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    <p>If you want to stay in objective-c, you can use UIBezierPath's addCurveToPoint:controlPoint1:controlPoint2: method. You can also use a similarly named function with CGPaths. When using bezier curves, you need 4 points: starting point, ending point, and a control point at each end to define the curve.</p> <p>One way to define this is to have the user drag a finger to define the start and end points, then tap the screen at the control points. Here is an example view to handle this.</p> <p>BezierView.h</p> <pre><code>enum { BezierStateNone = 0, BezierStateDefiningLine, BezierStateDefiningCP1, BezierStateDefiningCP2 }; @interface BezierView : UIView { CGPoint startPt, endPt, cPt1, cPt2; UInt8 state; UIBezierPath *curvePath; @private UITouch *currentTouch; } @property (nonatomic, retain) UIBezierPath *curvePath; @end </code></pre> <p>BezierView.m</p> <pre><code>@interface BezierView @dynamic curvePath; - (UIBezierPath *)curvePath { return [[curvePath retain] autorelease]; } - (void)setCurvePath:(UIBezierPath *)newPath { id tmp = curvePath; curvePath = [newPath retain]; [tmp release]; state = BezierStateNone; [self setNeedsDisplay]; } - (void)_updateCurve { UIBezierPath *path = [UIBezierPath bezierPath]; [path moveToPoint:startPt]; [path addCurveToPoint:endPt controlPoint1:cPt1 controlPoint2:cPt2]; } - (void)_calcDefaultControls { if(ABS(startPt.x - endPt.x) &gt; ABS(startPt.y - endPt.y)) { cPt1 = (CGPoint){(startPt.x + endPt.x) / 2, startPt.y}; cPt2 = (CGPoint){cPt1.x, endPt.y}; } else { cPt1 = (CGPoint){startPt.x, (startPt.y + endPt.y) / 2}; cPt2 = (CGPoint){endPt.x, cPt1.y}; } } - (void)drawRect:(CGRect)rect { UIBezierPath *path = self.curvePath; if(path) [path stroke]; } - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { if(currentTouch) return; if(state == BezierStateNone) { state = BezierStateDefiningLine; currentTouch = [touches anyObject]; startPt = [currentTouch locationInView:self]; } else if(state == BezierStateDefiningCP1) { currentTouch = [touches anyObject]; cPt1 = [currentTouch locationInView:self]; [self _updateCurve]; } else if(state == BezierStateDefiningCP2) { currentTouch = [touches anyObject]; cPt2 = [currentTouch locationInView:self]; [self _updateCurve]; } } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { if(!currentTouch) return; if(state == BezierStateDefiningLine) { endPt = [currentTouch locationInView:self]; [self _calcDefaultControls]; [self _updateCurve]; } else if(state == BezierStateDefiningCP1) { cPt1 = [currentTouch locationInView:self]; [self _updateCurve]; } else if(state == BezierStateDefiningCP2) { cPt2 = [currentTouch locationInView:self]; [self _updateCurve]; } } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { if(!currentTouch) return; if(state == BezierStateDefiningLine) { state = BezierStateDefiningCP1; } else if(state == BezierStateDefiningCP1) { state = BezierStateDefiningCP2; } else if(state == BezierStateDefiningCP2) { state = BezierStateNone; } currentTouch = nil; } - (void)touchesCanceled:(NSSet *)touches withEvent:(UIEvent *)event { if(state == BezierStateDefiningLine) { self.curvePath = nil; self.state = BezierStateNone; } self.currentTouch = nil; } </code></pre>
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