cocoa - 以编程方式更改 Mac 显示屏亮度

Question

如何从 cocoa 应用程序更改 Mac 显示屏亮度？

Answer 1

CGDisplayIOServicePort 是 deprecated in OS 10.9 – 因此您必须使用IOServiceGetMatchingServices来获取IODisplaySetFloatParameter的服务参数。这是一个基本函数，用于查找名为“display”的服务并更改其亮度。

- (void) setBrightnessTo: (float) level
{

    io_iterator_t iterator;
    kern_return_t result = IOServiceGetMatchingServices(kIOMasterPortDefault,
                                                        IOServiceMatching("IODisplayConnect"),
                                                        &iterator);

    // If we were successful
    if (result == kIOReturnSuccess)
    {
        io_object_t service;
        while ((service = IOIteratorNext(iterator))) {
            IODisplaySetFloatParameter(service, kNilOptions, CFSTR(kIODisplayBrightnessKey), level);

            // Let the object go
            IOObjectRelease(service);

            return;
        }
    }
}

在 Swift 中(通过 @Dov ):

private func setBrightnessLevel(level: Float) {
    var iterator: io_iterator_t = 0

    let result = IOServiceGetMatchingServices(kIOMasterPortDefault,
                                              IOServiceMatching("IODisplayConnect").takeUnretainedValue(),
                                              &iterator)

    if result == kIOReturnSuccess {
        var service: io_object_t = 1

        for ;; {
            service = IOIteratorNext(iterator)

            if service == 0 {
                break
            }

            IODisplaySetFloatParameter(service, 0, kIODisplayBrightnessKey, level)
            IOObjectRelease(service)
        }
    }
}

(代码为open source of course)