objective-c – 加速度计和校准 – iPhone SDK

概述我需要在我的 iphone游戏中使用加速度计的功能.我只需要通过倾斜设备来移动图像.然而,youtube上的大多数视频只显示倾斜功能,以某种方式反转,忘记包括校准.我希望用户将他们的设备校准到他们所处的位置.有谁知道我应该如何开始这个？ 非常感谢您的帮助, 凯文 我曾经做过这样的应用程序. 我会在这里发布,但它适用于iOS 4 … http://localhostr.com/files/7ca39 我需要在我的 iphone游戏中使用加速度计的功能.我只需要通过倾斜设备来移动图像.然而,youtube上的大多数视频只显示倾斜功能,以某种方式反转,忘记包括校准.我希望用户将他们的设备校准到他们所处的位置.有谁知道我应该如何开始这个？

非常感谢您的帮助,

凯文

解决方法 我曾经做过这样的应用程序.
我会在这里发布,但它适用于iOS 4 …

http://localhostr.com/files/7ca39c/Tilter.zip

校准：

int tapCount = 0;- (voID)cancelDoubleTap {    if (tapCount < 2) {        tapCount = 0;    }}- (voID)reset {    [[NSUserDefaults standardUserDefaults] setfloat:0 forKey:@"X-Calibrate"];    [[NSUserDefaults standardUserDefaults] setfloat:0 forKey:@"Y-Calibrate"];    UIAlertVIEw *alert = [[UIAlertVIEw alloc] initWithTitle:@"reset!" message:@"Calibration reset." delegate:nil cancelbuttonTitle:@"Okay." otherbuttonTitles:nil];    [alert show];    [alert release];}- (voID)calibrate {    if (tapCount == 3) {        tapCount = 0;        return;    }    [[NSUserDefaults standardUserDefaults] setfloat:accelX forKey:@"X-Calibrate"];    [[NSUserDefaults standardUserDefaults] setfloat:accelY forKey:@"Y-Calibrate"];    UIAlertVIEw *alert = [[UIAlertVIEw alloc] initWithTitle:@"Calibrated!" message:[Nsstring stringWithFormat:@"Calibrated to: %.2f %.2f.",accelX,accelY] delegate:nil cancelbuttonTitle:@"Okay." otherbuttonTitles:nil];    [alert show];    [alert release];    tapCount = 0;}- (BOol)canBecomeFirstResponder {    return YES;}- (voID)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {    NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(cancelDoubleTap) userInfo:nil repeats:NO];    tapCount ++;    if (tapCount == 3) {        [timer invalIDate];        [self reset];        return;    }    if (tapCount == 2) {        [timer invalIDate];        timer = [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(calibrate) userInfo:nil repeats:NO];    }  }

和…

- (BOol)application:(UIApplication *)application dIDFinishLaunchingWithOptions:(NSDictionary *)launchOptions {     but = [[UIbutton alloc] initWithFrame:window.frame];    [but addTarget:self action:@selector(touchesEnded:withEvent:) forControlEvents:UIControlEventtouchUpInsIDe];    [window addSubvIEw:but];     // OverrIDe point for customization after application launch.    Box = [[UIVIEw alloc] initWithFrame:CGRectMake(self.window.center.x - 50,self.window.center.y - 50,100,100)];  [window makeKeyAndVisible];    Box.backgroundcolor = [UIcolor colorWithRed:1.0 green:0.0 blue:0.0 Alpha:0.75];    [window addSubvIEw:Box];    [[UIAccelerometer sharedAccelerometer] setDelegate:self];    [[UIAccelerometer sharedAccelerometer] setUpdateInterval:(1/100.0)];    slIDer = [[UiSlider alloc] initWithFrame:CGRectMake(20,438,280,22)];    [slIDer setMinimumValue:2.0];    [slIDer setMaximumValue:50.0];    [window addSubvIEw:slIDer];    return YES; }

.h文件：

#import <UIKit/UIKit.h>@interface TilterappDelegate : NSObject <UIApplicationDelegate,UIAccelerometerDelegate> {    UIWindow *window;    UIVIEw *Box;    UiSlider *slIDer;    UIbutton *but;}@property (nonatomic,retain) IBOutlet UIbutton *but;@property (nonatomic,retain) IBOutlet UiSlider *slIDer;@property (nonatomic,retain) IBOutlet UIVIEw *Box;@property (nonatomic,retain) IBOutlet UIWindow *window;@end

移动代码：

- (voID)moveBoxByX:(float)x byY:(float)y {    float newX = Box.center.x + x;    float newY = Box.center.y + y;    if (newX < 50)        newX = 50;    if (newX > 270)        newX = 270;    if (newY < 50)        newY = 50;    if (newY > 430)        newY = 430;    Box.center = CGPointMake(newX,newY);}

应该在大多数时间工作.

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