建立自定義的旋轉手勢

主要重寫了4個方法：

- (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

@protocol cayswirlgesturerecognizerdelegate @end

@inte***ce cayswirlgesturerecognizer : uigesturerecognizer
@property cgfloat currentangle;
@property cgfloat previousangle;
@end
#import "cayswirlgesturerecognizer.h"
@inte***ce cayswirlgesturerecognizer ()
@property (strong, nonatomic) id target;
@property (nonatomic) sel action;
@end
@implementation cayswirlgesturerecognizer
- (id)initwithtarget:(id)target action:(sel)action 
return self;
}- (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 
- (float)gettouchangle:(cgpoint)touch 
else 
}float arctan = atanf(x/y);
// figure out which quadrant we're in
// quadrant i 第一象限
if ((x >= 0) && (y > 0)) 
// quadrant ii 第二象限
else if ((x < 0) && (y > 0)) 
// quadrant iii
else if ((x <= 0) && (y < 0)) 
// quadrant iv
else if ((x > 0) && (y < 0)) 
return -1;
}@end

self.swirlgesturerecognizer = [[cayswirlgesturerecognizer alloc] initwithtarget:self action:@selector(rotationaction:)];

[self.swirlgesturerecognizer setdelegate:self];
[self.controlsview addgesturerecognizer:self.swirlgesturerecognizer];

- (void)rotationaction:(id)sender 

cgfloat direction = ((cayswirlgesturerecognizer*)sender).currentangle - ((cayswirlgesturerecognizer*)sender).previousangle;
bearing += 180 * direction / m_pi;
if (bearing < -0.5) 
else if (bearing > 359.5) 
cgaffinetransform knobtransform = self.knob.transform;
cgaffinetransform newknobtransform = cgaffinetransformrotate(knobtransform, direction);
[self.knob settransform:newknobtransform];
self.position.text = [nsstring stringwithformat:@"%dº", (int)lroundf(bearing)];
}

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