iOS简单的无损失分割图片，比如生成9宫格

⚠️ 如果分割的图片大小不对，可能需要考虑缩放。
请看这里

#pragma mark -分割图片
- (UIImage *)captureOriginalImage:(UIImage *)oImage frame:(CGRect)fra {
    CGImageRef ref = CGImageCreateWithImageInRect(oImage.CGImage, fra);
    UIImage *i = [UIImage imageWithCGImage:ref];
    CGImageRelease(ref);
    return i;
}

- (NSMutableArray <UIImage *>*)captureImageArrWithRow:(NSInteger)row Col:(NSInteger)col FromOriginalImage:(UIImage *)oImage{
    
    CGFloat iW = oImage.size.width;
    CGFloat iH = oImage.size.height;
    
    CGFloat gW = iW / col;
    CGFloat gH = iH / row;
    
    NSMutableArray <UIImage *>*imageArr = [[NSMutableArray alloc]init];
    for (int i = 0; i < row; i++) {
        for (int j = 0; j < col; j++) {
            UIImage *theImage = [self captureOriginalImage:oImage frame:CGRectMake(j*iW/col, i*iH/row, gW, gH)];
            [imageArr addObject:theImage];
        }
    }

    return imageArr;
}

效果图：