Question

我想知道如何将2张图片保存到1张图片中。

其中一张照片可以移动，旋转和放大/缩小......

我这样做，但它基本上捕获了屏幕上的所有内容，包括我的按钮......

UIGraphicsBeginImageContext(self.view.bounds.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *savedImg = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

Answer 1

您可以创建图形上下文并在其中绘制两个图像。您将从两个源图像组合中获得图像结果。

- (UIImage*)imageByCombiningImage:(UIImage*)firstImage withImage:(UIImage*)secondImage {
    UIImage *image = nil;

    CGSize newImageSize = CGSizeMake(MAX(firstImage.size.width, secondImage.size.width), MAX(firstImage.size.height, secondImage.size.height));
    if (UIGraphicsBeginImageContextWithOptions != NULL) {
        UIGraphicsBeginImageContextWithOptions(newImageSize, NO, [[UIScreen mainScreen] scale]);
    } else {
        UIGraphicsBeginImageContext(newImageSize); 
    }
    [firstImage drawAtPoint:CGPointMake(roundf((newImageSize.width-firstImage.size.width)/2), 
                                        roundf((newImageSize.height-firstImage.size.height)/2))]; 
    [secondImage drawAtPoint:CGPointMake(roundf((newImageSize.width-secondImage.size.width)/2), 
                                         roundf((newImageSize.height-secondImage.size.height)/2))]; 
    image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return image;
}

Answer 2

// Objective-C

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();

//set finalImage to IBOulet UIImageView
imageView.image = finalImage;

// Swift

let topImage = UIImage(named: "image1.png")
let bottomImage = UIImage(named: "image2.png")

let size = CGSize(width: topImage!.size.width, height: topImage!.size.height + bottomImage!.size.height)
UIGraphicsBeginImageContextWithOptions(size, false, 0.0)

topImage!.draw(in: CGRect(x: 0, y: 0, width: size.width, height: topImage!.size.height))
bottomImage!.draw(in: CGRect(x: 0, y: topImage!.size.height, width: size.width, height: bottomImage!.size.height))

let newImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()

//set finalImage to IBOulet UIImageView
mergeImage.image = newImage

Answer 3

创建用于添加图像的子视图。
在该视图中添加所有图片，而不是主视图。
让按钮和其他东西留在主视图上。
仅渲染位图上下文中带有图像的视图，而不是像现在这样在主视图中渲染。

Answer 4

您可以使用此方法，这是非常动态的，您可以指定第二个图像的起始位置和图像的总大小。

-(UIImage *) addImageToImage:(UIImage *)img withImage2:(UIImage *)img2 andRect:(CGRect)cropRect withImageWidth:(int) width     
{

    CGSize size = CGSizeMake(width,40);
    UIGraphicsBeginImageContext(size);

    CGPoint pointImg1 = CGPointMake(0,0);
    [img drawAtPoint:pointImg1];

     CGPoint pointImg2 = cropRect.origin;
     [img2 drawAtPoint: pointImg2];

     UIImage* result = UIGraphicsGetImageFromCurrentImageContext();
     UIGraphicsEndImageContext();
     return result;
}

Answer 5

Swift 3

在此示例中，使用20％边距的insetBy在另一个图像内绘制frontImage。

必须先按顺序绘制背景图像，然后依次绘制正面图像。

我用它在UIImageView中的视频帧图像前面放置一个“播放”图标图像，如下所示：

<强>用法：

self.image = self.mergedImageWith(frontImage: UIImage.init(named: "play.png"), backgroundImage: UIImage.init(named: "backgroundImage.png")))

方式：

func mergedImageWith(frontImage:UIImage?, backgroundImage: UIImage?) -> UIImage{ if (backgroundImage == nil) { return frontImage! } let size = self.frame.size UIGraphicsBeginImageContextWithOptions(size, false, 0.0) backgroundImage?.draw(in: CGRect.init(x: 0, y: 0, width: size.width, height: size.height)) frontImage?.draw(in: CGRect.init(x: 0, y: 0, width: size.width, height: size.height).insetBy(dx: size.width * 0.2, dy: size.height * 0.2)) let newImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()! UIGraphicsEndImageContext() return newImage }

Answer 6

这是UIImage扩展组合多个图像的方法：

class func combine(images: UIImage...) -> UIImage {
    var contextSize = CGSizeZero

    for image in images {
        contextSize.width = max(contextSize.width, image.size.width)
        contextSize.height = max(contextSize.height, image.size.height)
    }

    UIGraphicsBeginImageContextWithOptions(contextSize, false, UIScreen.mainScreen().scale)

    for image in images {
        let originX = (contextSize.width - image.size.width) / 2
        let originY = (contextSize.height - image.size.height) / 2

        image.drawInRect(CGRectMake(originX, originY, image.size.width, image.size.height))
    }

    let combinedImage = UIGraphicsGetImageFromCurrentImageContext()

    UIGraphicsEndImageContext()

    return combinedImage
}

示例：

UIImage.combine(image1, image2)

Answer 7

Swift-3（ IOS10.3 ）

extension UIImage {
    func combineWith(image: UIImage) -> UIImage {
        let size = CGSize(width: self.size.width, height: self.size.height + image.size.height)
        UIGraphicsBeginImageContextWithOptions(size, false, 0.0)

        self.draw(in: CGRect(x:0 , y: 0, width: size.width, height: self.size.height))
        image.draw(in: CGRect(x: 0, y: self.size.height, width: size.width,  height: image.size.height))

        let newImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()

        return newImage
    }
}

<强> 用法

let image1 = UIImage(named: "image1.jpg")
let image2 = UIImage(named: "image2.jpg")

yourImageView.image = image1?.combineWith(image: image2)

Answer 8

根据Himanshu padia的反应

如果您要“动态”将更多图片（长宽比相同）组合到Objective-C的一个网格中

在本示例中，我仅在偶数/奇数插槽中使用了两个。

相等的内嵌线和轮廓线的公式：

// psx = (x - (n+1)*bs / n)
// psy = (y - (m+1)*bs / m)

用于不同内联和轮廓边框的公式

// psx = (x - (n-1)*bs + obs / n)
// psy = (y - (m-1)*bs + obs / m)

说明：

psx，psy-尺寸X和y
x，y-原始（张）图像尺寸
n，m-网格中的插槽
bs-边框大小
obs-轮廓边框大小
为什么n + 1？因为三块需要四个边框 |*|*|*|
为什么要n-1？因为与上述相同，但排除了第一个和最后一个边框 !*|*|*!

代码：

UIImage *image1 = [UIImage imageNamed:@"14x9blue"];
UIImage *image2 = [UIImage imageNamed:@"14x9red"];

// grid parameters
int k =0;
int m=3,n = 3;
int i=0, j=0;

CGFloat borderSize = 20.0f;
//  equal border inline and outline
// the 1 is a multiplier for easier and more dynamic sizes
// 0*borderSize is inline border only, 1 is equal, 2 is double, etc.
CGFloat outlineBorder = 1*borderSize;

CGSize size = CGSizeMake(self.gridImageView.image.size.width, self.gridImageView.image.size.height);
CGRect gridImage = CGRectMake(0,0, size.width, size.height);


// piece size
// border inline and outline    
// psx = (x - (n-1)*bs + obs / n)
// psy = (y - (m-1)*bs + obs / m)
CGFloat pieceSizeX = (size.width - (n-1)*borderSize - 2*outlineBorder) / n;
CGFloat pieceSizeY = (size.height - (m-1)*borderSize - 2*outlineBorder) / m;




UIGraphicsBeginImageContext(size);
// semi transparent fill
[[UIColor colorWithDisplayP3Red:240 green:250 blue:0 alpha:0.5] setFill];
UIRectFill(CGRectMake(0,0, size.width, size.height));

UIImage *currentImage;
for(i=0; i<m; i++) {
    for (j=0; j<n; j++) {
        if (k++%2) {
            currentImage = image1;
        } else {
            currentImage = image2;
        }
        // 10-60 , 70-120, 130-180
        [currentImage drawInRect:CGRectMake(
                outlineBorder + (i)*borderSize + i*pieceSizeX,
                outlineBorder + (j)*borderSize + j*pieceSizeY,
                pieceSizeX,
                pieceSizeY
        )
        ];
    }
}

UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

//set finalImage to IBOulet UIImageView
self.gridImageView.image = finalImage;

如何将2个图像合并/合并为1个

8 个答案: