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copied!<p>You can use the following method from <a href="http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIBezierPath_class/Reference/Reference.html#//apple_ref/occ/cl/UIBezierPath" rel="nofollow"><code>UIBezierPath</code></a>:</p> <pre><code>+ (UIBezierPath *)bezierPathWithCGPath:(CGPathRef)CGPath </code></pre> <p>The reuse of a <code>CGPath</code> is valid. Check this example adding <code>TestView</code> in a <code>UIViewController</code> and linking a <code>UIButton</code> to force the redraw when clicking on it with <code>[_testView setNeedsDisplay]</code>:</p> <pre><code>// TestView.h #import <UIKit/UIKit.h> @interface TestView : UIView { CGMutablePathRef _path; BOOL _nextDraws; } @end // TestView.m #import "TestView.h" @implementation TestView - (void)drawRect:(CGRect)rect { BOOL firstDraw = !_nextDraws; CGContextRef ctx = UIGraphicsGetCurrentContext(); if (firstDraw) { NSLog(@"first draw"); _path = CGPathCreateMutable(); CGPathMoveToPoint(_path, NULL, 0, 0); CGPathAddLineToPoint(_path, NULL, CGRectGetMaxX(rect), CGRectGetMaxY(rect)); CGPathCloseSubpath(_path); CGContextAddPath(ctx, _path); CGContextSetStrokeColorWithColor(ctx,[UIColor whiteColor].CGColor); CGContextStrokePath(ctx); _nextDraws = YES; } else { NSLog(@"next draws"); CGContextRef ctx = UIGraphicsGetCurrentContext(); CGContextClearRect(ctx, rect); UIBezierPath * bezierPath = [UIBezierPath bezierPathWithCGPath:_path]; CGContextAddPath(ctx, bezierPath.CGPath); CGContextSetStrokeColorWithColor(ctx,[UIColor whiteColor].CGColor); CGContextStrokePath(ctx); } } - (void)dealloc { CGPathRelease(_path); [super dealloc]; } @end </code></pre>

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