原文地址
http://www.cnblogs.com/moyunmo/p/3600091.html?utm_source=tuicool&utm_medium=referral
使用UIBezierPath類可以創建基於矢量的路徑,這個類在UIKit中。此類是Core Graphics框架關於path的一個封裝。使用此類可以定義簡單的形狀,如橢圓或者矩形,或者有多個直線和曲線段組成的形狀。
- // Only override drawRect: if you perform custom drawing.
- // An empty implementation adversely affects performance during animation.
- - (void)drawRect:(CGRect)rect
- {
- UIColor *color = [UIColor redColor];
- [color set]; //設置線條顏色
- UIBezierPath* aPath = [UIBezierPath bezierPath];
- aPath.lineWidth = 5.0;
- aPath.lineCapStyle = kCGLineCapRound; //線條拐角
- aPath.lineJoinStyle = kCGLineCapRound; //終點處理
- // Set the starting point of the shape.
- [aPath moveToPoint:CGPointMake(100.0, 0.0)];
- // Draw the lines
- [aPath addLineToPoint:CGPointMake(200.0, 40.0)];
- [aPath addLineToPoint:CGPointMake(160, 140)];
- [aPath addLineToPoint:CGPointMake(40.0, 140)];
- [aPath addLineToPoint:CGPointMake(0.0, 40.0)];
- [aPath closePath];//第五條線通過調用closePath方法得到的
- [aPath stroke];//Draws line 根據座標點連線
- }
- Creates and returns a new UIBezierPath object initialized with a rectangular path.
- + (UIBezierPath *)bezierPathWithRect:(CGRect)rect
demo代碼:
- - (void)drawRect:(CGRect)rect
- {
- UIColor *color = [UIColor redColor];
- [color set]; //設置線條顏色
- UIBezierPath* aPath = [UIBezierPath bezierPathWithRect:CGRectMake(20, 20, 100, 50)];
- aPath.lineWidth = 5.0;
- aPath.lineCapStyle = kCGLineCapRound; //線條拐角
- aPath.lineJoinStyle = kCGLineCapRound; //終點處理
- [aPath stroke];
- }
4、使用UIBezierPath創建圓形或者橢圓形
- Creates and returns a new UIBezierPath object initialized with an oval path inscribed in the specified rectangle
- + (UIBezierPath *)bezierPathWithOvalInRect:(CGRect)rect
這個方法根據傳入的rect矩形參數繪製一個內切曲線。
- Creates and returns a new UIBezierPath object initialized with an arc of a circle.
- + (UIBezierPath *)bezierPathWithArcCenter:(CGPoint)center radius:(CGFloat)radius startAngle:(CGFloat)startAngle endAngle:(CGFloat)endAngle clockwise:(BOOL)clockwise
- Parameters
- center
- Specifies the center point of the circle (in the current coordinate system) used to define the arc.
- radius
- Specifies the radius of the circle used to define the arc.
- startAngle
- Specifies the starting angle of the arc (measured in radians).
- endAngle
- Specifies the end angle of the arc (measured in radians).
- clockwise
- The direction in which to draw the arc.
- Return Value
- A new path object with the specified arc.
- #define pi 3.14159265359
- #define DEGREES_TO_RADIANS(degrees) ((pi * degrees)/ 180)
- - (void)drawRect:(CGRect)rect
- {
- UIColor *color = [UIColor redColor];
- [color set]; //設置線條顏色
- UIBezierPath* aPath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(150, 150)
- radius:75
- startAngle:0
- endAngle:DEGREES_TO_RADIANS(135)
- clockwise:YES];
- aPath.lineWidth = 5.0;
- aPath.lineCapStyle = kCGLineCapRound; //線條拐角
- aPath.lineJoinStyle = kCGLineCapRound; //終點處理
- [aPath stroke];
- }
- Appends a quadratic Bézier curve to the receiver’s path.
- - (void)addQuadCurveToPoint:(CGPoint)endPoint controlPoint:(CGPoint)controlPoint
- Parameters
- endPoint
- The end point of the curve.
- controlPoint
- The control point of the curve.
- - (void)drawRect:(CGRect)rect
- {
- UIColor *color = [UIColor redColor];
- [color set]; //設置線條顏色
- UIBezierPath* aPath = [UIBezierPath bezierPath];
- aPath.lineWidth = 5.0;
- aPath.lineCapStyle = kCGLineCapRound; //線條拐角
- aPath.lineJoinStyle = kCGLineCapRound; //終點處理
- [aPath moveToPoint:CGPointMake(20, 100)];
- [aPath addQuadCurveToPoint:CGPointMake(120, 100) controlPoint:CGPointMake(70, 0)];
- [aPath stroke];
- }
- Appends a cubic Bézier curve to the receiver’s path.
- - (void)addCurveToPoint:(CGPoint)endPoint controlPoint1:(CGPoint)controlPoint1 controlPoint2:(CGPoint)controlPoint2
- Parameters
- endPoint
- The end point of the curve.
- controlPoint1
- The first control point to use when computing the curve.
- controlPoint2
- The second control point to use when computing the curve.
- - (void)drawRect:(CGRect)rect
- {
- UIColor *color = [UIColor redColor];
- [color set]; //設置線條顏色
- UIBezierPath* aPath = [UIBezierPath bezierPath];
- aPath.lineWidth = 5.0;
- aPath.lineCapStyle = kCGLineCapRound; //線條拐角
- aPath.lineJoinStyle = kCGLineCapRound; //終點處理
- [aPath moveToPoint:CGPointMake(20, 50)];
- [aPath addCurveToPoint:CGPointMake(200, 50) controlPoint1:CGPointMake(110, 0) controlPoint2:CGPointMake(110, 100)];
- [aPath stroke];
- }
// Create the path data
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CGMutablePathRef cgPath = CGPathCreateMutable();
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CGPathAddEllipseInRect(cgPath, NULL, CGRectMake(0, 0, 300, 300));
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CGPathAddEllipseInRect(cgPath, NULL, CGRectMake(50, 50, 200, 200));
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// Now create the UIBezierPath object
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UIBezierPath* aPath = [UIBezierPath bezierPath];
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aPath.CGPath = cgPath;
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aPath.usesEvenOddFillRule = YES;
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// After assigning it to the UIBezierPath object, you can release
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// your CGPathRef data type safely.
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CGPathRelease(cgPath);
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Mixing Core Graphics and UIBezierPath
calls
UIBezierPath* aPath = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, 300, 300)];
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// Get the CGPathRef and create a mutable version.
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CGPathRef cgPath = aPath.CGPath;
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CGMutablePathRef mutablePath = CGPathCreateMutableCopy(cgPath);
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// Modify the path and assign it back to the UIBezierPath object
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CGPathAddEllipseInRect(mutablePath, NULL, CGRectMake(50, 50, 200, 200));
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aPath.CGPath = mutablePath;
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// Release both the mutable copy of the path.
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CGPathRelease(mutablePath);
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Drawing a path in a view
- (void)drawRect:(CGRect)rect
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{
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// Create an oval shape to draw.
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UIBezierPath* aPath = [UIBezierPath bezierPathWithOvalInRect:
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CGRectMake(0, 0, 200, 100)];
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// Set the render colors
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[[UIColor blackColor] setStroke];
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[[UIColor redColor] setFill];
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CGContextRef aRef = UIGraphicsGetCurrentContext();
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// If you have content to draw after the shape,
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// save the current state before changing the transform
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//CGContextSaveGState(aRef);
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// Adjust the view's origin temporarily. The oval is
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// now drawn relative to the new origin point.
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CGContextTranslateCTM(aRef, 50, 50);
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// Adjust the drawing options as needed.
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aPath.lineWidth = 5;
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// Fill the path before stroking it so that the fill
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// color does not obscure the stroked line.
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[aPath fill];
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[aPath stroke];
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// Restore the graphics state before drawing any other content.
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//CGContextRestoreGState(aRef);
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}
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