UI基础 - UIBezierPath：反转路径 | 虚线 - 低头捡石頭

UI基础 - UIBezierPath：反转路径 | 虚线

反转路径 | 虚线

1 - 反转路径 bezierPathByReversingPath：它并不会去修改一条路径的形状, 仅仅是改变了绘制路径的方向，就是从结束点到开始点反向绘制

 1 - (void)drawRect:(CGRect)rect{
 2     
 3     // 第一条：红色路径
 4     UIBezierPath *path = [UIBezierPath bezierPath];
 5     path.lineWidth = 8;
 6     [path moveToPoint: CGPointMake(10, 120)];
 7     [path addLineToPoint: CGPointMake(180, 40)];
 8     [path addLineToPoint: CGPointMake(40,  80)];
 9     [path addLineToPoint: CGPointMake(140, 140)];
10     // 屏幕中心坐标
11     [path addLineToPoint: CGPointMake(self.frame.size.width*0.5,self.frame.size.height*0.5)];
12     // 为了区分不同路径，这里把红色路径进行平移
13     CGAffineTransform transform = CGAffineTransformMakeTranslation(160, 0);
14     [path applyTransform:transform];
15     [[UIColor redColor] set];
16     [path stroke];
17 
18     // 反转路径
19     UIBezierPath *reversingPath = [path bezierPathByReversingPath];
20     reversingPath.lineWidth = 2;
21     [reversingPath addLineToPoint: CGPointMake(10, 10)];
22     [reversingPath addLineToPoint: CGPointMake(self.frame.size.width*0.5, self.frame.size.height*0.5)];
23     [[UIColor blackColor] set];
24     [reversingPath stroke];
25 }

运行效果

2 - 虚线：setLineDash

 1 -(void)drawRect:(CGRect)rect{
 2 
 3     // 路径 0
 4     UIBezierPath *path0 = [UIBezierPath bezierPath];
 5     [path0 moveToPoint: CGPointMake(80, 40)];
 6     [path0 addLineToPoint: CGPointMake(self.frame.size.width - 40, 40)];
 7     path0.lineWidth = 2;
 8     
 9     // 路径 1
10     UIBezierPath *path1 = [UIBezierPath bezierPath];
11     [path1 moveToPoint: CGPointMake(80, 80)];
12     [path1 addLineToPoint: CGPointMake(self.frame.size.width - 40, 80)];
13     path1.lineWidth = 2;
14     
15     // 路径 2
16     UIBezierPath *path2 = [UIBezierPath bezierPath];
17     [path2 moveToPoint: CGPointMake(80, 120)];
18     [path2 addLineToPoint: CGPointMake(self.frame.size.width - 40, 120)];
19     path2.lineWidth = 2;
20     
21     // 分别配置 3 条路径虚线的规格
22     CGFloat dashLineConfig[] = {8.0, 4.0};
23     [path0 setLineDash: dashLineConfig
24                 count: 2
25                 phase: 0];
26     
27     
28     CGFloat dashLineConfig1[] = {8.0, 4.0, 16.0, 8.0};
29     [path1 setLineDash: dashLineConfig1
30                  count: 4
31                  phase: 0];
32     
33     
34     CGFloat dashLineConfig2[] = {8.0, 4.0, 16.0, 8.0};
35     [path2 setLineDash: dashLineConfig2
36                  count: 4
37                  phase: 12];
38     
39     // 绘制
40     [[UIColor orangeColor] set];
41     [path0 stroke];
42     [path1 stroke];
43     [path2 stroke];
44     
45 }