如何以编程方式将图像切片为4、9、16和25片

Question

我需要一点帮助，用程序将一张图片切成4、9、16和25片。

我会感谢任何帮助或想法。谢谢

Answer 1

我为此做了一个简单的应用程序。您可以从这里下载：

https://github.com/bpolat/Image-Slicer

您需要的代码是：

-(NSMutableArray *)getImagesFromImage:(UIImage *)image withRow:(NSInteger)rows   withColumn:   (NSInteger)columns
 {
NSMutableArray *images = [NSMutableArray array];
CGSize imageSize = image.size;
CGFloat xPos = 0.0, yPos = 0.0;
CGFloat width = imageSize.width/rows;
CGFloat height = imageSize.height/columns;
for (int y = 0; y < columns; y++) {
    xPos = 0.0;
    for (int x = 0; x < rows; x++) {

        CGRect rect = CGRectMake(xPos, yPos, width, height);
        CGImageRef cImage = CGImageCreateWithImageInRect([image CGImage],  rect);

        UIImage *dImage = [[UIImage alloc] initWithCGImage:cImage];
        UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(x*width, y*height, width, height)];
        [imageView setImage:dImage];
        [imageView.layer setBorderColor:[[UIColor blackColor] CGColor]];
        [imageView.layer setBorderWidth:1.0];
        [self.view addSubview:imageView];
        [images addObject:dImage];
        xPos += width;
    }
    yPos += height;
}
return images;
  }

用法：

[self getImagesFromImage:[UIImage imageNamed:@"1.png"] withRow:4 withColumn:4];

结果：

​

​

Answer 2

以下是一个例子：

CGRect rect = CGRectMake(size.width / 4, size.height / 4 , 
(size.width / 2), (size.height / 2));
CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], rect);
UIImage *img = [UIImage imageWithCGImage:imageRef]; 
CGImageRelease(imageRef);

并查看以下链接：裁剪和调整图像 CGImage参考