距离传感器集成在UIDevice类中,Apple电话APP自动开启距离传感器,但是开发者自己的APP需要手动开启距离传感器

开启方式很简单,只需一行代码:

//  开启距离传感器
[UIDevice currentDevice].proximityMonitoringEnabled = YES;

使用场景:
通常是在语音,网络会话时,当手机贴近脸部时,关闭屏幕,或执行某些操作

监听距离变化(通知),使用UIDevice的proximityState属性:

@property(nonatomic,readonly) BOOL proximityState

    //  监听距离的变化(通知)
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(proximityStateDidChange) name:UIDeviceProximityStateDidChangeNotification object:nil];

- (void)proximityStateDidChange{
    
    if ([UIDevice currentDevice].proximityState) {
        
        // 近距离
        NSLog(@"滚远点,贴脸上了");
        
    } else {
        
        // 远距离
        NSLog(@"亲爱的,靠近点");
        
    }
}

实例代码:

#import "ViewController.h"
@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //  开启距离传感器
    [UIDevice currentDevice].proximityMonitoringEnabled = YES;
    
    //  监听距离的变化(通知)
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(proximityStateDidChange) name:UIDeviceProximityStateDidChangeNotification object:nil];
    
}

- (void)proximityStateDidChange{
    
    if ([UIDevice currentDevice].proximityState) {
        
        // 近距离
        NSLog(@"滚远点,贴脸上了");
        
    } else {
        
        // 远距离
        NSLog(@"亲爱的,靠近点");
        
    }
}

@end

还可以通过距离监听,来判断是否禁止自动锁屏,需要使用UIApplication的idleTimerDisabled属性

@property(nonatomic,getter=isIdleTimerDisabled) BOOL idleTimerDisabled;

演示代码:

NSString *sessionType = @"语音";
if ([sessionType isEqualToString:@"语音"]) { //语音
    
    [UIDevice currentDevice].proximityMonitoringEnabled = YES;
    
} else {  //视频
    
    [UIDevice currentDevice].proximityMonitoringEnabled = NO;
    //禁用自动锁屏
    [UIApplication sharedApplication].idleTimerDisabled = YES;
}