Ios iPad应用程序在合并/合并两幅图像时因内存警告而崩溃

我的应用程序正在崩溃，因为我在进行图像处理时大量使用了内存

基本上，我的整个应用程序都依赖于下面的方法，其中使用了用于组合图像的逻辑，这是我用于从bundle加载图像的另一种方法

+ (UIImage*)imageByCombiningImages:(UIImage*)firstImage withImage:(UIImage*)secondImage
{
    @autoreleasepool
    {
        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))];

        firstImage =nil;
        [secondImage drawAtPoint:CGPointMake(roundf((newImageSize.width-secondImage.size.width)/2), roundf((newImageSize.height-secondImage.size.height)/2))];


        secondImage=nil;

        image = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        return image;
    }
}

- (UIImage*) getImage:(NSString*)imagename
{
    NSString *fileName = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:imagename];
    UIImage *image = [UIImage imageWithContentsOfFile:fileName];
    return image;
}

下面的方法多次调用上述方法

- (void) applyMaterialWithValue:(NSDictionary*)dict
{

    @synchronized(self)
    {

        NSString *materialName = [dict valueForKey:@"material"];
        NSString *optionName = [dict valueForKey:@"option"];
        //NSString *preset_Name = [dict valueForKey:@"preset"];
        NSString *name = [dict valueForKey:@"name"];
        if([[GlobalIntVariable getCMFScheme] isEqualToString:@"preset1"])

        {
            if(!isMetalPressed)
            {

                [GlobalIntVariable setCurrentMaterialName:@"Preset 1 Metal Plating"];
            }
            if(!isLeatherPressed)
            {
                [GlobalIntVariable setCurrentPresetName:@"preset1"];

            }

        }
        if([[GlobalIntVariable getCMFScheme] isEqualToString:@"preset2"])

        {

            if(!isMetalPressed)
            {

                [GlobalIntVariable setCurrentMaterialName:@"Preset 2 Metal Plating"];
            }
            if(!isLeatherPressed)
            {
                [GlobalIntVariable setCurrentPresetName:@"preset2"];

            }

        }

        if ([materialName isEqualToString:AREAD4METALCOMPONENET ]|| [materialName isEqualToString:AREA8METALCOMPONENET])
        {
            [GlobalIntVariable setCurrentMaterialName:name];
        }


        if([optionName isEqualToString:OPTION0])
        {
            @autoreleasepool
            {

                UIImage *presetImg1L1Standard = [APP_DEL getImage:[dict valueForKey:@"image1L1Standard"]];
                imgView1Layout1Standard.image = [ImageOperations imageByCombiningImages:imgView1Layout1Standard.image withImage:presetImg1L1Standard];
                imgView1Layout1StandardPSUOn.image = [ImageOperations imageByCombiningImages:imgView1Layout1StandardPSUOn.image withImage:presetImg1L1Standard];
                 presetImg1L1Standard=nil;



                UIImage *presetImg1L1Premium = [APP_DEL getImage:[dict valueForKey:@"image1L1Premium"]];
                imgView1Layout1Premium.image = [ImageOperations imageByCombiningImages:imgView1Layout1Premium.image withImage:presetImg1L1Premium];
                imgView1Layout1PremiumPSUOn.image = [ImageOperations imageByCombiningImages:imgView1Layout1PremiumPSUOn.image withImage:presetImg1L1Premium];
                presetImg1L1Premium=nil;

                UIImage *presetImg1L2Standard = [APP_DEL getImage:[dict valueForKey:@"image1L2Standard"]];
                imgView1Layout2Standard.image = [ImageOperations imageByCombiningImages:imgView1Layout2Standard.image withImage:presetImg1L2Standard];
                imgView1Layout2StandardPSUOn.image = [ImageOperations imageByCombiningImages:imgView1Layout2StandardPSUOn.image withImage:presetImg1L2Standard];
                presetImg1L2Standard=nil;

                UIImage *presetImg1L2Premium = [APP_DEL getImage:[dict valueForKey:@"image1L2Premium"]];
                imgView1Layout2Premium.image = [ImageOperations imageByCombiningImages:imgView1Layout2Premium.image withImage:presetImg1L2Premium];
                imgView1Layout2PremiumPSUOn.image = [ImageOperations imageByCombiningImages:imgView1Layout2PremiumPSUOn.image withImage:presetImg1L2Premium];
                presetImg1L2Premium=nil;

            }

            @autoreleasepool
            {

                UIImage *presetImg2L1Standard = [APP_DEL getImage:[dict valueForKey:@"image2L1Standard"]];
                imgView2Layout1Standard.image = [ImageOperations imageByCombiningImages:imgView2Layout1Standard.image withImage:presetImg2L1Standard];
                imgView2Layout1StandardPSUOn.image = [ImageOperations imageByCombiningImages:imgView2Layout1StandardPSUOn.image withImage:presetImg2L1Standard];
                presetImg2L1Standard=nil;

                UIImage *presetImg2L1Premium = [APP_DEL getImage:[dict valueForKey:@"image2L1Premium"]];
                imgView2Layout1Premium.image = [ImageOperations imageByCombiningImages:imgView2Layout1Premium.image withImage:presetImg2L1Premium];
                imgView2Layout1PremiumPSUOn.image = [ImageOperations imageByCombiningImages:imgView2Layout1PremiumPSUOn.image withImage:presetImg2L1Premium];
                presetImg2L1Premium=nil;

                UIImage *presetImg2L2Standard = [APP_DEL getImage:[dict valueForKey:@"image2L2Standard"]];
                imgView2Layout2Standard.image = [ImageOperations imageByCombiningImages:imgView2Layout2Standard.image withImage:presetImg2L2Standard];
                imgView2Layout2StandardPSUOn.image = [ImageOperations imageByCombiningImages:imgView2Layout2StandardPSUOn.image withImage:presetImg2L2Standard];
                presetImg2L2Standard=nil;

                UIImage *presetImg2L2Premium = [APP_DEL getImage:[dict valueForKey:@"image2L2Premium"]];
                imgView2Layout2Premium.image = [ImageOperations imageByCombiningImages:imgView2Layout2Premium.image withImage:presetImg2L2Premium];
                imgView2Layout2PremiumPSUOn.image = [ImageOperations imageByCombiningImages:imgView2Layout2PremiumPSUOn.image withImage:presetImg2L2Premium];
                presetImg2L2Premium=nil;


            }

            @autoreleasepool
            {

                UIImage *presetImg3L1Standard = [APP_DEL getImage:[dict valueForKey:@"image3L1Standard"]];
                imgView3Layout1Standard.image = [ImageOperations imageByCombiningImages:imgView3Layout1Standard.image withImage:presetImg3L1Standard];
                imgView3Layout1StandardPSUOn.image = [ImageOperations imageByCombiningImages:imgView3Layout1StandardPSUOn.image withImage:presetImg3L1Standard];
                presetImg3L1Standard=nil;

                UIImage *presetImg3L1Premium = [APP_DEL getImage:[dict valueForKey:@"image3L1Premium"]];
                imgView3Layout1Premium.image = [ImageOperations imageByCombiningImages:imgView3Layout1Premium.image withImage:presetImg3L1Premium];
                imgView3Layout1PremiumPSUOn.image = [ImageOperations imageByCombiningImages:imgView3Layout1PremiumPSUOn.image withImage:presetImg3L1Premium];
                presetImg3L1Premium=nil;

                UIImage *presetImg3L2Standard = [APP_DEL getImage:[dict valueForKey:@"image3L2Standard"]];
                imgView3Layout2Standard.image = [ImageOperations imageByCombiningImages:imgView3Layout2Standard.image withImage:presetImg3L2Standard];
                imgView3Layout2StandardPSUOn.image = [ImageOperations imageByCombiningImages:imgView3Layout2StandardPSUOn.image withImage:presetImg3L2Standard];
                presetImg3L2Standard=nil;


                UIImage *presetImg3L2Premium = [APP_DEL getImage:[dict valueForKey:@"image3L2Premium"]];
                imgView3Layout2Premium.image = [ImageOperations imageByCombiningImages:imgView3Layout2Premium.image withImage:presetImg3L2Premium];
                imgView3Layout2PremiumPSUOn.image = [ImageOperations imageByCombiningImages:imgView3Layout2PremiumPSUOn.image withImage:presetImg3L2Premium];
                presetImg3L2Premium=nil;

            }



        }

        @autoreleasepool
        {
            UIImage *presetImg4Standard = [APP_DEL getImage:[dict valueForKey:@"image4Standard"]];
            mainImageView4.image=[ImageOperations imageByCombiningImages:mainImageView4.image withImage:presetImg4Standard];
            presetImg4Standard=nil;

            UIImage *presetImg5Standard = [APP_DEL getImage:[dict valueForKey:@"image5Standard"]];
            mainImageView5.image=[ImageOperations imageByCombiningImages:mainImageView5.image withImage:presetImg5Standard];
             presetImg5Standard=nil;
        }

        @autoreleasepool
        {
            UIImage *presetImg1Detail1 = [APP_DEL getImage:[dict valueForKey:@"image1DetailView1"]];
            imgView1Detail.image = [ImageOperations imageByCombiningImages:imgView1Detail.image withImage:presetImg1Detail1];
             presetImg1Detail1=nil;

            UIImage *presetImg2Detail2 = [APP_DEL getImage:[dict valueForKey:@"image2DetailView2"]];
            imgView2Detail.image = [ImageOperations imageByCombiningImages:imgView2Detail.image withImage:presetImg2Detail2];
            presetImg2Detail2=nil;

             UIImage *presetImg3Detail3 = [APP_DEL getImage:[dict valueForKey:@"image3DetailView3"]];
            imgView3Detail.image = [ImageOperations imageByCombiningImages:imgView3Detail.image withImage:presetImg3Detail3];
            presetImg3Detail3=nil;

        }


        [self setMaterialReflection];

        NSString *strShowIndicator = [dict valueForKey:@"hideIndicator"];
        if ([strShowIndicator isEqualToString:@"YES"]) {
            [appDelegate hideIndicator];
        }



    }
}

问题是，当上述方法调用的内存使用量超过400 mb时，我在控制台中收到2-3倍的内存警告消息，我的应用程序在此之后崩溃

在运行时，当执行上述方法时，内存总是在增加，即使您在上述方法中看到，我也没有所有uiimage对象&也使用@autorelese块，但内存没有释放

我想在每次调用以下方法后减少内存

• （UIImage*）图像通过组合图像：（UIImage*）第一个图像与图像：（UIImage*）第二个图像

在上面的方法中，我将两个图像合并到一个图像中&我的项目中的所有图像的平均大小为2mb

在4MB之前，我已经将图像的平均大小降低到2MB，如果我降低图像分辨率，应用程序的质量就会下降&这不是我想要的

我用谷歌搜索了一下，试图找到解决堆栈溢出的方法，但仍然一无所获，所以请指导我解决这个问题

---

请建议我如何改进图像合成方法如何优化上述方法？这样可以减少内存使用量，我的应用程序可以顺利运行。

我可以建议不要每次都从图形上下文中绘制图像

请尝试以下步骤：

通过组合图像将字典传递给方法ImageBy：

计算框架

迭代字典中的所有图像并绘制

只捕获一次最终图像

编辑1：

编辑方法：

    + (UIImage*)imageByCombiningImages:(NSDictionary *)imageDict
    {
     UIImage *image = nil;

            CGSize newImageSize = CGSizeZero;
    NSArray *allImages = [imageDict allValues];
    for (UIImage *image in allImages) {
    newImageSize  = CGSizeMake(MAX(image.size.width, newImageSize.size.width), MAX(image.size.height, newImageSize.size.height));
    }


            if (UIGraphicsBeginImageContextWithOptions != NULL)
            {
                UIGraphicsBeginImageContextWithOptions(newImageSize, NO, [[UIScreen mainScreen] scale]);
            }
            else
            {
                UIGraphicsBeginImageContext(newImageSize);
            }

    for (UIImage *image in allImages) {
            [image drawAtPoint:CGPointMake(roundf((newImageSize.width-image.size.width)/2), roundf((newImageSize.height-image.size.height)/2))];
    }

image = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        return image;

    }

编辑2：

使用UIGraphicsGetImageFromCurrentImageContext（）创建图像时，核心图形将创建内部cg光栅数据以创建位图图像。它将消耗更多内存

通过延迟顺序方法调用以合并映像，可以避免内存警告

编辑3：

修改的图像合并方法：

- (void)imageByCombiningImages:(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))];

        firstImage =nil;
        [secondImage drawAtPoint:CGPointMake(roundf((newImageSize.width-secondImage.size.width)/2), roundf((newImageSize.height-secondImage.size.height)/2))];


        secondImage=nil;

        image = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();

[self performSelector:@selector(merge:) withObject:image afterDelay:1]; // modify the delay which will work out for you

}

在数组中添加所有图像键并调用该方法

- (void)merge:(UIImage *)image {

    switch (rowIndex) {
        case 0: {
            UIImage *presetImg1L1Standard = [APP_DEL getImage:[dict valueForKey:[imagesArray objectAtIndex:rowIndex]]];
            switch (sectionIndex) {
                case 0:
                    [ImageOperations imageByCombiningImages:imgView1Layout1Standard.image withImage:presetImg1L1Standard];
                    sectionIndex++;
                    break;
                  case 1:
                    imgView1Layout1Standard.image = image;
                    [ImageOperations imageByCombiningImages:imgView1Layout1StandardPSUOn.image withImage:presetImg1L1Standard];
                    rowIndex ++;
                    sectionIndex = 0;
                    break;
                default:
                    break;
            }
        }
            break;
        case 1: {
            UIImage *image = [APP_DEL getImage:[dict valueForKey:[imagesArray objectAtIndex:rowIndex]]];
            switch (sectionIndex) {
                case 0:
                    imgView1Layout1StandardPSUOn.image = image;
                    [ImageOperations imageByCombiningImages:imgView1Layout1Premium.image withImage:image];
                    sectionIndex++;
                    break;
                case 1:
                    imgView1Layout1Premium.image = image;
                    [ImageOperations imageByCombiningImages:imgView1Layout1Premium.image withImage:presetImg1L1Premium];
                    rowIndex ++;
                    sectionIndex = 0;
                    break;
                default:
                        break;
                }
            }
                break;
// ................. and so on
            default:
                break;
        }
    }

---

希望这能给你一个想法。

我会尝试在GPU上进行计算，例如使用一个的。

谢谢你的建议…但我不明白你想说什么…你能通过组合Images:method编辑我的图像吗？这样我就可以在我的code@PRJ如果您需要有关编辑2方法的更多帮助，请随时联系。我将帮助您编写代码片段…但这是我最后一个解决方案，您能给出一些建议如何改进applyMaterialWithValue:method吗？您说过您有内存泄漏（参见标记），但到底是哪一行导致内存泄漏？仪器怎么说？图像的像素有多大？它们以2MB的大小存储（如JPEG、PNG？），并不意味着它们在内存中占用2MB的空间。。。