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【ObjC】识别设备摇晃事件

作者:宝清 / 发布于2014/11/17/ 351

识别iOS设备的摇晃（Shake）手势。


	// 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
	
	@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. DO HERE WHAT YOU WANT. */
	
	 } else if (histeresisExcited && !L0AccelerationIsShaking(self.lastAcceleration, acceleration, 0.2)) {
	 histeresisExcited = NO;
	 }
	 }
	
	 self.lastAcceleration = acceleration;
	}
	
	// and proper @synthesize and -dealloc boilerplate code
	
	@end

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