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[原]逆向iOS SDK -- _UIImageAtPath 的实现（SDK 5.1）

發(fā)布時間：2025/3/15 编程问答 16 豆豆
生活随笔 收集整理的這篇文章主要介紹了 [原]逆向iOS SDK -- _UIImageAtPath 的实现（SDK 5.1） 小編覺得挺不錯的,現(xiàn)在分享給大家,幫大家做個參考.

注釋過的反匯編代碼：http://pan.baidu.com/share/link?shareid=3491166579&uk=537224442

偽代碼（不精確，僅供參考）：

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NSString* _UICacheNameForImageAtPath(NSString *imageName, NSBundle *bundle);

NSString* ProductSuffix();

UIImage* GetImageAtPath(NSString *imageFilePath, CGFloat scale);

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NSMutableDictionary *gCacheNameToImageMap = nil;

NSMutableDictionary *gImageToCacheNameMap = nil;

BOOL __prefer2xImages = NO;

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UIImage *_UIImageAtPath(NSString *imageFileName, NSBundle *mainBundle, BOOL shouldForce1xScale)

{

??? // imageFileName = @"Default.png"

??? if ([imageFileName length] == 0)

??????? returnnil;

???

??? // bundleIdentifier_imageFileName

??? NSString *cacheNameOfImage = _UICacheNameForImageAtPath(imageFileName, mainBundle);

??? UIImage *resultImage = nil;

??? if (gCacheNameToImageMap != nil)

??? {

??????? resultImage = [gCacheNameToImageMapobjectForKey:cacheNameOfImage];

??????? if (resultImage != nil)

??????? {

??????????? if (![resultImage _isCached])

??????????? {

??????????????? [resultImage retain];

??????????? }

???????????

? ??????????[resultImage _setCached:YES];

???????????

??????????? return resultImage;

??????? }

??? }

??? else

??? {

??????? gCacheNameToImageMap = [NSMutableDictionarydictionary];

??????? gImageToCacheNameMap = [NSMutableDictionarydictionary];

??? }

???

??? BOOL force1xScale = NO;

??? if (__prefer2xImages)

??? {

??????? force1xScale = shouldForce1xScale;

??? }

???

??? NSString *imageExt = [imageFileName pathExtension];

??? if ([imageExt length] == 0)

??? {

??????? imageExt = @"png";

??? }

???

??? NSString *bundlePath = nil;

??? if (mainBundle != nil)

??? {

??????? bundlePath = [mainBundle bundlePath];

??? }

???

??? NSString *productSuffix = ProductSuffix();// ~iphone, ~ipad

??? NSString *imageNameWithoutSuffix = [imageFileName stringByReplacingOccurrencesOfString:productSuffix withString:@""];

???

??? // Default

??? NSString *imageNameWithoutSuffixAndExt = [imageNameWithoutSuffix stringByDeletingPathExtension];

??? // Default~iphone

??? NSString *imageNameWithSuffix = [imageNameWithoutSuffixAndExt stringByAppendingString:productSuffix];

??? // Default@1x

??? NSString *imageName1x = [imageNameWithoutSuffixAndExt stringByAppendingString:@"@1x"];

??? // Default@1x~iphone

??? NSString *imageName1xWithSuffix = [imageName1x stringByAppendingString:productSuffix];

??? // Default_1only_

??? NSString *imageName_1only_ = [imageNameWithoutSuffixAndExt stringByAppendingString:@"_1only_"];

??? // Default_1only_~ipnone

??? NSString *imageName_1only_WithSuffix = [imageName_1only_ stringByAppendingString:productSuffix];

???

??? // Default@2x

??? NSString *imageName2x = [imageNameWithoutSuffixAndExt stringByAppendingString:@"@2x"];

??? // Default@2x~iphone

??? NSString *imageName2xWithSuffix = [imageName2x stringByAppendingString:productSuffix];

??? // Default_2only_@2x

??? NSString *imageName_2only_2x = [imageNameWithoutSuffixAndExt stringByAppendingString:@"_2only_@2x"];

??? // Default_2only_@2x~iphone

??? NSString *imageName_2only_2xWithSuffix = [imageName_2only_2x stringByAppendingString:productSuffix];

???

??? NSString *targetFileName = nil;

??? NSString *targetFilePath = nil;

??? if (!force1xScale)

??? {

??????? // Default@2x~iphone.png

??????? targetFileName = [imageName2xWithSuffix stringByAppendingPathExtension:imageExt];

??????? targetFilePath = [bundlePath stringByAppendingPathComponent:targetFileName];

??????? resultImage = GetImageAtPath(targetFilePath, 2.0f);

???????

??????? // Default_2only_@2x~iphone.png

??????? if (resultImage == nil)

??????? {

??????????? targetFileName = [imageName_2only_2xWithSuffix stringByAppendingPathExtension:imageExt];

??????????? targetFilePath = [bundlePath stringByAppendingPathComponent:targetFileName];

??????????? resultImage = GetImageAtPath(targetFilePath, 2.0f);

??????? }

???????

??????? // Default@2x.png

??????? if (resultImage == nil)

??????? {

??????????? targetFileName = [imageName2x stringByAppendingPathExtension:imageExt];

??????????? targetFilePath = [bundlePath stringByAppendingPathComponent:targetFileName];

??????????? resultImage = GetImageAtPath(targetFilePath, 2.0f);

??????? }

???????

??????? // Default_2only_@2x.png

??????? if (resultImage == nil)

??????? {

??????????? targetFileName = [imageName_2only_2x stringByAppendingPathExtension:imageExt];

??????????? targetFilePath = [bundlePath stringByAppendingPathComponent:targetFileName];

??????????? resultImage = GetImageAtPath(targetFilePath, 2.0f);

??????? }

??? }

???

??? if (resultImage == nil)

??? {

??????? // Default~iphone.png

??????? targetFileName = [imageNameWithSuffix stringByAppendingPathExtension:imageExt];

??????? targetFilePath = [bundlePath stringByAppendingPathComponent:targetFileName];

??????? resultImage = GetImageAtPath(targetFilePath, 1.0f);

???????

??????? // Default.png

??????? if (resultImage == nil)

??????? {

??????????? targetFileName = [imageNameWithoutSuffixAndExt stringByAppendingPathExtension:imageExt];

??????????? targetFilePath = [bundlePath stringByAppendingPathComponent:targetFileName];

??????????? resultImage = GetImageAtPath(targetFilePath, 1.0f);

??????? }

???????

??????? // Default@1x~iphone.png

??????? if (resultImage == nil)

??????? {

??????????? targetFileName = [imageName1xWithSuffix stringByAppendingPathExtension:imageExt];

??????????? targetFilePath = [bundlePath stringByAppendingPathComponent:targetFileName];

??????????? resultImage = GetImageAtPath(targetFilePath, 1.0f);

??????? }

???????

??????? // Default_1only_~ipnone.png

??????? if (resultImage == nil)

??????? {

? ??????????targetFileName = [imageName_1only_WithSuffix stringByAppendingPathExtension:imageExt];

??????????? targetFilePath = [bundlePath stringByAppendingPathComponent:targetFileName];

??????????? resultImage = GetImageAtPath(targetFilePath, 1.0f);

??????? }

???????

??????? // Default@1x.png

??????? if (resultImage == nil)

??????? {

??????????? targetFileName = [imageName1x stringByAppendingPathExtension:imageExt];

??????????? targetFilePath = [bundlePath stringByAppendingPathComponent:targetFileName];

??????????? resultImage = GetImageAtPath(targetFilePath, 1.0f);

??????? }

???????

??????? // Default_1only.png

??????? if (resultImage == nil)

??????? {

??????????? targetFileName = [imageName_1only_ stringByAppendingPathExtension:imageExt];

??????????? targetFilePath = [bundlePath stringByAppendingPathComponent:targetFileName];

??????????? resultImage = GetImageAtPath(targetFilePath, 1.0f);

??????? }

???????

??????? // Default~iphone

??????? if (resultImage == nil)

??????? {

?????????? ?targetFilePath = [bundlePath stringByAppendingPathComponent:imageNameWithSuffix];

??????????? resultImage = GetImageAtPath(targetFilePath, 1.0f);

??????? }

???????

??????? // Default

??????? if (resultImage == nil)

??????? {

??????????? targetFilePath = [bundlePath stringByAppendingPathComponent:imageNameWithoutSuffixAndExt];

??????????? resultImage = GetImageAtPath(targetFilePath, 1.0f);

??????? }

??? }

???

??? if (resultImage == nil)

??? {

??????? if (!force1xScale)

??????? {

??????????? // Default@2x.png

??????????? targetFilePath = [mainBundle pathForResource:imageName2x ofType:imageExt];

??????????? resultImage = GetImageAtPath(targetFilePath, 2.0f);

???????????

??????????? // Default_2only_@2x.png

??????????? if (resultImage == nil)

??????????? {

??????????????? targetFilePath = [mainBundle pathForResource:imageName_2only_2x ofType:imageExt];

??????????????? resultImage = GetImageAtPath(targetFilePath, 2.0f);

??????????? }

??????? }

???????

??????? // Default.png

??????? if (resultImage == nil)

??????? {

??????????? targetFilePath = [mainBundle pathForResource:imageNameWithoutSuffixAndExt ofType:imageExt];

??????????? resultImage = GetImageAtPath(targetFilePath, 1.0f);

??????? }

???????

??????? // Default@1x.png

??????? if (resultImage == nil)

??????? {

??????????? targetFilePath = [mainBundle pathForResource:imageName1x ofType:imageExt];

??????????? resultImage = GetImageAtPath(targetFilePath, 1.0f);

??????? }

???????

??????? // Default_1only_.png

??????? if (resultImage == nil)

??????? {

??????????? targetFilePath = [mainBundle pathForResource:imageName_1only_ ofType:imageExt];

??????????? resultImage = GetImageAtPath(targetFilePath, 1.0f);

??????? }

??? }

???

??? if (resultImage != nil)

??? {

??????? [gCacheNameToImageMapsetValue:resultImage forKey:cacheNameOfImage];

??????? [gImageToCacheNameMapsetValue:cacheNameOfImage forKey:resultImage];

??????? [resultImage _setNamed:YES];

??????? [resultImage _setCached:YES];

??? }

???

??? return resultImage;

}

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轉(zhuǎn)載于:https://www.cnblogs.com/Proteas/p/3213487.html

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