我想在不关闭显示屏的情况下截取近距离传感器。
通过文档,我知道有两个布尔变量:
proximityMonitoringEnabled
proximityState
并且这段代码
[UIDevice currentDevice].proximityMonitoringEnabled = YES;
当接近传感器检测到物体时,它会关闭显示屏,就像在通话时将电话靠近耳朵时一样。如何在接近传感器被遮盖时保持显示屏常亮?我想在不关闭显示屏的情况下截取近距离传感器。
通过文档,我知道有两个布尔变量:
proximityMonitoringEnabled
proximityState
并且这段代码
[UIDevice currentDevice].proximityMonitoringEnabled = YES;
当接近传感器检测到物体时,它会关闭显示屏,就像在通话时将电话靠近耳朵时一样。如何在接近传感器被遮盖时保持显示屏常亮?在阅读了关于此问题的不同论坛之后,我们得知目前在公共API中无法阻止iPhone接近传感器被遮挡时屏幕变黑。您可以通过通知中心告知传感器是否被遮挡,但是您无法控制其自然行为(即当它使屏幕变暗/黑时)。
苹果的文档指出:“不是所有的iPhone OS设备都有接近传感器。”要确定您的应用程序运行的设备是否支持接近监测,请将proximityMonitoringEnabled属性设置为YES,然后检查其值:
UIDevice *device = [UIDevice currentDevice];
[device setProximityMonitoringEnabled:YES];
if (device.proximityMonitoringEnabled == YES) {
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(proximityChanged:)
name:@"UIDeviceProximityStateDidChangeNotification"
object:device];
}
- (void) proximityChanged:(NSNotification *)notification {
UIDevice *device = [notification object];
NSLog(@"In proximity: %i", device.proximityState);
}
来源:http://www.whatsoniphone.com/blog/new-in-iphone-30-tutorial-series-part-4-proximity-detection/
将帮助检测传感器的当前状态。
公共API允许屏幕变暗:
[UIScreen mainScreen].wantsSoftwareDimming = YES;
[UIScreen mainScreen].brightness = $your_brightness_value;
// Create and open an event system.
IOHIDEventSystemRef system = IOHIDEventSystemCreate(NULL);
// Set the PrimaryUsagePage and PrimaryUsage that the AppleProxShim service uses
int page = 65280;
int usage = 8;
// Create a dictionary to match the service with
CFStringRef keys[2];
CFNumberRef nums[2];
keys[0] = CFStringCreateWithCString(0, "PrimaryUsagePage", 0);
keys[1] = CFStringCreateWithCString(0, "PrimaryUsage", 0);
nums[0] = CFNumberCreate(0, kCFNumberSInt32Type, &page);
nums[1] = CFNumberCreate(0, kCFNumberSInt32Type, &usage);
CFDictionaryRef dict = CFDictionaryCreate(0, (const void**)keys, (const void**)nums, 2, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
// Get the total of matching services with the above criteria
CFArrayRef srvs = (CFArrayRef)IOHIDEventSystemCopyMatchingServices(system, dict, 0, 0, 0, 0);
// Get the service
IOHIDServiceRef serv = (IOHIDServiceRef)CFArrayGetValueAtIndex(srvs, 0);
int interval = 1 ;
// Set an interval of 1 , to activate the sensor
IOHIDServiceSetProperty((IOHIDServiceRef)serv, CFSTR("ReportInterval"), CFNumberCreate(0, kCFNumberSInt32Type, &interval));
// add your event handler
IOHIDEventSystemOpen(system, handle_event, NULL, NULL, NULL);
int defaultInterval = 0;
IOHIDServiceSetProperty((IOHIDServiceRef)serv, CFSTR("ReportInterval"), CFNumberCreate(0, kCFNumberSInt32Type, &defaultInterval));
// close handles and release the IOHIDEventSystemRef
IOHIDEventSystemClose(system, NULL);
CFRelease(system);
void handle_event(void* target, void* refcon, IOHIDServiceRef service, IOHIDEventRef event) {
if (IOHIDEventGetType(event) == kIOHIDEventTypeProximity) { // Proximity Event Received
// not necessary, but if you want the value from the sensor, get it from IOHIDEventGetIntegerValue
int proximityValue = IOHIDEventGetIntegerValue(event, (IOHIDEventField)kIOHIDEventFieldProximityDetectionMask); // Get the value of the ProximityChanged Field (0 or 64)
// Call dimScreen with the boolean NO
int (*SBSSpringBoardServerPort)() = (int (*)())dlsym(RTLD_DEFAULT, "SBSSpringBoardServerPort");
int port = SBSSpringBoardServerPort();
void (*_SBDimScreen)(int _port,BOOL shouldDim) = (void (*)(int _port,BOOL shouldDim))dlsym(RTLD_DEFAULT, "SBDimScreen");
// This is where the logic to dim the screen based on the sensor value would go. In this case, I'm hardcoding NO instead of the value of proximityValue from above
// BOOL dim = proximityValue == 0 ? NO : YES;
_SBDimScreen(port, NO);
}
}
调用_SBDimScreen
可能并不必要,因为空函数指针可以阻止所有接近传感器事件。
代码修改自 iPhoneDevWiki 上的AppleProxShim页面上的命令行工具示例。
IOKit
实现。 - Daniel Storm[UIDevice currentDevice].proximityMonitoringEnabled = NO; // Disables the Proximity Sensor and won't turnoff the display when sensor covered
[UIDevice currentDevice].proximityMonitoringEnabled = YES; // Enables the Proximity Sensor and will turnoff the display when sensor covered
针对 Swift / iOS 10 / Xcode 8.2
UIDevice.current.isProximityMonitoringEnabled = true/false..