1. UIBezierPath类的介绍
UIBezierPath主要用来绘制矢量图形，它是基于Core Graphics对CGPathRef数据类型和path绘图属性的一个封装，所以是需要图形上下文的CGContextRef，所以一般UIBezierPath在drawRect中使用。
2.UIBezierPath 的常用属性
@property(nonatomic) CGPathRef CGPath; //UIBezierPath类转换成CGPath
@property(nonatomic,readonly) CGPoint currentPoint; //当前path的位置，可以理解为path的终点
@property(nonatomic) CGFloat lineWidth; //path宽度
//kCGLineCapButt, // 无端点
//kCGLineCapRound, // 圆形端点
//kCGLineCapSquare // 方形端点
@property(nonatomic) CGLineCap lineCapStyle;
//kCGLineJoinMiter, // 尖角
//kCGLineJoinRound, // 圆角
//kCGLineJoinBevel // 缺角
@property(nonatomic) CGLineJoin lineJoinStyle;
//最大斜接长度（只有在使用kCGLineJoinMiter是才有效）， 边角的角度越小，斜接长度就会越大，为了避免斜接长度过长，使用lineLimit属性限制，如果斜接长度超过miterLimit，边角就会以KCALineJoinBevel类型来显示
@property(nonatomic) CGFloat miterLimit;
3.UIBezierPath的类方法
//仅仅初始化,需要添加路径。
+ (instancetype)bezierPath;
//矩形的路径。
+ (instancetype)bezierPathWithRect:(CGRect)rect;
//获得圆形或椭圆的路径。
+ (instancetype)bezierPathWithOvalInRect:(CGRect)rect;
// 获得圆角矩形路径，四周均圆角 。
+ (instancetype)bezierPathWithRoundedRect:(CGRect)rect cornerRadius:(CGFloat)cornerRadius;
//获得圆角矩形路径，是某些角圆角，UIRectCorner是枚举类型
+ (instancetype)bezierPathWithRoundedRect:(CGRect)rect byRoundingCorners:(UIRectCorner)corners cornerRadii:(CGSize)cornerRadii;
//获得圆弧路径,参数依次是圆心，半径，起始角度，结束角度，是否顺时针（yes是顺时针，no是逆时针）
+ (instancetype)bezierPathWithArcCenter:(CGPoint)center radius:(CGFloat)radius startAngle:(CGFloat)startAngle endAngle:(CGFloat)endAngle clockwise:(BOOL)clockwise;
//用一条CGPath初始化另一条path。
+ (instancetype)bezierPathWithCGPath:(CGPathRef)CGPath;
4. 为UIBezierPath对象添加路径
//UIBezierPath对象的起始点
- (void)moveToPoint:(CGPoint)point;
//从path的最后一点开始绘制一条线到目标点
- (void)addLineToPoint:(CGPoint)point;
// 添加一条三次贝塞尔曲线
- (void)addCurveToPoint:(CGPoint)endPoint
controlPoint1:(CGPoint)controlPoint1
controlPoint2:(CGPoint)controlPoint2;
//添加一条二次贝塞尔曲线
- (void)addQuadCurveToPoint:(CGPoint)endPoint
controlPoint:(CGPoint)controlPoint;
// 添加一条圆弧
- (void)addArcWithCenter:(CGPoint)center
radius:(CGFloat)radius
startAngle:(CGFloat)startAngle
endAngle:(CGFloat)endAngle
clockwise:(BOOL)clockwise ;
/** 为path添加虚线，pattern数组存放各段虚线的长度，count是数组元素数量，phase是起始位置 */
- (void)setLineDash:(nullable const CGFloat *)pattern
count:(NSInteger)count
phase:(CGFloat)phase;
5. UIBezierPath的使用
- 直线
- (void)drawRect:(CGRect)rect {
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointZero];
[path addLineToPoint:CGPointMake(100, 100)];
path.lineWidth = 10;
[[UIColor redColor] setStroke];
path.lineJoinStyle = kCGLineJoinRound;
[path stroke];
}
0.png
- 三角形
- (void)drawRect:(CGRect)rect {
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(10, 10)];
[path addLineToPoint:CGPointMake(100, 100)];
[path addLineToPoint:CGPointMake(150, 30)];
// [path addLineToPoint:CGPointMake(10, 10)];
[path closePath];
path.lineWidth = 10;
[[UIColor redColor] setStroke];
path.lineJoinStyle = kCGLineJoinRound;
[path stroke];
}
BB970ACE-C3E1-4090-B7AA-B0A439DD619B.png
- 矩形
- (void)drawRect:(CGRect)rect {
UIBezierPath *path = [UIBezierPath bezierPathWithRect:CGRectMake(30, 30, 100, 50)];
path.lineWidth = 3;
[path stroke];
}
5E2C8EE6-7C5C-47BA-88B2-58F963CBB749.png
- 椭圆
- (void)drawRect:(CGRect)rect {
UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(20, 20, 100, 50)];
path.lineWidth = 3;
[path stroke];
}
0DBA2E10-0657-4F71-B57F-5F88B74413C7.png
- 圆
- (void)drawRect:(CGRect)rect {
UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(20, 20, 100, 100)];
path.lineWidth = 3;
[path stroke];
}
63600FF0-E7F3-4B32-B262-FAD70ADAAC59.png
- 带有圆角的矩形
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(50, 50, 50, 50) cornerRadius:5.0f];
path.lineWidth = 5.0f;
[path stroke];
3440AE1C-3680-4F6E-A052-79EF642D1F3C.png
- 特定的角为圆角的矩形
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(50, 50, 50, 50) byRoundingCorners:UIRectCornerBottomRight cornerRadii:CGSizeMake(5,5)];
path.lineWidth = 3.0f;
[path closePath];
[path stroke];
D14185F3-1592-4817-A86F-04E93F816B9D.png
- 圆弧
UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(100, 100) radius:25 startAngle:0 endAngle:M_PI clockwise:YES];
path.lineWidth = 5.0f;
[path stroke];
E3BD176C-42D0-4CE0-B7AE-3826F20AE1B4.png
- 通过路径A创建路径B
UIBezierPath *path_A = [UIBezierPath bezierPath];
[path_A moveToPoint:CGPointMake(50, 50)];
[path_A addLineToPoint:CGPointMake(100, 100)];
UIBezierPath *path_B = [UIBezierPath bezierPathWithCGPath:path_A.CGPath];
path_B.lineWidth = 30.0f;
[[UIColor redColor] setStroke];
[path_B stroke];
8F5B11AC-EB99-45F2-8F07-FA89EE38DD06.png
- 三次贝塞尔曲线
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(0, 100)];
[path addCurveToPoint:CGPointMake(200, 100) controlPoint1:CGPointMake(50, 150) controlPoint2:CGPointMake(150, 50)];
[[UIColor greenColor] setStroke];
path.lineWidth = 5;
[path stroke];
FB0E6D26-64C0-4C39-92B2-25D07120A5FA.png
- 二次贝塞尔曲线
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(0, 100)];
[path addQuadCurveToPoint:CGPointMake(200, 100) controlPoint:CGPointMake(100, 0)];
[[UIColor yellowColor] setStroke];
path.lineWidth = 5;
[path stroke];
AC6E51B6-BE16-4199-A1E8-FACF7D73FA5A.png
- 圆弧
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(100, 100)];
[path addArcWithCenter:CGPointMake(100, 100) radius:70 startAngle:0 endAngle:M_PI_2 clockwise:YES];
[[UIColor yellowColor] setFill];
path.lineWidth = 5;
[path fill];
BEE657C0-2765-4EDD-8085-87314D2141B9.png
- 追加路径
UIBezierPath *path_A = [UIBezierPath bezierPath];
[path_A moveToPoint:CGPointMake(0, 0)];
[path_A addLineToPoint:CGPointMake(100, 100)];
UIBezierPath *path_B = [UIBezierPath bezierPath];
[path_B moveToPoint:CGPointMake(110, 130)];
[path_B addLineToPoint:CGPointMake(150, 150)];
[path_A appendPath:path_B];
[path_A stroke];
F034CACC-E709-4E55-A616-4A451740B63F.png
- 创建翻转路径，即起点变成终点，终点变成起点
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(0, 50)];
[path addLineToPoint:CGPointMake(50, 50)];
path.lineWidth = 5.0f;
//UIBezierPath[9922:403506] {50, 50}
NSLog(@"%@",NSStringFromCGPoint(path.currentPoint));
//起点变成终点，终点变成起点
UIBezierPath *path_b = [path bezierPathByReversingPath];
//UIBezierPath[9922:403506] {0, 50}
NSLog(@"%@",NSStringFromCGPoint(path_b.currentPoint));
CGAffineTransform transform = CGAffineTransformMakeTranslation(150, 0);
// 向右平移150
[path_b applyTransform: transform];
//UIBezierPath[9943:404532] {150, 50}
NSLog(@"%@",NSStringFromCGPoint(path_b.currentPoint));
path_b.lineWidth = 5.0f;
[path addLineToPoint:CGPointMake(100, 100)];
[path_b addLineToPoint:CGPointMake(100, 100)];
[[UIColor yellowColor] set];
[path stroke];
[[UIColor greenColor] set];
[path_b stroke];
B1C86127-D6F4-4D42-A3CB-14BA65666764.png
- 路径进行仿射变换
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(50, 50)];
[path addLineToPoint:CGPointMake(100, 100)];
[[UIColor redColor] setStroke];
path.lineWidth = 5.0f;
[path stroke];
UIBezierPath *pathb = [UIBezierPath bezierPathWithCGPath:path.CGPath];
CGAffineTransform transform = CGAffineTransformRotate(self.transform, M_PI/20);
[pathb applyTransform:transform];
[[UIColor greenColor] setStroke];
pathb.lineWidth = 5.0f;
[pathb stroke];
162637BF-623A-4ECA-9BA1-A21D7780FDDE.png
- 虚线
CGFloat dashStyle[] = {20.0f, 3.0f ,5.0f};
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(50, 50)];
[path addLineToPoint:CGPointMake(170, 50)];
[path setLineDash:dashStyle count:3 phase:0.0];
[[UIColor greenColor] setStroke];
path.lineWidth = 10;
[path stroke];
54039348-2B24-4B94-8C7A-836B558295F0.png
- 设置当前图形上下文的绘图区域可见,随后的绘图只能在上面的path里才可以看到。
UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(100, 100, 100, 100)];
[[UIColor greenColor] setStroke];
//只有在path里才能看见，其他的切了。
[path addClip];
[path stroke];
UIBezierPath *path1 = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(100, 100, 80, 80)];
[[UIColor greenColor] setStroke];
[[UIColor redColor] setFill];
path1.lineWidth = 10;
[path1 stroke];
[path1 fill];
74E064FF-C004-4755-9D5A-B3D07EF6C474.png
