如何获取系统健康程序的权限和信息

1.首先,我们需要在xcode 中设置HealthKit的开关

2.在需要获取健康信息的地方导入# import<HealthKit/HealthKit.h>

@interface ViewController ()   @property (nonatomic, strong) HKHealthStore *healthStore;   @end

 在- (void)viewDidLoad中获取权限

- (void)viewDidLoad {     [super viewDidLoad];           //查看healthKit在设备上是否可用，ipad不支持HealthKit     if(![HKHealthStore isHealthDataAvailable])     {         NSLog(@"设备不支持healthKit");     }           //创建healthStore实例对象     self.healthStore = [[HKHealthStore alloc] init];           //设置需要获取的权限这里仅设置了步数     HKObjectType *stepCount = [HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount];           NSSet *healthSet = [NSSet setWithObjects:stepCount, nil];           //从健康应用中获取权限     [self.healthStore requestAuthorizationToShareTypes:nil readTypes:healthSet completion:^(BOOL success, NSError * _Nullable error) {         if (success)         {             NSLog(@"获取步数权限成功");             //获取步数后我们调用获取步数的方法             [self readStepCount];         }         else         {             NSLog(@"获取步数权限失败");         }     }];       }

 读取步数

//查询数据 - (void)readStepCount {     //查询采样信息     HKSampleType *sampleType = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount];           //NSSortDescriptors用来告诉healthStore怎么样将结果排序。     NSSortDescriptor *start = [NSSortDescriptor sortDescriptorWithKey:HKSampleSortIdentifierStartDate ascending:NO];     NSSortDescriptor *end = [NSSortDescriptor sortDescriptorWithKey:HKSampleSortIdentifierEndDate ascending:NO];           /*查询的基类是HKQuery，这是一个抽象类，能够实现每一种查询目标，这里我们需要查询的步数是一个     HKSample类所以对应的查询类就是HKSampleQuery。     下面的limit参数传1表示查询最近一条数据,查询多条数据只要设置limit的参数值就可以了      */     HKSampleQuery *sampleQuery = [[HKSampleQuery alloc] initWithSampleType:sampleType predicate:nil limit:1 sortDescriptors:@[start,end] resultsHandler:^(HKSampleQuery * _Nonnull query, NSArray<__kindof HKSample *> * _Nullable results, NSError * _Nullable error) {         //打印查询结果         NSLog(@"resultCount = %ld result = %@",results.count,results);         //把结果装换成字符串类型         HKQuantitySample *result = results[0];         HKQuantity *quantity = result.quantity;         NSString *stepStr = (NSString *)quantity;         [[NSOperationQueue mainQueue] addOperationWithBlock:^{                           //查询是在多线程中进行的，如果要对UI进行刷新，要回到主线程中             NSLog(@"最新步数：%@",stepStr);         }];               }];     //执行查询     [self.healthStore executeQuery:sampleQuery]; }