iphone - 如何将一张图像分割成多个部分？

Question

任何人都可以向我解释如何在 iPhone 操作系统中将图像(均等和不等)分割成多个部分吗？如果您提供示例代码，这对我很有帮助。

Answer 1

我改编了一些从 Bill Dudney 中得到的代码的Core Animation Book完成此任务:

- (NSArray*)splitImageIntoRects:(CGImageRef)anImage{

    CGSize imageSize = CGSizeMake(CGImageGetWidth(anImage), CGImageGetHeight(anImage));

    NSMutableArray *splitLayers = [NSMutableArray array];

            kXSlices = 3;
            kYSlices = 3;        

    for(int x = 0;x < kXSlices;x++) {
        for(int y = 0;y < kYSlices;y++) {
            CGRect frame = CGRectMake((imageSize.width / kXSlices) * x,
                                     (imageSize.height / kYSlices) * y,
                                     (imageSize.width / kXSlices),
                                     (imageSize.height / kYSlices));

            CALayer *layer = [CALayer layer];
            layer.frame = frame;                                                    
            CGImageRef subimage = CGImageCreateWithImageInRect(drawnImage, frame);
            layer.contents = (id)subimage;
            CFRelease(subimage);
            [splitLayers addObject:layer];
        }
    }
    return splitLayers; 
}

注意:要获取 CGImageRef:

CGImageRef anImage = [myUIImage CGImage];