升级 iOS 7.1.1 之后，Touch ID 的工作方式变得更智能，简单地说会越用越快越用越准确。
因为每一次使用 Touch ID 都会再收集指纹的数据，并对之前的记录做出修正，还能够预测可能产生的错误，减少不能识别的情况。换一种说法，根本不需要重新录入。也不受季节天气变化引起的皮肤指纹细微变化影响。即便首次设置时候录入的数据不够准确，也没有太大关系。所以，如果还有问题，请确认自己是否升级到 iOS 7.1.1
> With iOS 7.1.1 Apple now takes multiple scans of each position you place finger at setup instead of a single one and uses algorithms to predict potential errors that could arise in the future. Touch ID was supposed to gradually improve accuracy with every scan but the problem was if you didn’t scan well on setup it would ruin your experience until you re-setup your finger. iOS 7.1.1 not only removes that problem and increases accuracy but also greatly reduces the calculations your iPhone 5S had to make while unlocking the device which means you should get a much faster unlock time.
via iOS 7.1.1 Behind the scenes of touch ID : apple
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本文作者：David Chang
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