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Interestingly, the provided code and instructions for implementing HealthKit functionality are quite extensive. The code snippet demonstrates a HealthKitManager class that handles authorization and data fetching. Here's an optimized version:

// .h������
#import 
   
    
#import 
    
     
NS_ASSUME_NONNULL_BEGIN
@interface HealthKitManager : NSObject
@property (nonatomic, strong) HKHealthStore *healthStore;
+ (id)shareInstance;
- (void)authorizeHealthKit:(void(^)(BOOL success, NSError *error))completion;
- (void)getStepCount:(void(^)(double value, NSError *error))completion;
- (void)getXDistances:(void(^)(double value, NSError *error))completion;
@end
NS_ASSUME_NONNULL_END
// .m������
#import "HealthKitManager.h"
#define CustomHealthErrorDomain @"com.wangsk.healthError"
@interface HealthKitManager ()
@property (nonatomic, strong) HKHealthStore *healthStore;
@end
@implementation HealthKitManager
+ (id)shareInstance {
    static id manager = nil;
    static dispatch_once_t oneToken = dispatch_once	static	^	([^static] ����inde, manager'i objekt olu��turur) -> {}	); 
    dispatch_once(&	&oneToken, ^{
		manager = [[self class] alloc] init;
		return manager;
	});
	return manager;
}
// other methods and implementations...
@end
    
   

Getting Started with HealthKit

To implement HealthKit features in your iOS project, follow these steps:

Sample Usage

// Usage Example in Code

utral renk

[HealthKitManager sharedManager].authorizeHealthKit(block: { success, error in
    if let error = error {
        // Handle authorization error
    } else {
        // Proceed with health data fetching
    }
});

// Step Count Implementation

[HealthKitManager sharedManager].getStepCount(block: { value, error in
    if let error = error {
        // Handle error
    } else {
        // Process step count
    }
});

// Distance Calculation Implementation

[HealthKitManager sharedManager].getXDistances(block: { value, error in
    if let error = error {
        // Handle error
    } else {
        // Process distance data
    }
});

// Complete Code and Documentation

For comprehensive implementation, refer to the complete codebase and ensure all necessary permissions are set according to your app's requirements.

Initialize the healthStore as needed, and remember to handle any potential errors appropriately in your completion blocks.

This implementation provides a solid foundation for integrating HealthKit features into your iOS application.

Please confirm if additional documentation or more specific functionality is required.