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Objective-C??BMP????180?

BMP??????

BMP??????????????????????????????????????????????

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????????Objective-C?????BMP???????180??

#import 
   
    @interface BMPHelper : NSObject+ (UIImage *)rotateBMP:(NSData *)bmpData;@end
   

#import "BMPHelper.h"@implementation BMPHelper+ (UIImage *)rotateBMP:(NSData *)bmpData {    // 1. ??BMP??    NSBitmapImageData *bitmapData = [NSBitmapImageData dataWithData:bmpData];    // 2. ??????BMP????    void *bitmapBuffer = malloc(bitmapData.bytesPerRow * bitmapData.height);    // 3. ??????BMP??    NSImage *rotatedImage = [[NSImage alloc] initWithData:bitmapData];    // 4. ??????    for (int y = 0; y < bitmapData.height; y++) {        for (int x = 0; x < bitmapData.width; x++) {            // ??180???????(x, y)??(x, height - y - 1)            // ????????????            // ??????????BMP???????        }    }    free(bitmapBuffer);    return [rotatedImage rotatedImage];}@end

?????????????BMP????????????????????BMP?????????????????

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?????????????????BMP??????????rotateBMP????????????????????

NSData *bmpData = [NSData dataWithContentsOfFile:@"yourBMPFile.bmp"];UIImage *rotatedImage = [BMPHelper rotateBMP:bmpData];[rotatedImage setImage:UIImageView * imageView];

??????????????BMP??????????BMPHelper????????????????????UI????

BMP?????????

BMP?????????????

???BMP?????????????????????????????????????????????

????????BMP????????????????????????

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????????????????BMP????????????????????????

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