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iOS

Introduction to HealthKit with Core Bluetooth


In my last Core Bluetooth tutorial, I discussed the technology, applications, and benefits of Apple’s Core Bluetooth framework. I showed you how to build an app that wirelessly connected to a Bluetooth® heart rate monitor (HRM) — a small, portable, and “wearable” device. My sample app’s code read heart rate data from the HRM, but it didn’t do anything with the heart rate data except display it in real-time on an iPhone’s screen. While edifying and interesting, there are already a bazillion apps in the App Store that can read heart rate data, and other wearable data, using Core Bluetooth. What about doing something interesting with that data, like analyzing it, deriving value-added and meaningful results from it, and sharing it with researchers? That’s where Apple’s HealthKit framework shines.

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  • 不动产登记新政靴子落地 长三角房市反应冷淡
  • Discuss the privacy implications of developing apps that can read/write a user’s very personal health data.
  • One of the best things you can do to improve your entire life, not just school, is meditate. Fifteen minutes a day is all you need to feel calm, centered and confident.
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  • 自此之后,中国每年都会发布以12生肖属相为主题的农历新年纪念邮票。
  • For almost everyone else, it was a year of frustration against a backdrop of better-than-average returns for the most popular index in the land.

“…was checking his cell phone and chewing gum during the meeting.”
维尔德斯在周一晚上的电视辩论中呼吁荷兰将土耳其大使驱逐出境。
v. 操作,运转,经营,动手术
“失业”是金融类最热门的搜索项,其次是“华尔街公司”和“产品召回”。

What is HealthKit?

Isn’t that kind of an obvious question to answer? The HealthKit framework can collect, store, and organize all sorts of data regarding a person’s physical, mental, and even arguably spiritual state. The Health app you all see on your iPhones is Apple’s portal to the framework, but developers can take advantage of the HealthKit API to create their own health-related apps. Some data tracked by HealthKit can only be entered by the user, and is read-only to developers (like date of birth). Other data, like a user’s heart rate and blood pressure, can be collected and written into the HealthKit by developers — and they can read that data, too. In fact, once an app stores data in HealthKit, that data is available to all other apps, but only if the user consents on an app-by-app and health-data-point-by-data-point basis. Users have very granular control over their health data. Let me be emphatic: You can only access HealthKit data with the user’s consent.

You must keep users’ health data private

Before submitting a HealthKit app to the App Store, remember to follow all of Apple’s guidelines, i.e., “You must also provide a privacy policy for any app that uses the HealthKit framework.”

What’s all this privacy stuff? Think about it: Would you want someone you didn’t know, and without your knowledge, collecting all sorts of personal information about you, like your sexual activities, your blood alchohol content, your age, your average heart rate…? Ah… no. Information is power.

Just consider the ethical considerations of having access to peoples’ health data. Would it be moral to take advantage of their personal data? Not from my standpoint. But what if you provided a means for them to specifically control all of their health data, and only with their full knowledge and consent, willfully provide access to some or all of that data? HealthKit provides a firewall for Apple customers to have that level of control:

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在观影从始至终,我都在问自己一个问题:这部电影到底在讲什么……这部电影的主题仿佛一锅杂烩,并不明晰。我希望制片人也在问同样的问题。
2) I Trust Your Judgment: Translation: “You have my permission. I believe in you. Now, go make it happen.” Feels pretty uplifting to hear that, doesn’t it? And I’ll bet you’d do almost anything to please someone who makes you feel that way. Your employees and peers are no different.
Their positional matchups with both Cleveland and Boston now look much more palatable.
5.X-Men: Apocalypse
报告还发现,在“智力资本和创新”及“技术成熟度”等指标方面排名较高的城市综合排名也很高,这很明确地表明,技术上先进的城市更有可能成为“机遇城市”。
单词encourage 联想记忆:
伦敦阿格纽艺术品交易所(Agnew’s)的主管安东尼·克赖顿-斯图尔特(Anthony Crichton-Stuart)说:“如果没有意识到我们处在非常危急的关头,那就太天真了。人们的偏好出现了重大转变。但是如果拍卖会上出现一幅18世纪前绘画大师的佳作,而且价位合理,人们还是会感到兴奋。”
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分析师们表示,未来几个月整体进口数据可能开始好转,因为大宗商品价格下跌在2014年底尤为显著,这将意味着按价值计算的中国进口同比降幅较小。
That figure is more than two times the city's population of about 10 million.

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The biggest brands outperform financial markets, according to BrandZ, which says this illustrates their financial power and value to shareholders.
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It’s not just ethics and morality that drives these privacy control mechanisms, there’s a law that is now a household word. With the proliferation of personal health data collection mechanisms, be they paper or electronic, the United States Congress passed a law governing privacy for health records in 1996, the 上海金融学院的研究人员郭峰引用了周二华尔街见闻上的信息并表示,这也是自1978年中国改革开放以来,上海第一次见证了常住人口的减少 。.

HealthKit can help your career

Just as I discussed how Core Bluetooth can advance your career, think of adding proficiency in HealthKit to your resume. The two technologies are practically married in the realm of health. Look at what I accomplished in my last tutorial and this one. I can read heart rate data from any Bluetooth® Low Energy HRM, and write it to and read it from the HKHealthStore. Do you know how much incredibly meaningful information can be gleaned from a user’s heart rate? If you can figure out how to add support, say, for a Bluetooth® blood pressure monitor and Bluetooth® pulse oximeter, and then combine the data from those two devices with heart rate data to derive some meaningful health metric, then the sky’s the limit.

The money to hire developers for health-related apps and health-device-combination apps is out there. According to PRNewswire:

同时,该官员称,由于中央政府鼓励更多的大学毕业生到市县工作,今年的招录岗位中,有78%是区、县级的工作。
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一、2016年工作回顾
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1=somewhat false

According to Visiongain:

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That’s a lot of money. Good apps are developed by good companies who hire talented and passionate developers. The money’s there to hire you if you have the right skills. If you like to go it alone and have that entrepreneurial spirit, go for it. The money’s there for you, too.

When building apps, make sure you don’t make any claims that require 家居市场受到地产行业侵蚀 如何自救? approval — unless you’ve got the time and resources to go through the medical device approval process. Don’t make claims about your app that aren’t backed up by some hard, scientific research. But don’t get scared and run away either.

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Do your homework. Read the assigned pages, and then some. Plug your topic into the Internet, grab another book at the library, and see what else you can learn about the subject.

Writing the Code

In this discussion, I’m making the assumption that you understand the basics of iOS app development, including the Swift programming language and an Xcode Single View App template. In this tutorial’s code, I use no user interface (UI). I only show console output. HealthKit is so big and overwhelming that I want you to concentrate on the Swift code and HealthKit SDK API’s classes, methods, properties, and constants. The user interface (UI), including Auto Layout, for my “Core Bluetooth HRM” app, whose code is shown in my previous tutorial, and to which I’ve added the code shown below, is trivial.

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I’m going to extend the project I explained in my tutorial on Core Bluetooth. Remember that that code read heart rate data from a wearable — an HRM — and displayed it on screen. That app, named “Core Bluetooth HRM,” didn’t save any of the heart rate data collected from the HRM. We’ll do that in this tutorial. Please remember the app name, “Core Bluetooth HRM,” as we’re going to see it pop up in important places.

Preparing the app in Xcode

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adj. 商业的
据悉,地方级的工作经验将对申请者有利,其中有两年以上工作经验的人员将会具有一定的优势。

智能照明不能仅是概念叠加 实用性不强如何推广

Click on the project name in the Project Navigator, click on the target name, click on the Capabilities tab, and then switch HealthKit to the “ON” position:

Enable HealthKit Capability

• You must be a member of the Apple Developer Program to use HealthKit.

That means having provisioning profiles, development certificates, distribution certificates, among other things, but in this case, especially a development team. If you haven’t set up Signing in your app, you’ll get the following message after turning HealthKit to the “ON” position:

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• Turn on code signing.

Click on the project name in the Project Navigator, click on the target name, click on the General tab, and expand the Signing section.

一有机会就炫一下小卷毛。

Assign Team

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智能皮带
"Another interesting aspect of this year's list is that more short numerical passwords showed up even though websites are starting to enforce stronger password policies."

You’ll find the Xcode Identity section ust above the Signing section we just discussed. Apple — and you — should take integrity seriously when using peoples’ health data. You need to show that your app is indeed your app.

In the “Bundle Identifier” field, make sure you prefix the app ID with your reversed domain name. According to Apple:

“我首要的使命、首要的责任是忠实于这本书的原始感觉,忠实于伊恩·弗莱明:他的作品、他的世界和他的构想。
201007/109869.shtml
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Feud: Bette and Joan
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Remember I’m adding HealthKit support to my “Core Bluetooth HRM” app. I also played with the Apple “Fit” demo app. When first installing both apps on my devices from Xcode, I received the following error message:

Do what the previously-shown message box says. Settings should now look like this:

• There’s one final step, and my app will crash without it:

In your app’s info.plist, set the NSHealthShareUsageDescription key to customize the message for reading data. Set the NSHealthUpdateUsageDescription key to customize the message for writing data.

Whenever you even think about reading from or writing to HealthKit, you ask the user for authorization using built-in “permissions sheets.” These sheets will contain the custom messages from the Info.plist file. Here’s a snippet from mine:

单词unique 联想记忆:

The Simple Scenario: Reading one fixed value with Swift 4

Let’s start with reading one HealthKit fixed “characteristic,” a value that can only be written by the user and only read by an app, if the user consents.

I’m going to describe the code in a series of steps — steps that are also comments in my code shown below. So as you read the steps in this section, please refer to those same steps in the code below. The setup process is basically linear, but reading from the HealthKit data store is asynchronous. Reads have completion blocks which run on background queues. If you want to update the UI from a completion handler, you better jump back onto the main thread. For tutorials on completion blocks, see here and here. For jumping onto the main thread, see here.

I’ve chosen to wrap all HealthKit functionality for my “Core Bluetooth HRM” app in a class, HealthKitInterface.

The code steps in English
Step 1: Import the HealthKit framework. That gives me access to HealthKit symbols that 合生创展委任席荣贵为执行董事及行政总裁 年薪500万元

Step 2: Create a member property to store an instance of HKHealthStore, the “access point for all data managed by HealthKit.”

Step 3: Create a member property that we’ll use to ask HealthKit about the user’s gender. An HKCharacteristicType represents data the user enters themselves during setup of the iOS Health app. I’m deliberately starting with a fixed characteristic to differentiate from the process of reading or writing information like heart rate data, of which I can collect numerous samples, and read samples from devices or from HealthKit itself to perform custom analysis. I can also collect heart rate samples from a device or app and write those into HealthKit. From Apple:

Unlike the other object types, characteristic types cannot be used to create and save new HealthKit objects. Instead, users must enter and edit their characteristic data using the Health app. Similarly, you cannot create queries for characteristic types. Instead, use the HealthKit store to access the data (see Reading Characteristic Data).

Step 4: For flexibility, the HealthKit API allows us to ask about multiple characteristics at once. So I create a Set as specified by the API as you’ll see below.

Step 5: Make sure HealthKit is available because [':tn]

Step 6: Create one instance of the HealthKit data store. It’s the conduit to all health data. Read the docs: “You need only a single HealthKit store per app. These are long-lived objects. Create the store once, and keep a reference for later use.”

Step 7: I create a Set of one HKCharacteristicType as that’s what the next call, requestAuthorization, wants, so it knows what data I’m asking for permission to access. See next step.

Step 8: This step is where all the action in this part of my app happens. First, I ask the user for permission to read their gender type. Once I get permission from the user, I … go to Step 9.1 below. Read the doc on requestAuthorization(toShare:read:completion:). The permission request is asynchronous.

Step 9.1 I 环境污染愈发受重视 水性涂料由此应运而生 by calling by calling my API wrapper method readGenderType(). I’m doing so in the completion handler for requestAuthorization. Remember that the completion block is called on a background queue, so be sure to jump back on the main thread if you want to update the UI with the user’s gender here.

Step 9.2 My API wrapper method readGenderType() takes care of the details surrounding the actual HKHealthStore call to biologicalSex().

Seeing is believing – Simple: Reading one fixed value with Swift 4

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Samsung’s comment was shorter: “Media reports of the acquisition are groundless.”
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What the app looks like
The user first sees a HealthKit screen asking to give permission to my app, “Core Bluetooth HRM,” to read gender:

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If the user 1) pushes the UISwitch for “Sex” to the “ON” position and then 2) presses the “Allow” button, I get HealthKit authorization just to read gender, I read it, and write it to the console as shown here:

The initialization code
This is the high-level code in my “Core Bluetooth HRM” app that leverages my core HealthKitInterface class. I declare an instance variable of my HealthKitInterface type in my UIViewController subclass, HeartRateMonitorViewController. Then I ask for permission to read gender and read that value if the user consents. This is all done in the init() for class HealthKitInterface. It’s pretty straightforward. This snippet is a modified version of the code from my last tutorial on Core Bluetooth.

The core HealthKit code for a single read
I added a Swift file to my “Core Bluetooth HRM” app named HealthKitInterface.swift. It contains my HealthKitInterface class. Remember to review the steps I explained above when reading my corresponding inline comments in the code below:

The Complex Scenario: Reading and writing samples with Swift 4

Let’s explore a more complex scenario. I’m going to develop code that writes data to and reads data from the HKHealthStore. This is more complex data than gender (just one value of .female, .male, or .unspecified) that is maintained solely by the user. I can collect thousands of samples of heart rate data values and store them in the HKHealthStore. Heart rate samples can be collected from multiple devices and/or apps besides my own. I can read all heart rate data or just a specific date range from the HKHealthStore. Heart rate has a measurement unit (beats per minute). I’ll have to write some code to accomodate this more complex data type.

I’m going to describe the code in a series of steps — steps that are also comments in my code shown below. So as you read the steps in this section, please refer to those same steps in the code below. The setup process is basically linear, but reading from and writing to the HealthKit data store is asynchronous. Reads and writes have completion blocks which run on background queues. If you want to update the UI from a completion handler, you better jump back onto the main thread. For tutorials on completion blocks, see here and here. For jumping onto the main thread, see here.

I’ve chosen to wrap all HealthKit functionality for my “Core Bluetooth HRM” app in a class, HealthKitInterface.

The code steps in English
Step 1: Import the HealthKit framework. That gives me access to HealthKit symbols that 房贷利率降息 一月月供会因分段计息不降反升

Step 2: Create a member property to store an instance of HKHealthStore, the “access point for all data managed by HealthKit.”

Step 3: Create member properties that we’ll use to ask HealthKit about heart rate data. We use the HKQuantityType, which are “Quantity types [that] identify samples that store numerical values” like heart rate samples. These are types of data that can change, be collected in large quantities, and for which we can define our own sample types.

For flexibility, the HealthKit API allows us to ask about multiple HKQuantityTypes at once. So I create a Set each for reading and writing as specified by the API as you’ll see below. Note that I could’ve used one property, but I used two for semantic clarity (i.e., reading is different than writing).

Step 4: Make sure HealthKit is available because 跳水游泳花样游泳篮球小轮车曲棍球田径

Step 5: Create one instance of the HealthKit data store. It’s the conduit to all health data. Read the docs: “You need only a single HealthKit store per app. These are long-lived objects. Create the store once, and keep a reference for later use.”

Step 6: I create two Sets of HKQuantityTypes as that’s what the next call, requestAuthorization, wants, so it knows what data I’m asking for permission to access. See next step. Notice that HKQuantityTypeIdentifier.heartRate is one of the predefined types already known to HealthKit.

Step 7: I ask the user for permission to read and write their heart rate data. Once I get permission from the user, I configure my code to write some heart rate data, and then I configure it to read the most recently-stored heart rate data. Read the doc on requestAuthorization(toShare:read:completion:). The permission request is asynchronous.

Step 8.0: This method is my wrapper for writing one heart rate sample at a time to the HKHealthStore. We’re building a specification to tell the HKHealthStore precisely what data and meta data we’re writing into it.

Step 8.1: The HKUnit.count() definition: “Count units are used to represent raw scalar values. They are often used to represent the number of times an event occurs…” like heart beats per minute.

Step 8.2: HKQuantity: “HealthKit uses quantity objects to store numerical data. When you create a quantity, you provide both the quantity’s value and unit.” Read this line of code. You should be able to tell that it’s taking a numeric heart rate measurement and is specifying it with context:

Step 8.3: Using HKQuantityType.quantityType is the final step is specifying a heart rate in beats per minute for storage in the HKHealthStore. From the doc I linked to: “HealthKit uses quantity types to create samples that store a numerical value. Use quantity type instances to create quantity samples that you can save in the HealthKit store.”

Step 8.4: HKQuantitySample: “you can use a quantity sample to record … the user’s current heart rate…” I’ve got my heart rate measurement with context ready for storage. By setting both the start and end dates to the same date/time stamp, I’m recording one heart rate measurement at one point in time.

Step 8.5: HKHealthStore.save: I’m saving an array of one heart rate measurement with a single date/time stamp to the HKHealthStore. This is an asynchronous call and the completion block is invoked on a background queue. If you’re going to update the UI in the completion block, you better jump onto the main thread.

Step 9.0: This is my wrapper method for reading all “recent” heart rate samples from the HKHealthStore. Think about this in terms of a database query that may take awhile to complete based on how you fine-tune the WHERE clause.

Step 9.1: Just as in Step 6 above, we’re telling the HealthKitStore that we’re interested in reading — querying for — heart rate data.

Step 9.2: HKAnchoredObjectQuery is a “query that returns only recent changes to the HealthKit store; this query both returns a snapshot of new changes, and can continue to monitor the store as a long-running query.” To keep this tutorial from drowning you in details, I’ve created a query against HealthKitStore that is constrained only to looking for “recent” heart rate data. Notice that I’ve set no predicate, no anchor, and no limit. If you think about it in pseudo-SQL, the query is akin to:

['pr?ut?k?l]

Click on HKAnchoredObjectQuery to get an overview and detailed instructions for limiting the scope of your queries — and how to continually “monitor the store as a long-running query.”

Step 9.3: Execute the query for heart rate data.

Seeing is believing – Complex: Reading and writing samples with Swift 4

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“It’s eerie how similar this space is to CRM when Marc Benioff launched Salesforce.com,” said Mitch Harper, who co-founded the company in 2009 with co-CEO Eddie Machaalani. “The parallels are uncanny.”
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What the app looks like
The user first sees a HealthKit screen asking to give permission to my app, “Core Bluetooth HRM,” to read and write their heart rate data:

The user must slide both UISwitch controls to the “ON” position and then press the “Allow” button.

I first record a few seconds worth of heart rate data. Remember that these data samples will be associated with my “Core Bluetooth HRM” app since it’s communicating with an HRM — and I’m wearing that HRM. Here’s some console output during this recording of HRM data and writing it to the HKHealthStore:

I can use my iPhone to look at the data I just recorded using my HRM and “Core Bluetooth HRM” app. Remember my app wrote to the HKHealthStore. I just use Apple’s Health app, go to its Health Data tab, then Heart table view cell, pick one of the big red squares labelled Heart Rate, and then click its (i) button. Then I click the Show All Data table view cell:

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I then configure my “Core Bluetooth HRM” app to read the most recent heart rate data that’s been written to the HKHealthStore using a “query.” I write its output to the console. This query runs for awhile. You can see what I mean here:

Tesla has an order backlog of $226 million. At the production run rate of 1000 cars a week expected at the end of 2014, that translates to a 30-week backlog.
总之,尤吉利用特伦斯-罗斯、贾里德-萨林杰以及三个选秀权换来了两名季后赛老兵。

The initialization code
This is the high-level code that leverages my core HealthKitInterface class in my “Core Bluetooth HRM” app. First, I’ll write a few seconds of heart rate samples to the HKHealthStore using my “Core Bluetooth HRM” app:

Then I’ll read the most recent heart rate samples from the HKHealthStore using my “Core Bluetooth HRM” app. All’s I need to do is 1) comment out the call to healthKitInterface.writeHeartRateData in method deriveBeatsPerMinute and 2) call healthKitInterface.readHeartRateData in the viewDidLoad of the HeartRateMonitorViewController class:

The core HealthKit code for a multiple reads and writes
Here’s the meat of my HealthKit code for reading and writing data to the HealthKitStore. This code requests user authorization to health data, writes heart rate samples to the HealthKitStore, and reads heart rate samples from the HealthKitStore.

Conclusion

I hope you’ve enjoyed this tutorial on Apple technology for health-related apps. Buy or borrow a Bluetooth® Low Energy device and use my code with it or write your own. Follow all the hyperlinks I’ve provided in the article and read them. You should definitely study Apple’s HealthKit documentation at this link, this link and this link. Download and practice with Apple’s “Fit” demo app. It’s written in Objective-C, but you’re all adaptable people. I like Objective-C.

Once proficient in HealthKit and/or Core Bluetooth, broaden your horizons by looking into Apple’s ResearchKit and CareKit. Apple says that:

5. Will China's migrant workers get permanent urban residence in 2010?
与此同时,有一首非常有意思的歌曲来自我们的读者Libby Russell,是她为所有世界杯期间的足球寡妇所作。非常感谢Libby的分享,太棒了!
Whatever she needs to invoke the weightlessness of life in our new not-normal, she takes. "Is it the end of an era? Is it the end of America?" she intones in "When the World Was at War We Kept Dancing." "No, it's only the beginning."
Entertainer of the year: Luke Bryan
由于新出口订单增幅与上月基本持平,新订单总量增长趋缓。但就业流失加速,投入品价格增幅收窄,企业对客户收取的价格略有回升。
Inflation (and deflation) won't rear its ugly head Surging oil production — along with slower global growth — has caused the price of petroleum to collapse from more than $100 a barrel last summer to barely $50 a barrel at the end of 2014. The effect has been to reverse an uptick in U.S. inflation earlier in the year.

Bank of China followed the trend, with profits up only 1.3 per cent and ROAA declining by 0.1 percentage points.
Regarding Syria, Putin said the Russian military operation will continue until a political process starts. And he said the Syrian people must determine who rules the country. He also said he does not know whether Russia needs a permanent military base in Syria.

For reference, you can check out the full source code on GitHub.

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