【转载】iPhone开发论坛madhomeshake摇动侦测

本文转载子iPhone手机开发者论坛www.madhome.org

说明&＃xff1a;示范抓取加速计的资料来判断iPhone的Shake摇动动作

示范


摇晃前的预设文字&＃xff1a;没事


用力摇晃后画面将显示为&＃xff1a;摇动

程式码&＃xff1a;

#import "AccelerometerDemoViewController.h"

&＃64;implementation AccelerometerDemoViewController

&＃64;synthesize mylabel;

- (void)viewDidLoad {
        UIAccelerometer *accelerometer &＃61; [UIAccelerometer sharedAccelerometer];
        accelerometer.delegate &＃61; self;
        accelerometer.updateInterval &＃61;  1.0f/60.0f;
    [super viewDidLoad];        
}

- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration{
        
        static NSInteger shakeCount&＃61;0;
        static NSDate *shakeStart;
        
        NSDate *now&＃61;[[NSDate alloc] init];
        //搖晃時間在&＃xff12;秒內
        NSDate *checkDate&＃61;[[NSDate alloc] initWithTimeInterval:2.0f sinceDate:shakeStart];
        
        //超過&＃xff12;秒則重新計算搖晃次數
        if ([now compare:checkDate]&＃61;&＃61;NSOrderedDescending||shakeStart&＃61;&＃61;nil){
                shakeCount&＃61;0;
                [shakeStart release];
                shakeStart&＃61;[[NSDate alloc] init];                                
        }
        
        [now release];
        [checkDate release];
        
        //三軸搖晃的G力超過&＃xff12;則列入計次
        if (fabsf(acceleration.x)>2.0 || fabsf(acceleration.y)>2.0|| fabsf(acceleration.z)>2.0){
                shakeCount&＃43;&＃43;;
                
                //&＃xff12;秒內偵測到&＃xff14;次則判定為Shake搖晃手機
                if (shakeCount>4){
                        shakeCount&＃61;0;
                        [shakeStart release];
                        shakeStart&＃61;[[NSDate alloc] init];
                        
                        //畫面顯示搖動文字
                        mylabel.text&＃61;&＃64;"搖動";
                        
        //設定&＃xff12;秒後自動還原                
        [NSTimer scheduledTimerWithTimeInterval:2.0f target:self selector:&＃64;selector(cleartext) userInfo:nil repeats:NO];
                }
        }
}                
                        
-(void)cleartext{
        //預設文字
        mylabel.text&＃61;&＃64;"沒事";
}


此范例的应用相当的广泛而有趣&＃xff0c;早期App Store上的创意软体如花女棒、打火机及蜡烛等软体都是利用相同的原理实作的喔&＃xff0c;看看您是否也能想出更好的创意。

附件下载地址&＃xff1a;iPhone手机开发者论坛http://www.madhome.org/