CMStepCounter 添加步数以分隔 NSInteger

Question

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

@interface CPPedometerViewController ()

@property (weak, nonatomic) IBOutlet UILabel *stepsCountingLabel;
@property (nonatomic, strong) CMStepCounter *cmStepCounter;
@property (nonatomic, strong) NSOperationQueue *operationQueue;
@property (nonatomic, strong) NSMutableArray *stepsArray;

@end

@implementation CPPedometerViewController

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

- (void)viewDidLoad
{
    [super viewDidLoad];

    [self QueryExistingStep];


    NSLog( @"steps array = %@", _stepsArray);

}

-(void)QueryExistingStep
{
    //get todays date
    NSDate *now = [NSDate date];
    // get six days ago from today
    NSDate *sixDaysAgo = [now dateByAddingTimeInterval:-6*24*60*60];

    //array to hold step values
    _stepsArray = [[NSMutableArray alloc] initWithCapacity:7];

    //check if step counting is avaliable
    if ([CMStepCounter isStepCountingAvailable])
    {
        //init step counter
        self.cmStepCounter = [[CMStepCounter alloc] init];

        //get seven days before from date & to date.
        for (NSDate *toDate = [sixDaysAgo copy]; [toDate compare: now] <= 0;
             toDate = [toDate dateByAddingTimeInterval:24 * 60 * 60] ) {

            //get day before
            NSDate *fromDate = [[toDate copy] dateByAddingTimeInterval: -1 * 24 * 60 * 60];

            [self.cmStepCounter queryStepCountStartingFrom:fromDate to:toDate toQueue:self.operationQueue withHandler:^(NSInteger numberOfSteps, NSError *error) {
                if (!error) {
                    NSLog(@"queryStepCount returned %ld steps", (long)numberOfSteps);
                    [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                        [self updateArrayWithStepCounter:numberOfSteps];
                    }];
                } else {
                    NSLog(@"Error occured: %@", error.localizedDescription);
                }

            }];

        }
    } else {
        // stuffhappens
    }
}

- (void)updateArrayWithStepCounter:(NSInteger)numberOfSteps {

    [_stepsArray addObject:[NSNumber numberWithInteger:numberOfSteps]];
}

@end

我正在寻找一个包含过去 7 天的步骤的数组，然后将它们插入到每天的 NSinteger 中。例如NSInteger daySeven = 242，NSInteger daySix = 823 ... 今天也是如此。

但是，在退出 updateArrayWithStepCounter 方法后，数组似乎清除了。关于如何解决这个问题的任何想法，所以每个步骤也进入单独的 NSIntegers。谢谢，瑞恩。

编辑：

这里是 NSLog 输出：

2014-01-25 22:51:36.314 Project[6633:60b] steps array = (
)
2014-01-25 22:51:36.332 Project[6633:420f] queryStepCount returned 3505 steps
2014-01-25 22:51:36.334 Project[6633:420f] queryStepCount returned 3365 steps
2014-01-25 22:51:36.335 Project[6633:420f] queryStepCount returned 7206 steps
2014-01-25 22:51:36.337 Project[6633:420f] queryStepCount returned 6045 steps
2014-01-25 22:51:36.339 Project[6633:420f] queryStepCount returned 5259 steps
2014-01-25 22:51:36.342 Project[6633:420f] queryStepCount returned 6723 steps
2014-01-25 22:51:36.344 Project[6633:420f] queryStepCount returned 440 steps

这是建议的输出。正如您所看到的，它肯定会获取值，但是当它在运行该方法后检查数组时，它现在是空的。

我会不会错误地将它添加到数组中？

我希望这更清楚我很难过。谢谢

Answer 1

首先，这个输出是什么？

NSLog(@"steps array = %@", _stepsArray);

当有人问你某事时，你应该尝试用所要求的确切信息来回复，只是说“它说数组是空的”并没有帮助，因为也许有人可以看到你在输出中看不到的东西.

说到这里，我会添加更多的 NSLog，因为可能是您的处理程序没有被调用，或者没有使用您期望的信息调用。

使用以下命令，让我们知道输出：)

[self.cmStepCounter queryStepCountStartingFrom:fromDate to:toDate toQueue:self.operationQueue withHandler:^(NSInteger numberOfSteps, NSError *error) {
    if (!error) {
        NSLog(@"queryStepCount returned %d steps", numberOfSteps);
        [[NSOperationQueue mainQueue] addOperationWithBlock:^{
            [self updateArrayWithStepCounter:numberOfSteps];
        }];
    } else {
        NSLog(@"Error occured: %@", error.localizedDescription);
    }

}];

编辑：从新发布的 NSLog 输出中，我可以理解问题所在。事实是处理程序异步运行，这意味着您不能只在 viewDidLoad 上输出数组，因为它在数组收到所有值之前运行，因此您应该重构代码以在所有数据准备好时触发方法.

这里对您的代码进行了更易读的修订（删除了一些无用的“复制”调用，更新了您的“条件”等），现在应该很容易理解发生了什么以及如何执行附加逻辑。

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

@interface PYViewController ()

@property (weak, nonatomic) IBOutlet UILabel *stepsCountingLabel;
@property (nonatomic, strong) CMStepCounter *cmStepCounter;
@property (nonatomic, strong) NSOperationQueue *operationQueue;
@property (nonatomic, strong) NSMutableArray *stepsArray;

@end

@implementation PYViewController

- (NSOperationQueue *)operationQueue {
    if (_operationQueue == nil) {
        _operationQueue = [NSOperationQueue new];
        _operationQueue.maxConcurrentOperationCount = 1; // process 1 operation at a time, or we could end with unexpected results on _stepsArray
    }
    return _operationQueue;
}

- (void)viewDidLoad {
    [super viewDidLoad];

    [self queryExistingStep];
}

-(void)queryExistingStep {
    // Get now date
    NSDate *now = [NSDate date];

    // Array to hold step values
    _stepsArray = [[NSMutableArray alloc] initWithCapacity:7];

    // Check if step counting is avaliable
    if ([CMStepCounter isStepCountingAvailable]) {
        // Init step counter
        self.cmStepCounter = [[CMStepCounter alloc] init];
        // Tweak this value as you need (you can also parametrize it)
        NSInteger daysBack = 6;
        for (NSInteger day = daysBack; day > 0; day--) {
            NSDate *fromDate = [now dateByAddingTimeInterval: -day * 24 * 60 * 60];
            NSDate *toDate = [fromDate dateByAddingTimeInterval:24 * 60 * 60];

            [self.cmStepCounter queryStepCountStartingFrom:fromDate to:toDate     toQueue:self.operationQueue withHandler:^(NSInteger numberOfSteps, NSError *error) {
                if (!error) {
                    NSLog(@"queryStepCount returned %ld steps", (long)numberOfSteps);
                    [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                        [_stepsArray addObject:@(numberOfSteps)];

                        if ( day == 1) { // Just reached the last element, do what you want with the data
                            NSLog(@"_stepsArray filled with data: %@", _stepsArray);
                            // [self updateMyUI];
                        }
                    }];
                } else {
                    NSLog(@"Error occured: %@", error.localizedDescription);
                }                
            }];
        }
    } else {
        NSLog(@"device not supported");
    }
}

@end

Answer 2

我要做的是等待数组获得所有需要的值，然后再做一些事情。它对我有用。

- (void)queryPast6DayStepCounts
{
   NSLog(@"queryPast6DayStepCounts visited!");

  self.past6DaysDailySteps = [[NSMutableArray alloc] initWithCapacity:6];

// past 6 days

for (NSInteger day = 6; day >= 1; day--)
{
    NSDate *fromDate = [self.todayMidnight dateByAddingTimeInterval:-day * 24 * 60 * 60];
    NSDate *toDate = [fromDate dateByAddingTimeInterval:24 * 60 * 60];

    [self.cmStepCounter
     queryStepCountStartingFrom:fromDate to:toDate
     toQueue:[NSOperationQueue mainQueue]
     withHandler:^(NSInteger numberOfSteps, NSError *error)
     {
         if (!error)
         {
                 [self.past6DaysDailySteps addObject:@(numberOfSteps)];
                 if (self.past6DaysDailySteps.count == 6) {
                     [self viewDidFinishQueryPast6DaysData];
                 }

         }
         else
         {
             NSLog(@"Error occured: %@", error.localizedDescription);
         }
     }
     ];

}
 }
 -(void)viewDidFinishQueryPast6DaysData
  {
    NSLog(@"queryPast6DayStepCounts finish! %@", self.past6DaysDailySteps);
   // do other things
 }