把图片切成小片(IOS)

by 伍雪颖
[img]http://img.blog.csdn.net/20150105144037288?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvcmFpbmxlc3Zpbw==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
#import <Foundation/Foundation.h>
#import <AppKit/AppKit.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        if (argc < 2) {
            return 0;
        }
        NSString *inputFile = [NSString stringWithCString:argv[1] encoding:NSUTF8StringEncoding];
        CGFloat titleSize = 256;
        NSString *outputPath = [inputFile stringByDeletingPathExtension];
       
        NSImage *image = [[NSImage alloc] initWithContentsOfFile:inputFile];
        NSSize size = [image size];
        NSArray *representations = [image representations];
        if ([representations count]) {
            NSBitmapImageRep *representation = representations[0];
            size.width = [representation pixelsWide];
            size.height = [representation pixelsHigh];
        }
        NSRect rect = NSMakeRect(0, 0, size.width, size.height);
        CGImageRef imageRef = [image CGImageForProposedRect:&rect context:NULL hints:nil];
       
        NSInteger rows = ceil(size.height/titleSize);
        NSInteger cols = ceil(size.width/titleSize);
       
        for (int y =0;y<rows;++y) {
            for (int x=0;x<cols;++x) {
                CGRect titleRect = CGRectMake(x*titleSize, y*titleSize, titleSize, titleSize);
                CGImageRef titleImage = CGImageCreateWithImageInRect(imageRef, titleRect);
               
                NSBitmapImageRep *imageRep = [[NSBitmapImageRep alloc] initWithCGImage:titleImage];
                NSData *data = http://www.sjsjw.com/100/000173MYM027461/[imageRep representationUsingType:NSJPEGFileType properties:nil];
                CGImageRelease(titleImage);
               
                NSString *path = [outputPath stringByAppendingFormat:@"_%02i_%02i.jpg",x,y];
                [data writeToFile:path atomically:NO];
            }
        }
    }
    return 0;
}
终端运行:
./CutImageAPP 1.jpg