Xcode iPhone加速计图片

Question

我是法国人，所以请原谅我的英文。所以我使用加速度计，但在我的代码中，加速度计用于视图而不是图像。我想要做的是将这个加速度计用于图像而不是视图。我怎样才能做到这一点？下面是代码：

#define CONST_fps 100. 
#define CONST_map_shift 0.01 
#define kFilteringFactor 0.1 
UIAccelerationValue rollingX, rollingY, rollingZ; 

@implementation MapViewRotationViewController 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    // accelerometer settings 
    [[UIAccelerometer sharedAccelerometer] setDelegate:self]; 
    [[UIAccelerometer sharedAccelerometer] setUpdateInterval:(1.0/CONST_fps)]; 
} 

- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration 
{ 
    rollingX = (acceleration.x * kFilteringFactor) + (rollingX * (1.0 - kFilteringFactor)); 

    rollingY = (acceleration.y * kFilteringFactor) + (rollingY * (1.0 - kFilteringFactor)); 

    rollingZ = (acceleration.z * kFilteringFactor) + (rollingZ * (1.0 - kFilteringFactor)); 

    float accelX = acceleration.x - rollingX; 
    float accelY = acceleration.y - rollingY; 
    float accelZ = acceleration.z - rollingZ; 

    static CGFloat ZZ = 0.; 
    CGFloat z = (atan2(rollingX, rollingY) + M_PI); 

    if (fabsf(ZZ - z) > CONST_map_shift) 
    { 
     viewToRotate.layer.transform = CATransform3DMakeRotation(ZZ=z, 0., 0., 1.); 
    } 
} 

@end 

Answer 1

你并不需要有一个观点回调，而不是你可以选择任何类，以符合协议UIAccelerometerDelegate。只需要声明你的类在头文件作为

@interface MyClass : NSObject <UIAccelerometerDelegate> { 
    // my members 
} 

在MyClass.m你必须实现方法

- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration { 
    // do what you like 
} 

但是，如果你不被迫支持的iOS 3.x版本，你应该考虑使用CoreMotion API。有关更多信息和示例，请参见Event Handling Guide for iOS/Motion Events。