Скачать или смотреть Solving the NSHealthUpdateUsageDescription Error: Requesting Read Authorization Only for HealthKit

Discover how to resolve the `NSHealthUpdateUsageDescription` error when requesting read-only access to HealthKit in your iOS app.
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This video is based on the question https://stackoverflow.com/q/63527314/ asked by the user 'ccamaisa' ( https://stackoverflow.com/u/9710979/ ) and on the answer https://stackoverflow.com/a/63530058/ provided by the user 'john elemans' ( https://stackoverflow.com/u/1009270/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: NSHealthUpdateUsageDescription must be set to request write authorization forHKQuantityTypeIdentifierStepCount

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The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

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Understanding the HealthKit Authorization Issue

If you are developing an iOS application that uses HealthKit to access step data, you might encounter an error related to NSHealthUpdateUsageDescription. This can be particularly confusing if you are only looking to read data and are not intending to write to HealthKit.

The error typically raises its head when the authorization request includes the option to share (or write) data. This will trigger a prompt for write permissions, which may not be necessary for your requirements. Let’s break down the issue and provide a clear solution.

The Problem

In your code, you intend to fetch step count data for a single day. However, HealthKit perceives your request as an attempt to write data as well, prompting for write authorization when you don’t need it. This can lead to confusion for users who only want to grant read access.

The Solution

To resolve this issue, you need to make a simple modification in your authorization request.

Update the Authorization Request

Instead of including a toShare set with the health data you want to store, you can either set this parameter to nil or an empty set. Here’s how you can change your existing code:

Original Code Snippet:

[[See Video to Reveal this Text or Code Snippet]]

Revised Code Snippet:

[[See Video to Reveal this Text or Code Snippet]]

Why This Works

Changing toShare to an Empty Set: By passing an empty set for the toShare parameter, you indicate to HealthKit that you are not requesting any permission to write data. This eliminates the unwanted prompt for write permissions.

Retaining Read Permissions: You still specify which data you want to read (in this case, the step count), ensuring you still retain the ability to access the information without interruption.

Conclusion

Adjusting the way you set authorization parameters in HealthKit can significantly enhance user experience by removing unnecessary permission requests. By only asking for read permissions, your application stays focused on just what it needs, simplifying the authentication process.

If you've encountered the NSHealthUpdateUsageDescription issue while working with HealthKit, follow the steps outlined above for a quick resolution. Happy coding!