ios - CM高度計奇数データ

Question

CMAltimeter startRelativeAltitudeUpdatesToQueue: ブロックからデータを記録するアプリケーションがあります。記録は問題ありませんが、一部のデータが奇妙です。これは、私が記録に使用する非常に単純なスニペットです。

NSOperationQueue *queue = [[NSOperationQueue alloc] init];
[self.altitude startRelativeAltitudeUpdatesToQueue:queue withHandler:^(CMAltitudeData *altitudeData, NSError *error) {
        dispatch_async(dispatch_get_main_queue(), ^ {
            NSLog(@"Altitude: %f", altitudeData.relativeAltitude.floatValue);
        });
    }];

街を歩きながら記録を行ったところ、次のような奇妙な値が得られました。ご覧のとおり、+7 メートルから -225 メートルまで自由落下するようなものです。ドキュメントに記載されているように、高度はゼロである最初の高度レコードに相対的です。

CMAltimeter がどのように機能するかの私の理解に何か問題があるかどうかを説明する人はいますか? それともこれはバグですか？

ありがとう

2014-10-03 09:09:02.669 XXXXXXXXX[1811:13772492] altitude: 9.252784729003906
2014-10-03 09:09:02.669 XXXXXXXXX[1811:13772492] altitude: 9.252784729003906
2014-10-03 09:09:02.669 XXXXXXXXX[1811:13772492] altitude: 8.666885375976562
2014-10-03 09:09:02.669 XXXXXXXXX[1811:13772492] altitude: 7.081024169921875
2014-10-03 09:09:02.669 XXXXXXXXX[1811:13772492] altitude: -28.24831390380859
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -61.20027160644531
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -28.24831390380859
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -40.86483764648438
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -40.86483764648438
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -40.86483764648438
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -45.53067016601562
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -53.98106384277344
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -64.6231689453125
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -53.98106384277344
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -28.13791656494141
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -28.13791656494141
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -92.41580200195312
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -146.3153533935547
2014-10-03 09:09:02.670 XXXXXXXXX[1811:13772492] altitude: -160.0170745849609
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -181.5329132080078
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -181.5329132080078
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -181.5329132080078
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -199.3322296142578
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -193.2239837646484
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -199.3322296142578
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -209.9459381103516
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -209.9459381103516
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -187.6910858154297
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -187.6910858154297
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -197.9417877197266
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -201.6117706298828
2014-10-03 09:09:02.671 XXXXXXXXX[1811:13772492] altitude: -201.6117706298828
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -201.6117706298828
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -225.4467010498047
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -225.4467010498047
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -225.4467010498047
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -190.1396331787109
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -190.1396331787109
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -220.1163177490234
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -220.1163177490234
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -217.6054229736328
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -216.1069793701172
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -216.1069793701172
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -216.1069793701172
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -220.0596771240234
2014-10-03 09:09:02.672 XXXXXXXXX[1811:13772492] altitude: -208.4894256591797
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -208.4894256591797
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -181.7436370849609
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -120.3368835449219
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -37.50768280029297
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -37.50768280029297
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -37.50768280029297
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -35.98821258544922
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -35.98821258544922
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -33.94368743896484
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -33.94368743896484
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -25.50093841552734
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -25.50093841552734
2014-10-03 09:09:02.673 XXXXXXXXX[1811:13772492] altitude: -25.50093841552734
2014-10-03 09:09:02.674 XXXXXXXXX[1811:13772492] altitude: -51.27220153808594
2014-10-03 09:09:02.674 XXXXXXXXX[1811:13772492] altitude: -16.14826202392578
2014-10-03 09:09:02.674 XXXXXXXXX[1811:13772492] altitude: 2.517410278320312
2014-10-03 09:09:02.674 XXXXXXXXX[1811:13772492] altitude: 3.932975769042969
2014-10-03 09:09:02.674 XXXXXXXXX[1811:13772492] altitude: 4.590446472167969
2014-10-03 09:09:02.674 XXXXXXXXX[1811:13772492] altitude: 6.611000061035156
2014-10-03 09:09:02.674 XXXXXXXXX[1811:13772492] altitude: 6.611000061035156
2014-10-03 09:09:02.674 XXXXXXXXX[1811:13772492] altitude: 5.907508850097656

score 0 · Accepted Answer

あなたの結果は、コードの小さなバグが原因である可能性が最も高いです:

NSLog(@"Altitude: %f", altitudeData.relativeAltitude.floatValue);

次のようにする必要があります。

NSLog(@"Altitude: %f", altitudeData.relativeAltitude.doubleValue);

フォーマッタ '%f' は double 値を想定しています。

score -1 · Accepted Answer

-1

私の理解では、 %f は float を期待しています。%lf は double を期待します

于 2014-10-26T15:13:21.107 に答える

ios - CM高度計奇数データ

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