使用CPBPressureTouchGestureRecognizer轻敲压力强度检测

它与一个UIButton很好地工作：

– (void) viewDidLoad { [super viewDidLoad]; CPBPressureTouchGestureRecognizer* recognizer = [[CPBPressureTouchGestureRecognizer alloc] initWithTarget:self action:@selector(A_button:)]; [A_button addGestureRecognizer: recognizer]; [recognizer release]; } - (void) A_button: (CPBPressureTouchGestureRecognizer*) recognizer { [pan_A setGain:recognizer.pressure]; [pan_A] play; } 

我试图使用更多，但只有第二个工作：

 - (void) viewDidLoad { [super viewDidLoad]; CPBPressureTouchGestureRecognizer* recognizer1 = [[CPBPressureTouchGestureRecognizer alloc] initWithTarget:self action:@selector(A_button:)]; [A_button addGestureRecognizer: recognizer1]; CPBPressureTouchGestureRecognizer* recognizer2 = [[CPBPressureTouchGestureRecognizer alloc] initWithTarget:self action:@selector(B_button:)]; [B_button addGestureRecognizer: recognizer1]; [recognizer1 release]; [recognizer2 release]; } - (void) A_button: (CPBPressureTouchGestureRecognizer*) recognizer1 { [pan_A setGain:recognizer1.pressure]; [pan_A] play; } - (void) B_button: (CPBPressureTouchGestureRecognizer*) recognizer1 { [pan_B setGain:recognizer2.pressure]; [pan_B] play; } 

我怎么能得到这两个工作？

Answer 1

CPBPressureTouchGestureRecognizer仅支持UIAccelerometer的委托模型自身的一个实例。 这是一个支持多个实例的更好的版本。

 // CPBPressureTouchGestureRecognizer.h // PressureSensitiveButton #import <UIKit/UIKit.h> #define CPBPressureNone 0.0f #define CPBPressureLight 0.3f #define CPBPressureMedium 0.4f #define CPBPressureHard 0.6f #define CPBPressureInfinite 2.0f @interface CPBPressureTouchGestureRecognizer : UIGestureRecognizer { @public float pressure; float minimumPressureRequired; float maximumPressureRequired; @private float pressureValues[50]; uint currentPressureValueIndex; uint setNextPressureValue; } @property (readonly, assign) float pressure; @property (readwrite, assign) float minimumPressureRequired; @property (readwrite, assign) float maximumPressureRequired; @end // CPBPressureTouchGestureRecognizer.m #import <UIKit/UIGestureRecognizerSubclass.h> #import "CPBPressureTouchGestureRecognizer.h" #import "CPBAcceleromterDelegate.h" #define kUpdateFrequency 60.0f #define KNumberOfPressureSamples 3 @interface CPBPressureTouchGestureRecognizer (private) - (void)setup; @end @implementation CPBPressureTouchGestureRecognizer @synthesize pressure, minimumPressureRequired, maximumPressureRequired; - (id)initWithTarget:(id)target action:(SEL)action { self = [super initWithTarget:target action:action]; if (self != nil) { [self setup]; } return self; } - (id)init { self = [super init]; if (self != nil) { [self setup]; } return self; } - (void)dealloc { [[NSNotificationCenter defaultCenter] removeObserver:self]; [super dealloc]; } - (void)setup { minimumPressureRequired = CPBPressureNone; maximumPressureRequired = CPBPressureInfinite; pressure = CPBPressureNone; [[UIAccelerometer sharedAccelerometer] setUpdateInterval:0.001f / kUpdateFrequency]; [[UIAccelerometer sharedAccelerometer] setDelegate:[CPBAcceleromterDelegate sharedCPBAcceleromterDelegate]]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(accelerateNotification:) name:CPB_ACCELERATION_EVENT object:nil]; } #pragma - #pragma UIAccelerometerDelegate methods - (void)accelerateNotification:(NSNotification *)notification { UIAcceleration *acceleration = [[CPBAcceleromterDelegate sharedCPBAcceleromterDelegate] acceleration]; int sz = (sizeof pressureValues) / (sizeof pressureValues[0]); // set current pressure value pressureValues[currentPressureValueIndex%sz] = acceleration.z; if (setNextPressureValue > 0) { // calculate average pressure float total = 0.0f; for (int loop=0; loop<sz; loop++) total += pressureValues[loop]; float average = total / sz; // start with most recent past pressure sample if (setNextPressureValue == KNumberOfPressureSamples) { float mostRecent = pressureValues[(currentPressureValueIndex-1)%sz]; pressure = fabsf(average - mostRecent); } // caluculate pressure as difference between average and current acceleration float diff = fabsf(average - acceleration.z); if (pressure < diff) pressure = diff; setNextPressureValue--; if (setNextPressureValue == 0) { if (pressure >= minimumPressureRequired && pressure <= maximumPressureRequired) self.state = UIGestureRecognizerStateRecognized; else self.state = UIGestureRecognizerStateFailed; } } currentPressureValueIndex++; } #pragma - #pragma UIGestureRecognizer subclass methods - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { setNextPressureValue = KNumberOfPressureSamples; self.state = UIGestureRecognizerStatePossible; } - (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event { self.state = UIGestureRecognizerStateFailed; } - (void)reset { pressure = CPBPressureNone; setNextPressureValue = 0; currentPressureValueIndex = 0; } @end // // CPBAcceleromterDelegate.h // iPan // // Created by Anthony Picciano on 1/25/12. // Copyright (c) 2012 Crispin Porter + Bogusky. All rights reserved. // #import <Foundation/Foundation.h> #define CPB_ACCELERATION_EVENT @"accellerationEvent" @interface CPBAcceleromterDelegate : NSObject <UIAccelerometerDelegate> @property (nonatomic, retain) UIAcceleration *acceleration; + (CPBAcceleromterDelegate *)sharedCPBAcceleromterDelegate; -(void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration; @end // // CPBAcceleromterDelegate.m // iPan // // Created by Anthony Picciano on 1/25/12. // Copyright (c) 2012 Crispin Porter + Bogusky. All rights reserved. // #import "CPBAcceleromterDelegate.h" #include "SynthesizeSingleton.h" @implementation CPBAcceleromterDelegate @synthesize acceleration; SYNTHESIZE_SINGLETON_FOR_CLASS(CPBAcceleromterDelegate) -(void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)newAcceleration { self.acceleration = newAcceleration; [[NSNotificationCenter defaultCenter] postNotificationName:CPB_ACCELERATION_EVENT object:self]; } @end // // SynthesizeSingleton.h // CocoaWithLove // // Created by Matt Gallagher on 20/10/08. // Copyright 2009 Matt Gallagher. All rights reserved. // http://cocoawithlove.com/2008/11/singletons-appdelegates-and-top-level.html // // Permission is given to use this source code file without charge in any // project, commercial or otherwise, entirely at your risk, with the condition // that any redistribution (in part or whole) of source code must retain // this copyright and permission notice. Attribution in compiled projects is // appreciated but not required. // #define SYNTHESIZE_SINGLETON_FOR_CLASS(classname) \ \ static classname *shared##classname = nil; \ \ + (classname *)shared##classname \ { \ @synchronized(self) \ { \ if (shared##classname == nil) \ { \ shared##classname = [[self alloc] init]; \ } \ } \ \ return shared##classname; \ } \ \ + (id)allocWithZone:(NSZone *)zone \ { \ @synchronized(self) \ { \ if (shared##classname == nil) \ { \ shared##classname = [super allocWithZone:zone]; \ return shared##classname; \ } \ } \ \ return nil; \ } \ \ - (id)copyWithZone:(NSZone *)zone \ { \ return self; \ } \ \ - (id)retain \ { \ return self; \ } \ \ - (NSUInteger)retainCount \ { \ return NSUIntegerMax; \ } \ \ - (void)release \ { \ } \ \ - (id)autorelease \ { \ return self; \ } 

Answer 2

看到下面这行： [B_button addGestureRecognizer: recognizer1]; ？

您添加recognizer1而不是recognizer2 ，因此不使用recognizer2器2;