maskedImage: UIImage = self.maskImage(imageA, withMask: imageB)

快速合并两个不同的图像

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