Question

我正在开发简单的图像处理应用，这是我更改class ExampleClass(){ fun example(){ println("I am in the class.") } } object ExampleObject{ fun example(){ println("I am in the object.") } } fun main(args: Array<String>){ val exampleClass = ExampleClass() // A class needs to be instantiated. exampleClass.example() // Running the instance of the object. ExampleObject.example() // An object can be thought of as a Singleton and doesn't need any instantiation. }亮度的失败尝试：

NSImage

这是- (IBAction)brightnessSlider:(NSSlider*)sender { ViewController *controller = (ViewController*)[NSApplication sharedApplication].keyWindow.contentViewController; controller.imageView.image = originalImage; CIImage* const beginImage = [self fromNSImageToCIImage:originalImage]; filter = [CIFilter filterWithName:@"CIColorControls" keysAndValues: kCIInputImageKey, beginImage, kCIInputBrightnessKey, [sender doubleValue], nil]; self->filteredImage = self->filter.outputImage; controller.imageView.image = [self fromCIImageToNSImage:filteredImage]; }和fromNSImageToCIImage的实现：

fromCIImageToNSImage

这是正确的方法吗？我什至不知道什么是行不通的。谢谢。

已编辑（我重写了代码，发件人的值有问题）：

- (NSImage *)fromCIImageToNSImage:(CIImage *)inputImage {
    struct CGImage *cg = [context createCGImage:inputImage fromRect:[inputImage extent]];
    NSImage *finalImage = [[NSImage alloc] initWithCGImage:cg size:NSZeroSize];
    return finalImage;
}

- (CIImage *)fromNSImageToCIImage:(NSImage *)inputImage {
    struct CGImage *cg = [inputImage CGImageForProposedRect: nil context: nil hints: nil];
    CIImage *temp = [[CIImage alloc] initWithCGImage: cg options: nil];
    return temp;
}

使用NSSlider时崩溃-在此行：- (IBAction)brightnessSlider:(NSSlider*)sender { ViewController *controller = (ViewController*)[NSApplication sharedApplication].keyWindow.contentViewController; CIImage* const beginImage = [self fromNSImageToCIImage:controller.imageView.image]; CIFilter *brightness = [CIFilter filterWithName:@"CIColorControls" keysAndValues: kCIInputImageKey, beginImage, @"inputBrightness", [sender doubleValue], nil]; CIImage *outputImage = brightness.outputImage; struct CGImage* cgimg = [context createCGImage:outputImage fromRect:[outputImage extent]]; NSImage *newImage = [[NSImage alloc] initWithCGImage:cgimg size:NSZeroSize]; controller.imageView.image = newImage; }

并且调试器显示：线程1：EXC_BAD_ACCESS（代码= 1，地址= 0x6fbbba08）

Answer 1

更改错误行：CIFilter *brightness = [CIFilter filterWithName:@"CIColorControls" keysAndValues: kCIInputImageKey, beginImage, @"inputBrightness", [NSNumber numberWithFloat:[sender floatValue]], nil];完成了工作。

使用NSSlider更改NSImage亮度

1 个答案: