在iPhone上将多张图片合并成一张图片

Question

我希望合并多张不同大小和不同位置的图像。

我想把它们全部合并到一起，保存在一个副本(图像)中。

那么我该如何将这些图像合并成一张图像呢？

- Haresh Ghatala

---

请查看以下内容：https://dev59.com/DGox5IYBdhLWcg3wcT3r 和 https://dev59.com/OGMl5IYBdhLWcg3wmn84 - Piyush Dubey

Answer 1

我找到了一个非常简单的解决方案。

你可以通过创建以下方法来合并多个图像。

- (BOOL) mergedImageOnMainImage:(UIImage *)mainImg WithImageArray:(NSArray *)imgArray AndImagePointArray:(NSArray *)imgPointArray
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    UIGraphicsBeginImageContext(mainImg.size);

    [mainImg drawInRect:CGRectMake(0, 0, mainImg.size.width, mainImg.size.height)];
    int i = 0;
    for (UIImage *img in imgArray) {
        [img drawInRect:CGRectMake([[imgPointArray objectAtIndex:i] floatValue],
                                   [[imgPointArray objectAtIndex:i+1] floatValue],
                                   img.size.width,
                                   img.size.height)];

        i+=2;
    }

    CGImageRef NewMergeImg = CGImageCreateWithImageInRect(UIGraphicsGetImageFromCurrentImageContext().CGImage,
                                                          CGRectMake(0, 0, mainImg.size.width, mainImg.size.height));

    UIGraphicsEndImageContext();
    [pool release];

    if (NewMergeImg == nil) {
        return NO;
    }
    else {
        UIImageWriteToSavedPhotosAlbum([UIImage imageWithCGImage:NewMergeImg], self, nil, nil);
        return YES;
    }
}

现在以以下的方式调用此方法。

NSArray *imgArray = [[NSArray alloc] initWithObjects:
                         [UIImage imageNamed:@"image06.png"],
                         [UIImage imageNamed:@"image07.png"],
                         [UIImage imageNamed:@"image08.png"],
                         [UIImage imageNamed:@"image09.png"],
                         [UIImage imageNamed:@"BackBtn.png"],
                         [UIImage imageNamed:@"Facebook.png"], nil];

NSArray *imgPointArray = [[NSArray alloc] initWithObjects:
                          @"10", @"10",
                          @"10", @"25",
                          @"30", @"15",
                          @"30", @"50",
                          @"20", @"80",
                          @"25", @"100", nil];


BOOL suc = [self mergedImageOnMainImage:[UIImage imageNamed:@"img001.png"] WithImageArray:imgArray AndImagePointArray:imgPointArray];

if (suc == YES) {
    NSLog(@"Images Successfully Mearged & Saved to Album");
}
else {
    NSLog(@"Images not Mearged & not Saved to Album");
}

- Haresh Ghatala

---

imgPointArray是指什么？它是要从图像中提取并添加到主图像的“左上角”x，y坐标吗？ - Praxiteles

@Praxiteles 这是你想要将数组图像放置在主图像上方的位置。也就是说，它是用于定位你的数组图像的位置。 - Haresh Ghatala

Answer 2

你可以使用CIImage来实现这个功能，

-(UIImage *)mergeTwoImage:(UIImage*)image1 andImage2:(UIImage *)image2
{

    CIImage *topImage = [[CIImage alloc]initWithImage:image1];
    CIImage *backgroundImage = [[CIImage alloc]initWithImage:image2];
    CIFilter *darkenFilter = [CIFilter filterWithName:@"CIDarkenBlendMode" keysAndValues:kCIInputImageKey,topImage,
                          @"inputBackgroundImage",backgroundImage,nil];

    CIImage *resultOfFilter = darkenFilter.outputImage;

    CIContext *ctx = [CIContext contextWithOptions:nil];
    CGImageRef imageToReturn = [ctx createCGImage:resultOfFilter fromRect:resultOfFilter.extent];

    UIImage *outputImage = [UIImage imageWithCGImage:imageToReturn];
    CGImageRelease(imageToReturn);
    imageToReturn = nil;

    return outputImage;
}

- user4003752

Answer 3

你可以使用这段代码：-

    - (IBAction) mergeImage:(id)sender
{
            UIImage *framedImage = firstImageView.image;

            CGSize size = CGSizeMake(firstImageView.frame.size.width, firstImageView.frame.size.height);

            UIGraphicsBeginImageContextWithOptions(size, self.view.alpha, 0.0);

            UIImage *imageToPlace = secondImageView.image;

            [framedImage drawInRect:CGRectMake(0, 0, firstImageView.frame.size.width, firstImageView.frame.size.height)];

            [imageToPlace drawInRect:CGRectMake(18, 25, 242, 243)]; 

            UIImage *imageC = UIGraphicsGetImageFromCurrentImageContext();

            UIGraphicsEndImageContext();

            UIImageView *newImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, framedImage.size.width,framedImage.size.height)];

            newImageView.image = imageC;

            newImageView.contentMode = UIViewContentModeScaleAspectFill;
}

这是用于合并两个UIImageView成一个的代码。同样适用于多张图片。您需要根据您的尺寸合并多张图片。

- Gurpreet