在iphone中以编程方式将两个图像合并到一个图像
你好，我正在开发的应用程序需要合并两个图像，我的图像大小是320 * 240通过合并图像我想大小为320 * 480。 我该如何做这个程序。 以下是图片
================================================== =================================
刚刚testing过这个，根据你正在处理的图像的大小创build你的上下文，并将它们放在彼此的顶部（假设它们是相同的宽度）：
UIImage *image1 = [UIImage imageNamed:@"image1.png"]; UIImage *image2 = [UIImage imageNamed:@"image2.png"]; CGSize size = CGSizeMake(image1.size.width, image1.size.height + image2.size.height); UIGraphicsBeginImageContext(size); [image1 drawInRect:CGRectMake(0,0,size.width, image1.size.height)]; [image2 drawInRect:CGRectMake(0,image1.size.height,size.width, image2.size.height)]; UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); //Add image to view UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, finalImage.size.width, finalImage.size.height)]; imageView.image = finalImage; [self.view addSubview:imageView];
为了避免降低图像质量，请使用UIGraphicsBeginImageContextWithOptions 。
如果您指定的值为0.0，则缩放系数将设置为设备主屏幕的缩放系数。
UIImage *image1 = [UIImage imageNamed:@"image1.png"]; UIImage *image2 = [UIImage imageNamed:@"image2.png"]; CGSize size = CGSizeMake(image1.size.width, image1.size.height + image2.size.height); UIGraphicsBeginImageContextWithOptions(size, false, 0.0) // Use this call [image1 drawInRect:CGRectMake(0,0,size.width, image1.size.height)]; [image2 drawInRect:CGRectMake(0,image1.size.height,size.width, image2.size.height)]; UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); //Add image to view UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, finalImage.size.width, finalImage.size.height)]; imageView.image = finalImage; [self.view addSubview:imageView];
Swift版本
func getMixedImg(image1: UIImage, image2: UIImage) -> UIImage { var size = CGSizeMake(image1.size.width, image1.size.height + image2.size.height) UIGraphicsBeginImageContext(size) image1.drawInRect(CGRectMake(0,0,size.width, image1.size.height)) image2.drawInRect(CGRectMake(0,image1.size.height,size.width, image2.size.height)) var finalImage = UIGraphicsGetImageFromCurrentImageContext() UIGraphicsEndImageContext() return finalImage }
你会得到你的形象来调用这个函数：
var myimage1 = UIImage(named: "image1.png") var myimage2 = UIImage(named: "image2.png") var finalMixedImage = getMixedImg(myimage1!, image2: myimage2!)
您可以使用两个不同的图像视图，并分配两个不同的图像。
UIImage *Image1 = [[UIImage alloc] initWithData:data]; UIImage *Image2 = [[UIImage alloc] initWithData:data]; // Set up width height with values. CGSize newSize = CGSizeMake(width, height); UIGraphicsBeginImageContext( newSize ); [Image1 drawInRect:CGRectMake(0,0,newSize.width,newSize.height)]; [Image2 drawInRect:CGRectMake(newSize.width,newSize.height,newSize.width,newSize.height*2) blendMode:kCGBlendModeNormal alpha:1.0]; UIImage *mergedImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext();
我认为你必须得到ypur图像的背景，然后把它加以说明。
UIImage *eyes = [UIImage imageNamed:@"eyes"]; UIGraphicsBeginImageContext(CGSizeMake(m, n)); CGContextRef context1 = UIGraphicsGetCurrentContext(); UIImage *mouth = [UIImage imageNamed:@"mouth"]; UIGraphicsBeginImageContext(CGSizeMake(m, n)); CGContextRef context2 = UIGraphicsGetCurrentContext();
通过绘制具有不同边界的上下文进行合并
#pragma mark - merging two images -(void)mergeimage :(UIImage*)firstImage withImage:(UIImage*)secondImage{ CGSize size = CGSizeMake(MAX(firstImage.size.width, secondImage.size.width), MAX(firstImage.size.height, secondImage.size.height)); UIGraphicsBeginImageContext(size); [firstImage drawInRect:CGRectMake(self.view.frame.origin.x,self.view.frame.origin.y,size.width/2,size.height)]; [secondImage drawInRect:CGRectMake(self.view.frame.origin.x+(size.width/2),self.view.frame.origin.y,size.width/2,size.height)]; UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); }
Swift 3：
接受一个图像数组，并返回一个在另一个上面的图像的图像，考虑到最大尺寸，所以它没有任何损失
func combineTopToBottom(imagesArray:[UIImage]) -> UIImage? { var dimensions = CGSize(width: 0.0, height: 0.0) for image in imagesArray { dimensions.width = max(dimensions.width, image!.size.width) dimensions.height += max(dimensions.height, image!.size.height) } UIGraphicsBeginImageContext(dimensions) var lastY = CGFloat(0.0) for image in imagesArray { image?.draw(in:CGRect(x: 0, y: lastY, width: dimensions.width, height: image!.size.height)) lastY += image!.size.height } let finalImage = UIGraphicsGetImageFromCurrentImageContext() UIGraphicsEndImageContext() return finalImage }
此实现适用于可变参数，因此您可以传递无限数量的图像以进行垂直合并：
public static func mergeVertically(images: UIImage...) -> UIImage? { let maxWidth = images.reduce(0.0) { max($0, $1.size.width) } let totalHeight = images.reduce(0.0) { $0 + $1.size.height } UIGraphicsBeginImageContextWithOptions(CGSize(width: maxWidth, height: totalHeight), false, 0.0) defer { UIGraphicsEndImageContext() } let _ = images.reduce(CGFloat(0.0)) { $1.draw(in: CGRect(origin: CGPoint(x: 0.0, y: $0), size: $1.size)) return $0 + $1.size.height } return UIGraphicsGetImageFromCurrentImageContext() }
//添加了Swift 3.2和4.0
@IBOutlet weak var imgCamera1: UIImageView! @IBOutlet weak var imgCamera2: UIImageView! let image1 = imgCamera1.image let image2 = imgCamera2.image let size = CGSize(width: image1?.size.width ?? 0.0, height: (image1?.size.height)! + (image2?.size.height)!) UIGraphicsBeginImageContext(size) image1?.draw(in: CGRect(x: 0, y: 0, width: size.width, height: image1?.size.height ?? 0.0)) image2?.draw(in: CGRect(x: 0, y: image1?.size.height ?? 0.0, width: size.width, height: image2?.size.height ?? 0.0)) let finalImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); //Add image to view let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: finalImage?.size.width ?? 0.0, height: finalImage?.size.height ?? 0.0)) imageView.image = finalImage //Displaying Image // view.addSubview(imageView)