UIBezierPath介绍

前言

UIBezierPath是UIKit中的一个关于图形绘制的类，是通过Quartz 2D也就是CG（Core Graphics）CGPathRef的封装得到的，从高级特性支持来看不及CG。

UIBezierPath类可以绘制矩形、圆形、直线、曲线以及它们的组合图形。

UIBezierPath对象

对象创建方法

// 创建基本路径+ (instancetype)bezierPath;// 创建矩形路径+ (instancetype)bezierPathWithRect:(CGRect)rect;// 创建椭圆路径+ (instancetype)bezierPathWithOvalInRect:(CGRect)rect;// 创建圆角矩形+ (instancetype)bezierPathWithRoundedRect:(CGRect)rect cornerRadius:(CGFloat)cornerRadius; // rounds all corners with the same horizontal and vertical radius// 创建指定位置圆角的矩形路径+ (instancetype)bezierPathWithRoundedRect:(CGRect)rect byRoundingCorners:(UIRectCorner)corners cornerRadii:(CGSize)cornerRadii;// 创建弧线路径+ (instancetype)bezierPathWithArcCenter:(CGPoint)center radius:(CGFloat)radius startAngle:(CGFloat)startAngle endAngle:(CGFloat)endAngle clockwise:(BOOL)clockwise;// 通过CGPath创建+ (instancetype)bezierPathWithCGPath:(CGPathRef)CGPath;

相关属性和方法

• 属性

// 与之对应的CGPath@property(nonatomic) CGPathRef CGPath;- (CGPathRef)CGPath NS_RETURNS_INNER_POINTER CF_RETURNS_NOT_RETAINED;

// 是否为空@property(readonly,getter=isEmpty) BOOL empty;// 整个路径相对于原点的位置及宽高@property(nonatomic,readonly) CGRect bounds;// 当前画笔位置@property(nonatomic,readonly) CGPoint currentPoint;

// 线宽@property(nonatomic) CGFloat lineWidth;// 终点类型@property(nonatomic) CGLineCap lineCapStyle; typedef CF_ENUM(int32_t, CGLineCap) {    kCGLineCapButt,    kCGLineCapRound,    kCGLineCapSquare};// 交叉点的类型@property(nonatomic) CGLineJoin lineJoinStyle; typedef CF_ENUM(int32_t, CGLineJoin) {    kCGLineJoinMiter,    kCGLineJoinRound,    kCGLineJoinBevel};// 两条线交汇处内角和外角之间的最大距离,需要交叉点类型为kCGLineJoinMiter是生效，最大限制为10@property(nonatomic) CGFloat miterLimit; // 个人理解为绘线的精细程度，默认为0.6，数值越大，需要处理的时间越长@property(nonatomic) CGFloat flatness; // 决定使用even-odd或者non-zero规则@property(nonatomic) BOOL usesEvenOddFillRule;

• 方法

// 反方向绘制path

- (UIBezierPath *)bezierPathByReversingPath;

// 设置画笔起始点

- (void)moveToPoint:(CGPoint)point;

// 从当前点到指定点绘制直线

- (void)addLineToPoint:(CGPoint)point;

// 添加弧线

- (void)addArcWithCenter:(CGPoint)center radius:(CGFloat)radius startAngle:(CGFloat)startAngle endAngle:(CGFloat)endAngle clockwise:(BOOL)clockwise NS_AVAILABLE_IOS(4_0);// center弧线圆心坐标 radius弧线半径 startAngle弧线起始角度 endAngle弧线结束角度 clockwise是否顺时针绘制

// 添加贝塞尔曲线

- (void)addQuadCurveToPoint:(CGPoint)endPoint controlPoint:(CGPoint)controlPoint;// endPoint终点 controlPoint控制点- (void)addCurveToPoint:(CGPoint)endPoint controlPoint1:(CGPoint)controlPoint1 controlPoint2:(CGPoint)controlPoint2;// endPoint终点 controlPoint1、controlPoint2控制点

// 移除所有的点，删除所有的subPath

- (void)removeAllPoints;

// 将bezierPath添加到当前path

- (void)appendPath:(UIBezierPath *)bezierPath;

// 填充

- (void)fill;

// 路径绘制

- (void)stroke;

// 在这以后的图形绘制超出当前路径范围则不可见

- (void)addClip;

直线

- (void)drawRect:(CGRect)rect{    [[UIColor redColor] set];    UIBezierPath* path = [UIBezierPath bezierPath];    path.lineWidth     = 5.f;    path.lineCapStyle  = kCGLineCapRound;    path.lineJoinStyle = kCGLineCapRound;    // 起点    [path moveToPoint:CGPointMake(20, 100)];    // 绘制线条    [path addLineToPoint:CGPointMake(200, 20)];    [path stroke];}

矩形

• 直角矩形

- (void)drawRect:(CGRect)rect{    [[UIColor redColor] set];    // 创建矩形路径对象    UIBezierPath * path = [UIBezierPath bezierPathWithRect:CGRectMake(50, 50, 150, 100)];    path.lineWidth     = 5.f;    path.lineCapStyle  = kCGLineCapRound;    path.lineJoinStyle = kCGLineCapRound;    [path stroke];}

• 圆角矩形

- (void)drawRect:(CGRect)rect{    [[UIColor redColor] set];    // 创建圆角矩形路径对象    UIBezierPath* path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(20, 20, 150, 100) cornerRadius:30]; // 圆角半径为30    path.lineWidth     = 5.f;    path.lineCapStyle  = kCGLineCapRound;    path.lineJoinStyle = kCGLineCapRound;    [path stroke];}

• 指定位置圆角矩形

- (void)drawRect:(CGRect)rect{    [[UIColor redColor] set];    UIBezierPath* path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(20, 20, 150, 100) byRoundingCorners:UIRectCornerTopLeft cornerRadii:CGSizeMake(30, 30)];    path.lineWidth     = 5.f;    path.lineCapStyle  = kCGLineCapRound;    path.lineJoinStyle = kCGLineCapRound;    [path stroke];}

corners：圆角位置  cornerRadii：圆角大小

typedef NS_OPTIONS(NSUInteger, UIRectCorner) {    UIRectCornerTopLeft     = 1 << 0,    UIRectCornerTopRight    = 1 << 1,    UIRectCornerBottomLeft  = 1 << 2,    UIRectCornerBottomRight = 1 << 3,    UIRectCornerAllCorners  = ~0UL};

圆形和椭圆形

• 圆形

- (void)drawRect:(CGRect)rect{    [[UIColor redColor] set];    // 创建圆形路径对象    UIBezierPath * path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(50, 50, 100, 100)];    path.lineWidth     = 5.f;    path.lineCapStyle  = kCGLineCapRound;    path.lineJoinStyle = kCGLineCapRound;    [path stroke];}

• 椭圆形

- (void)drawRect:(CGRect)rect{    [[UIColor redColor] set];    // 创建椭圆形路径对象    UIBezierPath * path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(50, 50, 100, 100)];    path.lineWidth     = 5.f;    path.lineCapStyle  = kCGLineCapRound;    path.lineJoinStyle = kCGLineCapRound;    [path stroke];}

曲线

• 弧线

- (void)drawRect:(CGRect)rect{    [[UIColor redColor] set];    // 创建弧线路径对象    UIBezierPath* path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(100, 100)                                                         radius:70                                                     startAngle:3.1415926                                                       endAngle:3.1415926 *3/2                                                      clockwise:YES];    path.lineWidth     = 5.f;    path.lineCapStyle  = kCGLineCapRound;    path.lineJoinStyle = kCGLineCapRound;    [path stroke];}

center：弧线圆心坐标
radius：弧线半径
startAngle：弧线起始角度
endAngle：弧线结束角度
clockwise：是否顺时针绘制

默认坐标系统中的角度值

• 贝塞尔曲线1

- (void)drawRect:(CGRect)rect{    [[UIColor redColor] set];    UIBezierPath* path = [UIBezierPath bezierPath];    path.lineWidth     = 5.f;    path.lineCapStyle  = kCGLineCapRound;    path.lineJoinStyle = kCGLineCapRound;    [path moveToPoint:CGPointMake(20, 100)];    // 给定终点和控制点绘制贝塞尔曲线    [path addQuadCurveToPoint:CGPointMake(150, 100) controlPoint:CGPointMake(20, 0)];    [path stroke];}

• 贝塞尔曲线2

- (void)drawRect:(CGRect)rect{    [[UIColor redColor] set];    UIBezierPath* path = [UIBezierPath bezierPath];    path.lineWidth     = 5.f;    path.lineCapStyle  = kCGLineCapRound;    path.lineJoinStyle = kCGLineCapRound;    [path moveToPoint:CGPointMake(20, 100)];    // 给定终点和两个控制点绘制贝塞尔曲线    [path addCurveToPoint:CGPointMake(220, 100) controlPoint1:CGPointMake(120, 20) controlPoint2:CGPointMake(120, 180)];    [path stroke];}

扇形

- (void)drawRect:(CGRect)rect{    [[UIColor redColor] set]; // 画笔颜色设置    UIBezierPath * path = [UIBezierPath bezierPath]; // 创建路径    [path moveToPoint:CGPointMake(100, 100)]; // 设置起始点    [path addArcWithCenter:CGPointMake(100, 100) radius:75 startAngle:0 endAngle:3.14159/2 clockwise:NO]; // 绘制一个圆弧    path.lineWidth     = 5.0;    path.lineCapStyle  = kCGLineCapRound; //线条拐角    path.lineJoinStyle = kCGLineCapRound; //终点处理    [path closePath]; // 封闭未形成闭环的路径    [path stroke]; // 绘制}

多边形

- (void)drawRect:(CGRect)rect{    [[UIColor redColor] set];    UIBezierPath* path = [UIBezierPath bezierPath];    path.lineWidth     = 5.f;    path.lineCapStyle  = kCGLineCapRound;    path.lineJoinStyle = kCGLineCapRound;    // 起点    [path moveToPoint:CGPointMake(100, 50)];    // 添加直线    [path addLineToPoint:CGPointMake(150, 50)];    [path addLineToPoint:CGPointMake(200, 100)];    [path addLineToPoint:CGPointMake(200, 150)];    [path addLineToPoint:CGPointMake(150, 200)];    [path addLineToPoint:CGPointMake(100, 200)];    [path addLineToPoint:CGPointMake(50, 150)];    [path addLineToPoint:CGPointMake(50, 100)];    [path closePath];    //根据坐标点连线    [path stroke];    [path fill];}

参考：
http://www.jianshu.com/p/60aad4957923
http://www.jianshu.com/p/bbb2cc485a45

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