UIBezierPath 的使用
- // 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]; //设置线条颜色
- UIBezierPath* aPath = [UIBezierPath bezierPath];
- aPath.lineWidth = 5.0;
- aPath.lineCapStyle = kCGLineCapRound; //线条拐角
- aPath.lineJoinStyle = kCGLineCapRound; //终点处理
- // 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];//第五条线通过调用closePath方法得到的
- [aPath stroke];//Draws line 根据坐标点连线
- }
注:这个类要继承自UIView。
- Creates and returns a new UIBezierPath object initialized with a rectangular path.
- + (UIBezierPath *)bezierPathWithRect:(CGRect)rect
demo代码:
- - (void)drawRect:(CGRect)rect
- {
- UIColor *color = [UIColor redColor];
- [color set]; //设置线条颜色
- UIBezierPath* aPath = [UIBezierPath bezierPathWithRect:CGRectMake(20, 20, 100, 50)];
- aPath.lineWidth = 5.0;
- aPath.lineCapStyle = kCGLineCapRound; //线条拐角
- aPath.lineJoinStyle = kCGLineCapRound; //终点处理
- [aPath stroke];
- }
4、使用UIBezierPath创建圆形或者椭圆形
- Creates and returns a new UIBezierPath object initialized with an oval path inscribed in the specified rectangle
- + (UIBezierPath *)bezierPathWithOvalInRect:(CGRect)rect
这个方法根据传入的rect矩形参数绘制一个内切曲线。
- 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]; //设置线条颜色
- 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; //线条拐角
- aPath.lineJoinStyle = kCGLineCapRound; //终点处理
- [aPath stroke];
- }
结果如下图:
- 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]; //设置线条颜色
- UIBezierPath* aPath = [UIBezierPath bezierPath];
- aPath.lineWidth = 5.0;
- aPath.lineCapStyle = kCGLineCapRound; //线条拐角
- aPath.lineJoinStyle = kCGLineCapRound; //终点处理
- [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]; //设置线条颜色
- UIBezierPath* aPath = [UIBezierPath bezierPath];
- aPath.lineWidth = 5.0;
- aPath.lineCapStyle = kCGLineCapRound; //线条拐角
- aPath.lineJoinStyle = kCGLineCapRound; //终点处理
- [aPath moveToPoint:CGPointMake(20, 50)];
- [aPath addCurveToPoint:CGPointMake(200, 50) controlPoint1:CGPointMake(110, 0) controlPoint2:CGPointMake(110, 100)];
- [aPath stroke];
- }
// Create the path data |
CGMutablePathRef cgPath = CGPathCreateMutable(); |
CGPathAddEllipseInRect(cgPath, NULL, CGRectMake(0, 0, 300, 300)); |
CGPathAddEllipseInRect(cgPath, NULL, CGRectMake(50, 50, 200, 200)); |
// Now create the UIBezierPath object |
UIBezierPath* aPath = [UIBezierPath bezierPath]; |
aPath.CGPath = cgPath; |
aPath.usesEvenOddFillRule = YES; |
// After assigning it to the UIBezierPath object, you can release |
// your CGPathRef data type safely. |
CGPathRelease(cgPath); |
Mixing Core Graphics and UIBezierPath
calls
UIBezierPath* aPath = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, 300, 300)]; |
// Get the CGPathRef and create a mutable version. |
CGPathRef cgPath = aPath.CGPath; |
CGMutablePathRef mutablePath = CGPathCreateMutableCopy(cgPath); |
// Modify the path and assign it back to the UIBezierPath object |
CGPathAddEllipseInRect(mutablePath, NULL, CGRectMake(50, 50, 200, 200)); |
aPath.CGPath = mutablePath; |
// Release both the mutable copy of the path. |
CGPathRelease(mutablePath); |
Drawing a path in a view
- (void)drawRect:(CGRect)rect |
{ |
// Create an oval shape to draw. |
UIBezierPath* aPath = [UIBezierPath bezierPathWithOvalInRect: |
CGRectMake(0, 0, 200, 100)]; |
// Set the render colors |
[[UIColor blackColor] setStroke]; |
[[UIColor redColor] setFill]; |
CGContextRef aRef = UIGraphicsGetCurrentContext(); |
// If you have content to draw after the shape, |
// save the current state before changing the transform |
//CGContextSaveGState(aRef); |
// Adjust the view's origin temporarily. The oval is |
// now drawn relative to the new origin point. |
CGContextTranslateCTM(aRef, 50, 50); |
// Adjust the drawing options as needed. |
aPath.lineWidth = 5; |
// Fill the path before stroking it so that the fill |
// color does not obscure the stroked line. |
[aPath fill]; |
[aPath stroke]; |
// Restore the graphics state before drawing any other content. |
//CGContextRestoreGState(aRef); |
} |
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