我找到了一个对我的游戏有用的小教程：
http://blog.mellenthin.de/archives/2012/02/13/an-one-finger-rotation-gesture-recognizer/
但是我不知道如何将该手势转换为与 cocos2d 一起使用，我在 cocos2d 中找到了预制手势的示例，但没有自定义手势，这可能吗？
编辑仍然有这个问题：
我在下面添加了来自 Sentinel 的代码，Gesture 和 RotateGesture 都已添加到我的解决方案中并正在编译。虽然现在在轮换类中我只看到选择器，但我该如何设置它们？由于在上面那个项目中找到的自定义手势如下所示：
自定义手势的头文件：
#import <Foundation/Foundation.h>
#import <UIKit/UIGestureRecognizerSubclass.h>
@protocol OneFingerRotationGestureRecognizerDelegate <NSObject>
@optional
- (void) rotation: (CGFloat) angle;
- (void) finalAngle: (CGFloat) angle;
@end
@interface OneFingerRotationGestureRecognizer : UIGestureRecognizer
{
CGPoint midPoint;
CGFloat innerRadius;
CGFloat outerRadius;
CGFloat cumulatedAngle;
id <OneFingerRotationGestureRecognizerDelegate> target;
}
- (id) initWithMidPoint: (CGPoint) midPoint
innerRadius: (CGFloat) innerRadius
outerRadius: (CGFloat) outerRadius
target: (id) target;
- (void)reset;
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event;
@end
.m 用于自定义手势文件：
#include <math.h>
#import "OneFingerRotationGestureRecognizer.h"
@implementation OneFingerRotationGestureRecognizer
// private helper functions
CGFloat distanceBetweenPoints(CGPoint point1, CGPoint point2);
CGFloat angleBetweenLinesInDegrees(CGPoint beginLineA,
CGPoint endLineA,
CGPoint beginLineB,
CGPoint endLineB);
- (id) initWithMidPoint: (CGPoint) _midPoint
innerRadius: (CGFloat) _innerRadius
outerRadius: (CGFloat) _outerRadius
target: (id <OneFingerRotationGestureRecognizerDelegate>) _target
{
if ((self = [super initWithTarget: _target action: nil]))
{
midPoint = _midPoint;
innerRadius = _innerRadius;
outerRadius = _outerRadius;
target = _target;
}
return self;
}
/** Calculates the distance between point1 and point 2. */
CGFloat distanceBetweenPoints(CGPoint point1, CGPoint point2)
{
CGFloat dx = point1.x - point2.x;
CGFloat dy = point1.y - point2.y;
return sqrt(dx*dx + dy*dy);
}
CGFloat angleBetweenLinesInDegrees(CGPoint beginLineA,
CGPoint endLineA,
CGPoint beginLineB,
CGPoint endLineB)
{
CGFloat a = endLineA.x - beginLineA.x;
CGFloat b = endLineA.y - beginLineA.y;
CGFloat c = endLineB.x - beginLineB.x;
CGFloat d = endLineB.y - beginLineB.y;
CGFloat atanA = atan2(a, b);
CGFloat atanB = atan2(c, d);
// convert radiants to degrees
return (atanA - atanB) * 180 / M_PI;
}
#pragma mark - UIGestureRecognizer implementation
- (void)reset
{
[super reset];
cumulatedAngle = 0;
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[super touchesBegan:touches withEvent:event];
if ([touches count] != 1)
{
self.state = UIGestureRecognizerStateFailed;
return;
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
[super touchesMoved:touches withEvent:event];
if (self.state == UIGestureRecognizerStateFailed) return;
CGPoint nowPoint = [[touches anyObject] locationInView: self.view];
CGPoint prevPoint = [[touches anyObject] previousLocationInView: self.view];
// make sure the new point is within the area
CGFloat distance = distanceBetweenPoints(midPoint, nowPoint);
if ( innerRadius <= distance
&& distance <= outerRadius)
{
// calculate rotation angle between two points
CGFloat angle = angleBetweenLinesInDegrees(midPoint, prevPoint, midPoint, nowPoint);
// fix value, if the 12 o'clock position is between prevPoint and nowPoint
if (angle > 180)
{
angle -= 360;
}
else if (angle < -180)
{
angle += 360;
}
// sum up single steps
cumulatedAngle += angle;
// call delegate
if ([target respondsToSelector: @selector(rotation:)])
{
[target rotation:angle];
}
}
else
{
// finger moved outside the area
self.state = UIGestureRecognizerStateFailed;
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
[super touchesEnded:touches withEvent:event];
if (self.state == UIGestureRecognizerStatePossible)
{
self.state = UIGestureRecognizerStateRecognized;
if ([target respondsToSelector: @selector(finalAngle:)])
{
[target finalAngle:cumulatedAngle];
}
}
else
{
self.state = UIGestureRecognizerStateFailed;
}
cumulatedAngle = 0;
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
[super touchesCancelled:touches withEvent:event];
self.state = UIGestureRecognizerStateFailed;
cumulatedAngle = 0;
}
@end
然后它的初始化如下：
// calculate center and radius of the control
CGPoint midPoint = CGPointMake(image.frame.origin.x + image.frame.size.width / 2,
image.frame.origin.y + image.frame.size.height / 2);
CGFloat outRadius = image.frame.size.width / 2;
// outRadius / 3 is arbitrary, just choose something >> 0 to avoid strange
// effects when touching the control near of it's center
gestureRecognizer = [[OneFingerRotationGestureRecognizer alloc] initWithMidPoint: midPoint
innerRadius: outRadius / 3
outerRadius: outRadius
target: self];
[self.view addGestureRecognizer: gestureRecognizer];
下面的选择器也在同一文件中，其中初始化了gestureRecogonizer：
- (void) rotation: (CGFloat) angle
{
// calculate rotation angle
imageAngle += angle;
if (imageAngle > 360)
imageAngle -= 360;
else if (imageAngle < -360)
imageAngle += 360;
// rotate image and update text field
image.transform = CGAffineTransformMakeRotation(imageAngle * M_PI / 180);
[self updateTextDisplay];
}
我似乎无法在 RotateGesture 课程中使用它，任何人都可以帮助我，我已经坚持了好几天了。