grid crop with uiimage

이미지를 grid 형태로 잘라서 view에 add하는 예제.

- (void)viewDidLoad

{

    [super viewDidLoad];

    UIImage *scaledImage = [self scaleWithImage:[UIImage imageNamed:@"37.jpg"] scaledToSize:self.view.frame.size];

    self.originalImageView = [[UIImageView alloc] initWithImage:scaledImage];

    [self prepareSlices:10 :10];

}

-(void)prepareSlices:(uint)row :(uint)col

{

    float flagX = _originalImageView.image.size.width / _originalImageView.frame.size.width;

    float flagY = _originalImageView.image.size.height / _originalImageView.frame.size.height;

    

    float _width    = _originalImageView.frame.size.width / col;

    float _height   = _originalImageView.frame.size.height / row;

    

    float _posX = 0.0;

    float _posY = 0.0;

    

    for (int i = 1; i <= row * col; i++) {

        

        UIImageView *croppedImageVeiw = [[UIImageView alloc] initWithFrame:CGRectMake(_posX, _posY, _width, _height)];

        UIImage *img = [self getCropImage:CGRectMake(_posX * flagX,_posY * flagY, _width * flagX, _height * flagY)];

        croppedImageVeiw.image = img;

        

        croppedImageVeiw.layer.borderColor = [[UIColor whiteColor] CGColor];

        croppedImageVeiw.layer.borderWidth = 1.0f;

        

        [self.view addSubview:croppedImageVeiw];

        

        _posX += _width;

        

        if (i % col == 0) {

            _posX = 0;

            _posY += _height;

        }

    }

}

-(UIImage*)getCropImage:(CGRect)cropRect

{

    CGImageRef image = CGImageCreateWithImageInRect([_originalImageView.image CGImage],cropRect);

    UIImage *cropedImage = [UIImage imageWithCGImage:image];

    CGImageRelease(image);

    return cropedImage;

}

- (UIImage *)scaleWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {

    //UIGraphicsBeginImageContext(newSize);

    // In next line, pass 0.0 to use the current device's pixel scaling factor (and thus account for Retina resolution).

    // Pass 1.0 to force exact pixel size.

    UIGraphicsBeginImageContextWithOptions(newSize, NO, 1.0);

    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];

    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return newImage;

}