5

我想知道是否有人可以向我展示如何实现 CMStepCounter 的示例。(我已经查看了文档,但对于如何实现仍然有些困惑)。

每次采取步骤时,我都希望在我的视图上更新 UILabel。我还希望让应用程序在关闭时继续计算步数。

我对 iOS 比较陌生,任何帮助将不胜感激 :) !

谢谢,瑞安

4

1 回答 1

9

您应该按如下方式实现它

#import "ViewController.h"
#import <CoreMotion/CoreMotion.h>

@interface ViewController ()

@property (weak, nonatomic) IBOutlet UILabel *stepsCountingLabel;  // Connect this outlet to your's label in xib file.
@property (nonatomic, strong) CMStepCounter *cmStepCounter;
@property (nonatomic, strong) NSOperationQueue *operationQueue;

@end

@implementation ViewController

- (NSOperationQueue *)operationQueue
{
    if (_operationQueue == nil)
    {
        _operationQueue = [NSOperationQueue new];
    }
    return _operationQueue;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    if ([CMStepCounter isStepCountingAvailable])
    {
        self.cmStepCounter = [[CMStepCounter alloc] init];
        [self.cmStepCounter startStepCountingUpdatesToQueue:self.operationQueue updateOn:1 withHandler:^(NSInteger numberOfSteps, NSDate *timestamp, NSError *error) 
         {
            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                [self updateStepCounterLabelWithStepCounter:numberOfSteps];
            }];
        }];
    }
}

- (void)updateStepCounterLabelWithStepCounter:(NSInteger)countedSteps 
{
    self.stepsCountingLabel.text = [NSString stringWithFormat:@"%ld", (long)countedSteps];
}

@end

但是请注意,有时 startStepCountingUpdatesToQueue 的块会延迟更新 numberOfSteps。

于 2014-01-05T19:31:05.333 回答