CGPath CGContext UIBezierPath的比较

//

//PathView.m

//CocoTest_1

//

//Created by S u p e r m a n on 2017/3/14.

//Copyright © 2017年张浩. All rights reserved.

//

#import"PathView.h"

@implementationPathView

- (instancetype)initWithFrame:(CGRect)frame {

if(self= [superinitWithFrame:frame]) {

self.backgroundColor = [UIColor blueColor];

}

returnself;

}

- (void)drawRect:(CGRect)rect {

[selfCGPath];

[selfCGContext];

[selfbezier];

[selfdrawRound];

}

/*

*一：CGPath

**/

- (void)CGPath {

CGContextRef ref = UIGraphicsGetCurrentContext();

CGMutablePathRef pathRef = CGPathCreateMutable();

//1.设置起点

CGPathMoveToPoint(pathRef,nil,5,5);

//2.加入线

CGPathAddLineToPoint(pathRef,nil,50,50);

//3.把path放到contextRef中

CGContextAddPath(ref, pathRef);

CGPathRelease(pathRef);

[[UIColor redColor]setStroke];

//CGContextSetStrokeColorWithColor(ref, [UIColor redColor].CGColor);

/*

*这句话必须加上去否则不会开始绘制

*这句话是开始绘制CGPath路径

**/

CGContextStrokePath(ref);

}

/*

*二：直接用CGContext绘制

**/

- (void)CGContext {

CGContextRef ref = UIGraphicsGetCurrentContext();

CGContextMoveToPoint(ref,50,50);

CGContextAddLineToPoint(ref,100,100);

CGContextAddLineToPoint(ref,10,60);

CGContextSetLineWidth(ref,5);

CGContextSetLineCap(ref, kCGLineCapRound);

CGContextSetLineJoin(ref, kCGLineJoinBevel);

[[UIColor yellowColor]setFill];

[[UIColor cyanColor]setStroke];

/*

* 3种方法绘制path

* 1.CGContextFillPath(ref);绘制填充

* 2.CGContextStrokePath(ref);绘制笔触

* 3.CGContextDrawPath(ref, kCGPathFillStroke);绘制填充和笔触

**/

CGContextDrawPath(ref, kCGPathFillStroke);

}

/*

*贝塞尔曲线

**/

- (void)bezier {

UIBezierPath * path = [UIBezierPath bezierPath];

[path moveToPoint:CGPointMake(100,100)];

[path addLineToPoint:CGPointMake(200,100)];

[path addLineToPoint:CGPointMake(150,200)];

[path setLineCapStyle:kCGLineCapRound];

[path setLineJoinStyle:kCGLineJoinBevel];

[path setLineWidth:5];

[[UIColor redColor]setFill];

[[UIColor yellowColor]setStroke];

[path stroke];

[path fill];

[path closePath];

}

/*

*贝塞尔曲线绘制圆，椭圆，扇形

**/

- (void)drawRound {

//绘制圆

UIBezierPath * path = [UIBezierPath bezierPath];

[path addArcWithCenter:CGPointMake(100,100) radius:50startAngle:0endAngle:M_PI*1.5clockwise:YES];

[path setLineWidth:10];

[[UIColor yellowColor]setStroke];

[path stroke];

//绘制椭圆

UIBezierPath * path1 = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0,0,100,200)];

[path1 setLineWidth:5];

[path1 stroke];

}

@end