iOS-UIBezierPath绘制基本图形

UIBezierPath
UIBezierPath可以创建基于矢量的路径，此类是Core Graphics框架关于路径的封装。使用此类可以定义简单的形状，如椭圆、矩形或者有多个直线和曲线段组成的形状等

使用UIBezierPath画图步骤：
1、创建一个UIBezierPath对象
2、调用-moveToPoint:设置初始线段的起点
3、添加线或者曲线去定义一个或者多个子路径
4、改变UIBezierPath对象跟绘图相关的属性。如，我们可以设置画笔的属性、填充样式等

/* * 绘制三角形 */
 - (void)drawRect:(CGRect)rect {
    // Drawing code
    //初始化路径
    UIBezierPath *path = [UIBezierPath bezierPath];
    //设置路径第一个点
    [path moveToPoint:CGPointMake(50, 50)];
    //设置路径第二个点
    [path addLineToPoint:CGPointMake(self.bounds.size.width-50, 50)];
    //设置路径第三个点
    [path addLineToPoint:CGPointMake(self.bounds.size.width * 0.5, self.bounds.size.height - 50)];
    //闭合路径
    [path closePath];
    //设置线宽
    path.lineWidth = 10;
    //设置填充颜色
    UIColor *fillColor = [UIColor redColor];
    [fillColor set];
    [path fill];
    //设置画笔颜色
    UIColor *strokeColor = [UIColor greenColor];
    [strokeColor set];
    [path stroke];
}

/* * 绘制矩形 */
- (void)drawRect:(CGRect)rect {
    // Drawing code
    //初始化矩形路径
    UIBezierPath *path = [UIBezierPath bezierPathWithRect:CGRectMake(50, 50, self.bounds.size.width-100, self.bounds.size.width-100)];
    //设置线宽
    path.lineWidth = 10;
    //设置填充颜色
    UIColor *fillColor = [UIColor redColor];
    [fillColor set];
    [path fill];
    //设置画笔颜色
    UIColor *strokeColor = [UIColor greenColor];
    [strokeColor set];
    [path stroke];
}

/* * 绘制圆角矩形 */
- (void)drawRect:(CGRect)rect {
    // Drawing code
    //初始化路径
    UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(50, 50, self.bounds.size.width-100, self.bounds.size.width-100) cornerRadius:50];
    //设置线宽
    path.lineWidth = 10;
    //设置填充颜色
    [[UIColor redColor] set];
    [path fill];
    //设置画笔颜色
    [[UIColor greenColor] set];
    [path stroke];
}

/* * 绘制圆角矩形2 */
- (void)drawRect:(CGRect)rect {
    // Drawing code
    //初始化路径
    UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(50, 50, self.bounds.size.width-100, self.bounds.size.width-100) byRoundingCorners:UIRectCornerTopRight cornerRadii:CGSizeMake(200, 200)];
    //设置线宽
    path.lineWidth = 10;
    //设置填充颜色
    [[UIColor redColor] set];
    [path fill];
    //设置画笔颜色
    [[UIColor greenColor] set];
    [path stroke];
}

/* * 绘制梯形 */
- (void)drawRect:(CGRect)rect {
    // Drawing code
    //初始化路径
    UIBezierPath *path = [UIBezierPath bezierPath];
    //设置路径第一个点
    [path moveToPoint:CGPointMake(50, 50)];
    //设置路径第二个点
    [path addLineToPoint:CGPointMake(50, 150)];
    //设置路径第三个点
    [path addLineToPoint:CGPointMake(300, 150)];
    //设置路径第四个点
    [path addLineToPoint:CGPointMake(250, 50)];
    //闭合路径
    [path closePath];
    //设置线宽
    path.lineWidth = 10;
    //设置填充颜色
    UIColor *fillColor = [UIColor redColor];
    [fillColor set];
    [path fill];
    //设置画笔颜色
    UIColor *strokeColor = [UIColor greenColor];
    [strokeColor set];
    [path stroke];
}

/* * 绘制圆 */ - (void)drawRect:(CGRect)rect { // Drawing code //初始化矩形路径 UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(50, 50, self.bounds.size.width-100, self.bounds.size.width-100)]; //设置线宽 path.lineWidth = 10; //设置填充颜色 UIColor *fillColor = [UIColor redColor]; [fillColor set]; [path fill]; //设置画笔颜色 UIColor *strokeColor = [UIColor greenColor]; [strokeColor set]; [path stroke]; }

/* * 绘制椭圆 */ - (void)drawRect:(CGRect)rect { // Drawing code //初始化路径 UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(50, 50, self.bounds.size.width-100, self.bounds.size.width-200)]; //设置线宽 path.lineWidth = 10; //设置填充颜色 UIColor *fillColor = [UIColor redColor]; [fillColor set]; [path fill]; //设置画笔颜色 UIColor *strokeColor = [UIColor greenColor]; [strokeColor set]; [path stroke]; }

/* * 绘制圆弧 */ - (void)drawRect:(CGRect)rect { // Drawing code //设置中心点 CGPoint center = CGPointMake(self.bounds.size.width * 0.4, self.bounds.size.width * 0.4); //绘制路径，最后一个参数是圆弧的方向 UIBezierPath *arcPath = [UIBezierPath bezierPathWithArcCenter:center radius:200 startAngle:0 endAngle:M_2_PI*3 clockwise:YES]; //设置线宽 arcPath.lineWidth = 5; //设置线断面类型 arcPath.lineCapStyle = kCGLineCapRound; arcPath.lineJoinStyle = kCGLineJoinRound; ////设置画笔颜色 [[UIColor redColor] set]; [arcPath stroke]; }

/* * 绘制二次贝塞尔曲线 */ - (void)drawRect:(CGRect)rect { // Drawing code //初始化UIBezierPath UIBezierPath *path = [UIBezierPath bezierPath]; //首先设置一个起始点 [path moveToPoint:CGPointMake(50, 200)]; //首先设置一个终点 CGPoint endPoint = CGPointMake(300, 300); //首先设置一个控制点 CGPoint controlPoint = CGPointMake(180, 30); //添加二次曲线 [path addQuadCurveToPoint:endPoint controlPoint:controlPoint]; //设置线宽 path.lineWidth = 5; //设置线断面类型 path.lineCapStyle = kCGLineCapRound; path.lineJoinStyle = kCGLineJoinRound; ////设置画笔颜色 [[UIColor redColor] set]; [path stroke]; }

/* * 绘制三次贝塞尔曲线 */ - (void)drawRect:(CGRect)rect { // Drawing code //初始化UIBezierPath UIBezierPath *path = [UIBezierPath bezierPath]; //首先设置一个起始点 [path moveToPoint:CGPointMake(30, 150)]; //首先设置一个终点 CGPoint endPoint = CGPointMake(300, 150); //首先设置第一个控制点 CGPoint controlPoint1 = CGPointMake(160, 30); //首先设置第二个控制点 CGPoint controlPoint2 = CGPointMake(160, 250); //添加三次贝塞尔曲线 [path addCurveToPoint:endPoint controlPoint1:controlPoint1 controlPoint2:controlPoint2]; //设置线宽 path.lineWidth = 5; //设置线断面类型 path.lineCapStyle = kCGLineCapRound; path.lineJoinStyle = kCGLineJoinRound; ////设置画笔颜色 [[UIColor redColor] set]; [path stroke]; }