固定/自定义图片 取色

固定图片取色

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    //触点对象
    UITouch *touch=touches.anyObject;
    //触点位置
    CGPoint touchLocation=[touch locationInView:self.colorImage];
//    self.pointImg.frame = CGRectMake(self.colorImage.frame.origin.x + touchLocation.x,self.colorImage.frame.origin.y + touchLocation.y, 5, 5);
    self.pointImg.center = CGPointMake(self.colorImage.frame.origin.x + touchLocation.x, self.colorImage.frame.origin.y + touchLocation.y);
    NSLog(@"%f %f",touchLocation.x,touchLocation.y);
    //触点颜色
    UIColor *positionColor=[self getPixelColorAtLocation:touchLocation];
    NSLog(@"====%@",positionColor);
    self.colorView.backgroundColor = positionColor;
}

- (UIColor*) getPixelColorAtLocation:(CGPoint)point
{
    UIColor* color = [UIColor whiteColor];
    if (point.x < self.colorImage.frame.size.width && point.x > 0 && point.y < self.colorImage.frame.size.height && point.y > 0) {
        UIImageView *colorImageView=self.colorImage;
        CGImageRef inImage = colorImageView.image.CGImage;
        // Create off screen bitmap context to draw the image into. Format ARGB is 4 bytes for each pixel: Alpa, Red, Green, Blue
        CGContextRef cgctx = [self createARGBBitmapContextFromImage:inImage];
        if (cgctx == NULL)
        {
            return nil;
        }
        size_t w = CGImageGetWidth(inImage);
        size_t h = CGImageGetHeight(inImage);
        CGRect rect = {{0,0},{w,h}};
        
        // Draw the image to the bitmap context. Once we draw, the memory
        // allocated for the context for rendering will then contain the
        // raw image data in the specified color space.
        CGContextDrawImage(cgctx, rect, inImage);
        
        // Now we can get a pointer to the image data associated with the bitmap
        // context.
        unsigned char* data = CGBitmapContextGetData (cgctx);
        if (data != NULL)
        {
            //offset locates the pixel in the data from x,y.
            //4 for 4 bytes of data per pixel, w is width of one row of data.
            @try
            {
                
//                int offset = 4*((w*round(point.y * self.scale))+round(point.x * self.scale));
                int offset = 4*((w*round(point.y ))+round(point.x));
                //NSLog(@"offset: %d", offset);
                int alpha =  data[offset];
                int red = data[offset+1];
                int green = data[offset+2];
                int blue = data[offset+3];
                            NSLog(@"offset: %i colors: RGB A %i %i %i  %i",offset,red,green,blue,alpha);
                color = [UIColor colorWithRed:(red/255.0f) green:(green/255.0f) blue:(blue/255.0f) alpha:(alpha/255.0f)];
            }
            @catch (NSException * e)
            {
                NSLog(@"%@",[e reason]);
            }
            @finally
            {
                
            }
            
        }
        
        // When finished, release the context
        CGContextRelease(cgctx);
        // Free image data memory for the context
        if (data)
        {
            free(data);
        }
        
    }
    
    return color;
}

- (CGContextRef) createARGBBitmapContextFromImage:(CGImageRef) inImage
{
    
    CGContextRef    context = NULL;
    CGColorSpaceRef colorSpace;
    void *          bitmapData;
    int            bitmapByteCount;
    int            bitmapBytesPerRow;
    
    // Get image width, height. We'll use the entire image.
    size_t pixelsWide = CGImageGetWidth(inImage);
    size_t pixelsHigh = CGImageGetHeight(inImage);
    
    // Declare the number of bytes per row. Each pixel in the bitmap in this
    // example is represented by 4 bytes; 8 bits each of red, green, blue, and
    // alpha.
    bitmapBytesPerRow   = (int)(pixelsWide * 4);
    bitmapByteCount     =(int)(bitmapBytesPerRow * pixelsHigh);
    
    // Use the generic RGB color space.
    colorSpace = CGColorSpaceCreateDeviceRGB();
    
    if (colorSpace == NULL)
    {
        fprintf(stderr, "Error allocating color space\n");
        return NULL;
    }
    
    // Allocate memory for image data. This is the destination in memory
    // where any drawing to the bitmap context will be rendered.
    bitmapData = malloc( bitmapByteCount );
    if (bitmapData == NULL)
    {
        fprintf (stderr, "Memory not allocated!");
        CGColorSpaceRelease( colorSpace );
        return NULL;
    }
    
    // Create the bitmap context. We want pre-multiplied ARGB, 8-bits
    // per component. Regardless of what the source image format is
    // (CMYK, Grayscale, and so on) it will be converted over to the format
    // specified here by CGBitmapContextCreate.
    context = CGBitmapContextCreate (bitmapData,
                                     pixelsWide,
                                     pixelsHigh,
                                     8,      // bits per component
                                     bitmapBytesPerRow,
                                     colorSpace,
                                     kCGImageAlphaPremultipliedFirst);
    if (context == NULL)
    {
        free (bitmapData);
        fprintf (stderr, "Context not created!");
    }
    
    // Make sure and release colorspace before returning
    CGColorSpaceRelease( colorSpace );
    
    return context;
    
}

自定义图片取色

@interface ViewController ()<UIImagePickerControllerDelegate,UINavigationControllerDelegate>
@property(nonatomic,strong)UIImageView *imageView;
@property(nonatomic,strong)UIImageView *backgroundImageV;
@property (weak, nonatomic) IBOutlet UIView *colorView;
@property(nonatomic,assign)CGFloat scale;
@property(nonatomic,strong)UIView *viewCircle;
@property (nonatomic,assign)NSInteger openType;
@property (nonatomic,strong)UIPopoverController *imagePickerPopover;
@end
@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a
}

- (IBAction)getImageAction:(id)sender {
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    [self.navigationController presentViewController:picker animated:YES completion:nil];
    picker.delegate = self;
}
//计算imageView的frame
-(CGRect)getImageByScaleFromImage:(UIImage *)image
{
    CGFloat widthScale = image.size.width / SCREEN_WIDTH;
    CGFloat heightScale = image.size.height / SCREEN_HEIGHT;
    self.scale = MAX(widthScale, heightScale);
    return CGRectMake(0, (SCREEN_HEIGHT - (image.size.height - 64) / self.scale) / 2.0, image.size.width / self.scale, image.size.height / self.scale);
}
//修正图片的旋转方向
- (UIImage *)fixOrientation:(UIImage *)aImage {
    
    if (aImage.imageOrientation == UIImageOrientationUp)
        return aImage;
    CGAffineTransform transform = CGAffineTransformIdentity;
    switch (aImage.imageOrientation) {
        case UIImageOrientationDown:
        case UIImageOrientationDownMirrored:
            transform = CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height);
            transform = CGAffineTransformRotate(transform, M_PI);
            break;
            
        case UIImageOrientationLeft:
        case UIImageOrientationLeftMirrored:
            transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);
            transform = CGAffineTransformRotate(transform, M_PI_2);
            break;
            
        case UIImageOrientationRight:
        case UIImageOrientationRightMirrored:
            transform = CGAffineTransformTranslate(transform, 0, aImage.size.height);
            transform = CGAffineTransformRotate(transform, -M_PI_2);
            break;
        default:
            break;
    }
    switch (aImage.imageOrientation) {
        case UIImageOrientationUpMirrored:
        case UIImageOrientationDownMirrored:
            transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);
            transform = CGAffineTransformScale(transform, -1, 1);
            break;           
        case UIImageOrientationLeftMirrored:
        case UIImageOrientationRightMirrored:
            transform = CGAffineTransformTranslate(transform, aImage.size.height, 0);
            transform = CGAffineTransformScale(transform, -1, 1);
            break;
        default:
            break;
    }
    
    // Now we draw the underlying CGImage into a new context, applying the transform
    // calculated above.
    CGContextRef ctx = CGBitmapContextCreate(NULL, aImage.size.width, aImage.size.height,
                                             CGImageGetBitsPerComponent(aImage.CGImage), 0,
                                             CGImageGetColorSpace(aImage.CGImage),
                                             CGImageGetBitmapInfo(aImage.CGImage));
    CGContextConcatCTM(ctx, transform);
    switch (aImage.imageOrientation) {
        case UIImageOrientationLeft:
        case UIImageOrientationLeftMirrored:
        case UIImageOrientationRight:
        case UIImageOrientationRightMirrored:
            // Grr...
            CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.height,aImage.size.width), aImage.CGImage);
            break;
            
        default:
            CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.width,aImage.size.height), aImage.CGImage);
            break;
    }
    
    // And now we just create a new UIImage from the drawing context
    CGImageRef cgimg = CGBitmapContextCreateImage(ctx);
    UIImage *img = [UIImage imageWithCGImage:cgimg];
    CGContextRelease(ctx);
    CGImageRelease(cgimg);
    return img;
}
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    
    UIImage *firstImage = [info valueForKey:UIImagePickerControllerOriginalImage];
    UIImage *image = [self fixOrientation:firstImage];
    NSLog(@"123  %f %f",image.size.width,image.size.height);
    
    //将照片放入UIImageView对象中；
    self.imageView=[[UIImageView alloc]init];
    
    self.imageView.frame=[self getImageByScaleFromImage:image];
    self.imageView.image = image;
    self.backgroundImageV = [[UIImageView alloc]initWithFrame:CGRectMake(0, self.imageView.frame.origin.y, image.size.width, image.size.height)];
    self.backgroundImageV.image = image;
    UIView *coverView = [[UIView alloc]initWithFrame:self.backgroundImageV.frame];
    coverView.backgroundColor = [UIColor whiteColor];
    [self.view addSubview:self.backgroundImageV];
    [self.view addSubview:coverView];
    [self.view addSubview:self.imageView];
    // self.imageView=imageView;
    
    UIView *viewCircle=[[UIView alloc]init];
    viewCircle.backgroundColor=[UIColor clearColor];
    viewCircle.layer.borderColor=[[UIColor blackColor]CGColor];
    viewCircle.layer.borderWidth=1.5;
    viewCircle.frame=CGRectMake(0,64, 25, 25);
    [viewCircle.layer setCornerRadius:CGRectGetHeight([viewCircle bounds]) / 2];
    viewCircle.layer.masksToBounds=YES;
    self.viewCircle=viewCircle;
    [self.imageView addSubview:self.viewCircle];
    
    if (self.openType == UIImagePickerControllerSourceTypeCamera) {
        
        //将图片保存到图库
        UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);
        
    }else if(self.openType == UIImagePickerControllerSourceTypePhotoLibrary){
        
        //本身是从图库打开的，就不用保存到图库了；
        
    }
    
    //判断UIPopoverController对象是否存在
    if (self.imagePickerPopover) {
        [self.imagePickerPopover dismissPopoverAnimated:YES];
        self.imagePickerPopover = nil;
    }
    else
    {
        //关闭以模态形式显示的UIImagePickerController
        [self dismissViewControllerAnimated:YES completion:nil];
    }
    
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    //触点对象
    UITouch *touch=touches.anyObject;
    //触点位置
    CGPoint touchLocation=[touch locationInView:self.imageView];
    NSLog(@"%f %f",touchLocation.x,touchLocation.y);
    //触点颜色
    UIColor *positionColor=[self getPixelColorAtLocation:touchLocation];
    NSLog(@"====%@",positionColor);
    self.colorView.backgroundColor = positionColor;
}
//
- (UIColor*) getPixelColorAtLocation:(CGPoint)point
{
    UIColor* color = [UIColor whiteColor];
    if (point.x < self.imageView.frame.size.width && point.x > 0 && point.y < self.imageView.frame.size.height && point.y > 0) {
        UIImageView *colorImageView=self.backgroundImageV;
        CGImageRef inImage = colorImageView.image.CGImage;
        // Create off screen bitmap context to draw the image into. Format ARGB is 4 bytes for each pixel: Alpa, Red, Green, Blue
        CGContextRef cgctx = [self createARGBBitmapContextFromImage:inImage];
        if (cgctx == NULL)
        {
            return nil;
        }
        size_t w = CGImageGetWidth(inImage);
        size_t h = CGImageGetHeight(inImage);
        CGRect rect = {{0,0},{w,h}};
        
        // Draw the image to the bitmap context. Once we draw, the memory
        // allocated for the context for rendering will then contain the
        // raw image data in the specified color space.
        CGContextDrawImage(cgctx, rect, inImage);
        
        // Now we can get a pointer to the image data associated with the bitmap
        // context.
        unsigned char* data = CGBitmapContextGetData (cgctx);
        if (data != NULL)
        {
            //offset locates the pixel in the data from x,y.
            //4 for 4 bytes of data per pixel, w is width of one row of data.
            @try
            {
                int offset = 4*((w*round(point.y * self.scale))+round(point.x * self.scale));
                //NSLog(@"offset: %d", offset);
                int alpha =  data[offset];
                int red = data[offset+1];
                int green = data[offset+2];
                int blue = data[offset+3];
                //            NSLog(@"offset: %i colors: RGB A %i %i %i  %i",offset,red,green,blue,alpha);
                color = [UIColor colorWithRed:(red/255.0f) green:(green/255.0f) blue:(blue/255.0f) alpha:(alpha/255.0f)];
            }
            @catch (NSException * e)
            {
                NSLog(@"%@",[e reason]);
            }
            @finally
            {
                
            }
            
        }
        
        // When finished, release the context
        CGContextRelease(cgctx);
        // Free image data memory for the context
        if (data)
        {
            free(data);
        }
        
    }
    
    return color;
}

- (CGContextRef) createARGBBitmapContextFromImage:(CGImageRef) inImage
{
    
    CGContextRef    context = NULL;
    CGColorSpaceRef colorSpace;
    void *          bitmapData;
    int            bitmapByteCount;
    int            bitmapBytesPerRow;
    
    // Get image width, height. We'll use the entire image.
    size_t pixelsWide = CGImageGetWidth(inImage);
    size_t pixelsHigh = CGImageGetHeight(inImage);
    
    // Declare the number of bytes per row. Each pixel in the bitmap in this
    // example is represented by 4 bytes; 8 bits each of red, green, blue, and
    // alpha.
    bitmapBytesPerRow   = (int)(pixelsWide * 4);
    bitmapByteCount     =(int)(bitmapBytesPerRow * pixelsHigh);
    
    // Use the generic RGB color space.
    colorSpace = CGColorSpaceCreateDeviceRGB();
    
    if (colorSpace == NULL)
    {
        fprintf(stderr, "Error allocating color space\n");
        return NULL;
    }
    
    // Allocate memory for image data. This is the destination in memory
    // where any drawing to the bitmap context will be rendered.
    bitmapData = malloc( bitmapByteCount );
    if (bitmapData == NULL)
    {
        fprintf (stderr, "Memory not allocated!");
        CGColorSpaceRelease( colorSpace );
        return NULL;
    }
    
    // Create the bitmap context. We want pre-multiplied ARGB, 8-bits
    // per component. Regardless of what the source image format is
    // (CMYK, Grayscale, and so on) it will be converted over to the format
    // specified here by CGBitmapContextCreate.
    context = CGBitmapContextCreate (bitmapData,
                                     pixelsWide,
                                     pixelsHigh,
                                     8,      // bits per component
                                     bitmapBytesPerRow,
                                     colorSpace,
                                     kCGImageAlphaPremultipliedFirst);
    if (context == NULL)
    {
        free (bitmapData);
        fprintf (stderr, "Context not created!");
    }  
    // Make sure and release colorspace before returning
    CGColorSpaceRelease( colorSpace );
  return context;   
}