Question

我真的坚持用一定的色调着色UIImage。 UIImage位于自定义TableView单元格中（如果这有任何区别）。

enter image description here

查看图片，UIImage已被0.5不透明度黄色取代，原始图像已被丢弃。我想要对现有图像着色，而不是完全覆盖图像。（p.s：图片中的数字是图像顶部的标签，它们是无关的）。

我意识到stackoverflow上有类似的线程，我必须尝试所有的代码:-)没有什么工作。我不希望任何人发布任何代码，只是推动正确的方向！

以下代码说明：

myImage是图片
颜色是颜色，可能是黄色，不透明度为0.5
我将[util tintedImageWithColor]与 myImage 和 color 一起使用。
如上图所示。

有没有人有想法，推动正确的方向？

更新

MasterViewController.m

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    ArticleCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
    Article *article = self.articles[indexPath.row];
    Utils *util = [[Utils alloc] init];

    // Populate cell components
    UIImage *myImage = [UIImage imageWithData:article.post_image_thumbnail_data];

    // Set image tint
    UIColor *color = [UIColor colorWithRed:(160/15.0) green:(97/15.0) blue:(5/55.0) alpha:0.5];
     myImage = [util tintedImageWithColor:(UIImage *) myImage:(UIColor *) color blendingMode:kCGBlendModeDestinationIn highQuality:YES];

    cell.imageView.image = myImage;

    return cell;
}

Utils.m

- (UIImage *)tintedImageWithColor:(UIImage*)image : (UIColor *)tintColor blendingMode:(CGBlendMode)blendMode highQuality:(BOOL) yerOrNo;
{
    CGSize size = CGSizeMake(70, 70);
    UIGraphicsBeginImageContextWithOptions(size, NO, 0.0f);
    if (yerOrNo) {
        CGContextRef context = UIGraphicsGetCurrentContext();
        CGContextSetShouldAntialias(context, true);
        CGContextSetAllowsAntialiasing(context, true);
        CGContextSetInterpolationQuality(context, kCGInterpolationHigh);
    }
    [tintColor setFill];
    CGRect bounds = CGRectMake(0, 0, size.width, size.height);
    UIRectFill(bounds);

    [image drawInRect:bounds blendMode:blendMode alpha:1.0f];

    if (blendMode != kCGBlendModeDestinationIn)
        [image drawInRect:bounds blendMode:kCGBlendModeDestinationIn alpha:0.4];

    UIImage *tintedImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return tintedImage;
}

Utils.h

- (UIImage *)tintedImageWithColor:(UIImage*)image : (UIColor *)tintColor blendingMode:(CGBlendMode)blendMode highQuality:(BOOL) yerOrNo;

Answer 1

我在我的一个项目中发现了这段代码，我不知道确切的来源，但它应该有效，使用kCGBlendModeDestinationIn：

- (UIImage *)tintedImageWithColor:(UIColor *)tintColor blendingMode:(CGBlendMode)blendMode highQuality:(BOOL) yerOrNo;
{
    UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0f);
    if (yerOrNo) {
        CGContextRef context = UIGraphicsGetCurrentContext();
        CGContextSetShouldAntialias(context, true);
        CGContextSetAllowsAntialiasing(context, true);
        CGContextSetInterpolationQuality(context, kCGInterpolationHigh);
    }
    [tintColor setFill];
    CGRect bounds = CGRectMake(0, 0, self.size.width, self.size.height);
    UIRectFill(bounds);
    [self drawInRect:bounds blendMode:blendMode alpha:1.0f];

    if (blendMode != kCGBlendModeDestinationIn)
        [self drawInRect:bounds blendMode:kCGBlendModeDestinationIn alpha:1.0];

    UIImage *tintedImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return tintedImage;
}

着色UIImage的颜色

1 个答案: