如何创建具有对称角的虚线 [英] How to create a dotted line with symmetrical corners

问题描述

我正在从 UIBezierPath 创建虚线，如下所示：

I'm creating a dotted line from a UIBezierPath which looks like this:

这是我用来构建和绘制的代码路径：

This is the code I use to construct and draw the path:

const CGContextRef context = UIGraphicsGetCurrentContext();

const CGSize visibleSize = CGSizeMake(self.width - (kIndent * 2), self.height - (kIndent * 2));
UIBezierPath *borderPath = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(kIndent, kIndent, visibleSize.width, visibleSize.height) cornerRadius:kCornerRadius];
CGContextSetStrokeColorWithColor(context, [UIColor colorWithWhite:1.0 alpha:0.5].CGColor);
[borderPath setLineWidth:2.0];
[borderPath setLineCapStyle:kCGLineCapRound];

const CGFloat pattern[] = {6, 6};
[borderPath setLineDash:pattern count:2 phase:0];

[borderPath stroke];

我想要的是我的广场的每个角落都具有完全相同的曲率。我知道这最终将取决于我的模式值。我尝试从形状的宽度计算不同的值（宽度随屏幕宽度而变化），但我无法得到我想要的外观。

What I want is for each corner of my square to have the exact same curvatures as each other. I know this will ultimately be determined by my pattern values. I have tried calculating different values from the width of the shape (the width changes with screen width), but I can't get my desired look.

有没有人这样做过之前，或有任何想法分享我如何做到这一点？

Has anyone done this before, or have any ideas to share about how I'd do this?

推荐答案

这很简单：

[yourView.layer setBorderWidth:5.0];
[yourView.layer setBorderColor:[[UIColor colorWithPatternImage:[UIImage imageNamed:@"DotedImage.png"]] CGColor]];///just add image name and create image with dashed or doted drawing and add here

这里你只需要添加 QuartzCore / QuartzCore.h 项目中的框架并将其导入如下 .m 文件

Here you're just required to add QuartzCore/QuartzCore.h framework in project and import it as below in .m file

#import <QuartzCore/QuartzCore.h>

或尝试使用

- (void)drawDashedBorderAroundView:(UIView *)v
{
        //border definitions
    CGFloat cornerRadius = 10;
    CGFloat borderWidth = 2;
    NSInteger dashPattern1 = 8;
    NSInteger dashPattern2 = 8;
    UIColor *lineColor = [UIColor orangeColor];

        //drawing
    CGRect frame = v.bounds;

    CAShapeLayer *_shapeLayer = [CAShapeLayer layer];

        //creating a path
    CGMutablePathRef path = CGPathCreateMutable();

        //drawing a border around a view
    CGPathMoveToPoint(path, NULL, 0, frame.size.height - cornerRadius);
    CGPathAddLineToPoint(path, NULL, 0, cornerRadius);
    CGPathAddArc(path, NULL, cornerRadius, cornerRadius, cornerRadius, M_PI, -M_PI_2, NO);
    CGPathAddLineToPoint(path, NULL, frame.size.width - cornerRadius, 0);
    CGPathAddArc(path, NULL, frame.size.width - cornerRadius, cornerRadius, cornerRadius, -M_PI_2, 0, NO);
    CGPathAddLineToPoint(path, NULL, frame.size.width, frame.size.height - cornerRadius);
    CGPathAddArc(path, NULL, frame.size.width - cornerRadius, frame.size.height - cornerRadius, cornerRadius, 0, M_PI_2, NO);
    CGPathAddLineToPoint(path, NULL, cornerRadius, frame.size.height);
    CGPathAddArc(path, NULL, cornerRadius, frame.size.height - cornerRadius, cornerRadius, M_PI_2, M_PI, NO);

        //path is set as the _shapeLayer object's path
    _shapeLayer.path = path;
    CGPathRelease(path);

    _shapeLayer.backgroundColor = [[UIColor clearColor] CGColor];
    _shapeLayer.frame = frame;
    _shapeLayer.masksToBounds = NO;
    [_shapeLayer setValue:[NSNumber numberWithBool:NO] forKey:@"isCircle"];
    _shapeLayer.fillColor = [[UIColor clearColor] CGColor];
    _shapeLayer.strokeColor = [lineColor CGColor];
    _shapeLayer.lineWidth = borderWidth;
    _shapeLayer.lineDashPattern = [NSArray arrayWithObjects:[NSNumber numberWithInt:dashPattern1], [NSNumber numberWithInt:dashPattern2], nil];
    _shapeLayer.lineCap = kCALineCapRound;

        //_shapeLayer is added as a sublayer of the view, the border is visible
    [v.layer addSublayer:_shapeLayer];
    v.layer.cornerRadius = cornerRadius;
}

你可以参加一些学习

http：// lukagabric。 com / cashapelayer-example-round-corners-view-with-dashed-line-border /

https://github.com/lukagabric/LBorderView

使用CALayer绘制虚线

带虚线的UIView

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