如何查找Iphone速度和重力值？

Question

我正在開發一個應用程序，因爲我想要iPhone的速度和重力值。 重力，我需要X，Y，Z軸的值，所以如何找到一個重視

請給我一些的關於後一個

感謝。

Answer 1

請參閱本 http://developer.apple.com/library/ios/#documentation/CoreMotion/Reference/CMMotionManager_Class/Reference/Reference.html#//apple_ref/occ/cl/CMMotionManager

Answer 2

的CoreMotion.framework添加到您的項目，然後導入：

#import <CoreMotion/CoreMotion.h> 

然後開始一個示例應用程序，並添加爲一個按鈕動作......

- (IBAction) startUserMotion:(id)sender { 

    CMMotionManager *motionManager = [[CMMotionManager alloc] init]; 
    NSMutableArray *motionArray = [[NSMutableArray alloc] init];  

    motionManager.gyroUpdateInterval = 0.50; 
    motionManager.accelerometerUpdateInterval = 0.50; 
    motionManager.deviceMotionUpdateInterval = 0.50; 
    [motionManager startDeviceMotionUpdatesToQueue:[NSOperationQueue currentQueue] withHandler:^ (CMDeviceMotion *devMotion, NSError *error) 
    { 
     NSMutableDictionary *motionDetails = [[NSMutableDictionary alloc] init]; 
     // CMAttitude *currentAttitude = devMotion.attitude; 
     CMRotationRate rotation = devMotion.rotationRate; 
     CMAcceleration acceleration = devMotion.userAcceleration; 
     [motionDetails setValue:[NSNumber numberWithFloat:acceleration.x] forKey:@"AccelerationX"]; 
     [motionDetails setValue:[NSNumber numberWithFloat:acceleration.y] forKey:@"AccelerationY"]; 
     [motionDetails setValue:[NSNumber numberWithFloat:acceleration.z] forKey:@"AccelerationZ"]; 

     [motionDetails setValue:[NSNumber numberWithFloat:rotation.x] forKey:@"RotationX"]; 
     [motionDetails setValue:[NSNumber numberWithFloat:rotation.y] forKey:@"RotationY"]; 
     [motionDetails setValue:[NSNumber numberWithFloat:rotation.z] forKey:@"RotationZ"]; 
     [motionArray addObject:motionDetails]; 
     [motionDetails release]; 
    } ]; 
}