CGPath CGContext UIBezierPath的比较

////  PathView.m//  Qauze////  Created by apple on 16/6/2.//  Copyright © 2016年 李重阳. All rights reserved.//#import "PathView.h"@implementation PathView- (instancetype)initWithFrame:(CGRect)frame {    if (self = [super initWithFrame:frame]) {        self.backgroundColor = [UIColor blueColor];    }    return self;}- (void)drawRect:(CGRect)rect {    [self CGPath];    [self CGContext];    [self bezier];    [self drawRound];}/* *  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:50 startAngle:0 endAngle:M_PI*1.5 clockwise: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