由于在进行图像处理时大量使用内存，我的应用程序崩溃了。
基本上我的整个应用程序依赖于以下方法，其中使用另一种方法来组合图像的逻辑用于从包中加载图像。
+ (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;
}
以上方法多次从以下方法调用
- (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];
}
}
}
当上述方法被称为内存使用量超过400 mb＆amp;我在控制台和放大器中收到2到3次收到内存警告信息我的应用程序在此之后崩溃了。
在运行时，当执行内存中的上述方法总是增加时，即使你在上面的方法中看到我也没有所有的uiimage对象＆amp;也使用了@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 *）imageByCombiningImages：（UIImage *）firstImage withImage：（UIImage *）secondImage
在上述方法中，我将两个图像组合成一个图像＆amp;我项目中的所有图像平均大小为2 MB。
如果我降低图像分辨率而不是app的质量正在下降，那么我在4 mb之前将图像的尺寸减小到2 mb。那不是我想要的。我做了一个谷歌关于它＆amp;试图找到堆栈溢出的解决方案，但仍然没有任何结果，所以请指导我完成这个问题。
请建议我如何改进图像合成方法？ ＆安培;我如何优化上述方法？，以便减少内存使用量。我的应用程序可以顺利运行。
答案 0 :(得分：1)
我可以建议的一件事就是不要每次都画出从图形上下文中捕获图像。
请尝试以下步骤：
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，核心图形会创建内部 cg栅格数据以创建位图图像。它会消耗更多的内存。
您可以通过延迟顺序方法调用来合并图像来避免内存警告。
编辑3：
修改后的图像合并方法：
- (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;
}
}
答案 1 :(得分：0)
我会尝试在GPU上进行计算，例如使用GPUImage的blend filters之一。