群组头像拼接

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利用画板实现群组头像图片拼接

附参考：StitchingImage
该库也可实现群组头像，是通过添加多个UIImageVIew拼接，返回的是一个UIImageView,感觉不是很方便，于是博主就照葫芦画瓢实现一个返回是UIImage的拼接头像
不多说，上代码：
//配合SDWebImage根据图片URL获取图片(有缓存则获取缓存的图片，没有则网络链接获取)+ (UIImage *)imageWithUrlString:(NSString *)imageUrl{    UIImageView * imageView = [[UIImageView alloc] init];    NSURL * url = [NSURL URLWithString:imageUrl];    [imageView sd_setImageWithURL:url placeholderImage:nil];    SDWebImageManager *manager = [SDWebImageManager sharedManager];    BOOL existBool = [manager diskImageExistsForURL:url];//判断是否有缓存    UIImage * image;    if (existBool) {        image = [[manager imageCache] imageFromDiskCacheForKey:url.absoluteString];    }else{        NSData *data = [NSData dataWithContentsOfURL:url];        image = [UIImage imageWithData:data];    }    return image;}//传入图片数组即可（如果是读取链接图片可配合SDWebImage使用上面的方法获取图片再添加入数组）//拼接完成返回一张图片+ (UIImage *) combine:(NSArray<UIImage *> *)images{    CGSize offScreenSize = CGSizeMake(200, 200);    UIGraphicsBeginImageContext(offScreenSize);    CGContextRef context = UIGraphicsGetCurrentContext();    CGContextSetFillColorWithColor(context, [[UIColor lightGrayColor] CGColor]);//图片背景色    CGContextFillRect(context, CGRectMake(0, 0, 200, 200));    //确定拼接图片的宽度    CGFloat imageWidth = [self generateImageWidthWithImageCount:images.count];    switch (images.count) {        case 2:        {            CGFloat row_1_origin_y = (200 - imageWidth) / 2;            [self generatorMatrix:images beginOriginY:row_1_origin_y];        }            break;        case 3:        {            CGFloat row_1_origin_y = (200 - imageWidth * 2) / 3;            UIImage* image_1 = images[0];            CGRect rect_1 = CGRectMake((200 - imageWidth) / 2, row_1_origin_y, imageWidth, imageWidth);            [image_1 drawInRect:rect_1];            [self generatorMatrix:images beginOriginY:row_1_origin_y + imageWidth + 10];        }            break;        case 4:        {            CGFloat row_1_origin_y = (200 - imageWidth * 2) / 3;            [self generatorMatrix:images beginOriginY:row_1_origin_y];        }            break;        case 5:        {            CGFloat row_1_origin_y = (200 - imageWidth * 2 - 10) / 2;            UIImage* image_1 = images[0];            CGRect rect_1 = CGRectMake((200 - 2 * imageWidth - 10) / 2, row_1_origin_y, imageWidth, imageWidth);            [image_1 drawInRect:rect_1];            UIImage* image_2 = images[1];            CGRect rect_2 = CGRectMake(rect_1.origin.x + imageWidth + 10, row_1_origin_y, imageWidth, imageWidth);            [image_2 drawInRect:rect_2];            [self generatorMatrix:images beginOriginY:row_1_origin_y + imageWidth + 10];        }            break;        case 6:        {            CGFloat row_1_origin_y = (200 - imageWidth * 2 - 10) / 2;            [self generatorMatrix:images beginOriginY:row_1_origin_y];        }            break;        case 7:        {            CGFloat row_1_origin_y = (200 - imageWidth * 3) / 4;            UIImage* image_1 = images[0];            CGRect rect_1 = CGRectMake((200 - imageWidth) / 2, row_1_origin_y, imageWidth, imageWidth);            [image_1 drawInRect:rect_1];            [self generatorMatrix:images beginOriginY:row_1_origin_y + imageWidth + 10];        }            break;        case 8:        {            CGFloat row_1_origin_y = (200 - imageWidth * 3) / 4;            UIImage* image_1 = images[0];            CGRect rect_1 = CGRectMake((200 - 2 * imageWidth - 10) / 2, row_1_origin_y, imageWidth, imageWidth);            [image_1 drawInRect:rect_1];            UIImage* image_2 = images[1];            CGRect rect_2 = CGRectMake(rect_1.origin.x + imageWidth + 10, row_1_origin_y, imageWidth, imageWidth);            [image_2 drawInRect:rect_2];            [self generatorMatrix:images beginOriginY:row_1_origin_y + imageWidth + 10];        }            break;        case 9:        {            CGFloat row_1_origin_y = (200 - imageWidth * 3) / 4;            [self generatorMatrix:images beginOriginY:row_1_origin_y];        }            break;        default:            break;    }    UIImage* imagez = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return imagez;}+ (void)generatorMatrix:(NSArray *)images beginOriginY:(CGFloat)beginOriginY {    int count = (int)images.count;    int cellCount;    int maxRow;    int maxColumn;    int ignoreCountOfBegining;    if (count <= 4)    {        maxRow = 2;        maxColumn = 2;        ignoreCountOfBegining = count % 2;        cellCount = 4;    }    else    {        maxRow = 3;        maxColumn = 3;        ignoreCountOfBegining = count % 3;        cellCount = 9;    }    CGFloat imageWidth = [self generateImageWidthWithImageCount:images.count];    for (int i = 0; i < cellCount; i++) {        if (i > images.count - 1) break;        if (i < ignoreCountOfBegining) continue;        int row = floor((float)(i - ignoreCountOfBegining) / maxRow);        int column = (i - ignoreCountOfBegining) % maxColumn;        CGFloat origin_x = 10 + imageWidth * column + 10 * column;        CGFloat origin_y = beginOriginY + imageWidth * row + 10 * row;        CGRect rect = CGRectZero;        rect = CGRectMake(origin_x, origin_y, imageWidth, imageWidth);        [images[i] drawInRect:rect];    }}+ (CGFloat)generateImageWidthWithImageCount:(NSInteger)count {    CGFloat sideLength = 0.0f;    if (count >=2 && count <=4) {        sideLength = (200 - 10 * 3) / 2;    } else {        sideLength = (200 - 10 * 4) / 3;    }    return sideLength;}
效果如下图：
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