如何在iOS中实现轰轰烈烈的摇摆？ [英] How to achieve vigorous Shake in iOS?

问题描述

我在ios中使用Shake Feature。它的工作正常，下面的代码。但当我进行剧烈摇晃时，它会发现震动并且在一秒钟内它会调用此行 if（histeresisExcited&&！L0AccelerationIsShaking（self.lastAcceleration，acceleration，0.2））{
histeresisExcited = NO;} 虽然我继续摇晃。

I am using Shake Feature in ios. Its working fine with the below code. But when i go for vigorous shake, it detected the shaking and with in a second it calls this line if (histeresisExcited && !L0AccelerationIsShaking(self.lastAcceleration, acceleration, 0.2)) { histeresisExcited = NO;} though i keep on shaking.

如何实现剧烈震动？

我在这里做错了什么？

What i am doing wrong here?

// Ensures the shake is strong enough on at least two axes before declaring it a shake.
// "Strong enough" means "greater than a client-supplied threshold" in G's.
static BOOL L0AccelerationIsShaking(UIAcceleration* last, UIAcceleration* current, double threshold) {
    double
            deltaX = fabs(last.x - current.x),
            deltaY = fabs(last.y - current.y),
            deltaZ = fabs(last.z - current.z);

    return
            (deltaX > threshold && deltaY > threshold) ||
            (deltaX > threshold && deltaZ > threshold) ||
            (deltaY > threshold && deltaZ > threshold);
}

@interface L0AppDelegate : NSObject <UIApplicationDelegate> {
    BOOL histeresisExcited;
    UIAcceleration* lastAcceleration;
}

@property(retain) UIAcceleration* lastAcceleration;

@end

实施

@implementation L0AppDelegate

- (void)applicationDidFinishLaunching:(UIApplication *)application {
     [UIAccelerometer sharedAccelerometer].delegate = self;
}

- (void) accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {

    if (self.lastAcceleration) {
            if (!histeresisExcited && L0AccelerationIsShaking(self.lastAcceleration, acceleration, 0.7)) {
                    histeresisExcited = YES;

                    /* SHAKE DETECTED. DOING SOME DATABASE OPERATIONS HERE. */

            } else if (histeresisExcited && !L0AccelerationIsShaking(self.lastAcceleration, acceleration, 0.2)) {
                    histeresisExcited = NO;

                 /* SHAKE STOPPED. CALLING A VIEW CONTROLLER TO DISPLAY THE CONTENTS GOT FROM THE DATABASE*/
            }
    }

    self.lastAcceleration = acceleration;
 }

// and proper @synthesize and -dealloc boilerplate code

 @end

感谢您的帮助。

推荐答案

最后通过一点改变得到答案在我的代码中

Finally got the answer by little change in my code

更改以下代码

static BOOL L0AccelerationIsShaking(UIAcceleration* last, UIAcceleration* current, double threshold) {
double
        deltaX = fabs(last.x - current.x),
        deltaY = fabs(last.y - current.y),
        deltaZ = fabs(last.z - current.z);

return
        (deltaX > threshold && deltaY > threshold) ||
        (deltaX > threshold && deltaZ > threshold) ||
        (deltaY > threshold && deltaZ > threshold);

}

到

static BOOL L0AccelerationIsShaking(UIAcceleration* last, UIAcceleration* current, double threshold) {
double
        deltaX = fabs(last.x - current.x),
        deltaY = fabs(last.y - current.y),
        deltaZ = fabs(last.z - current.z);

return
        (deltaX > threshold) ||
        (deltaY > threshold) ||
        (deltaZ > threshold);

}

像Charm一样工作。

Works Like Charm.

希望它对像我这样的人有所帮助。

Hope it will help for some one like me.

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