事實上沒有太多頻繁使用接近感應器價值(情況),
然而,Google Voice Search應用程式把接近感應器做了很好的利用,
將它作為一種手段來觸發語音搜索的請求。
如果您有興趣在做類似的東西,請繼續閱讀...
監測接近感應器
這一切都開始啟用接近感應器,接著設立一個通知,在當接近狀態的變化時,請求調用一個方法:
// Enabled monitoring of the sensor [[UIDevice currentDevice] setProximityMonitoringEnabled:YES]; // Set up an observer for proximity changes [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(sensorStateChange:) name:@"UIDeviceProximityStateDidChangeNotification" object:nil];
接近感應器狀態更新時,下面的方法將被調用,會輸出訊息到debug console。
- (void)sensorStateChange:(NSNotificationCenter *)notification { if ([[UIDevice currentDevice] proximityState] == YES) NSLog(@"Device is close to user."); else NSLog(@"Device is ~not~ closer to user."); }
檢測接近感應器
並非所有的iOS裝置都有接近感應器。蘋果官方API文件說到你應該開啟setProximityMonitoringEnabled和檢查proximityState狀態,如果proximityState返回值是NO,則設備是沒有感應到的狀態。
我目前無法成功地使用這種方法來判斷裝置是否有一個接近感應器。任何的意見或建議都歡迎大家提出。
文章來源:http://iphonedevelopertips.com/device/using-the-proximity-sensor.html
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