iOS学习- iOS绘制垂直/水平虚线

方法：

新建一个类（例如DashLine）继承UIView，，在其类中写入以下代码

/// 将当前线绘制成虚线
/// @param lineLength 虚线的宽度
/// @param lineSpacing 虚线的间距
/// @param lineColor 虚线的颜色
/// @param isHorizonal 虚线的方向 YES 为水平方向，NO 为垂直方向
- (void)drawDashedWithLineLength:(NSInteger)lineLength lineSpacing:(NSInteger)lineSpacing lineColor:(UIColor *)lineColor lineDirection:(BOOL)isHorizonal {
    CAShapeLayer *shapeLayer = [CAShapeLayer layer];
    [shapeLayer setBounds:self.bounds];

    if (isHorizonal) {
        [shapeLayer setPosition:CGPointMake(CGRectGetWidth(self.frame) / 2, CGRectGetHeight(self.frame))];
    } else {
        [shapeLayer setPosition:CGPointMake(CGRectGetWidth(self.frame) / 2, CGRectGetHeight(self.frame) / 2)];
    }
    
    [shapeLayer setFillColor:[UIColor clearColor].CGColor];
    // 设置虚线颜色
    [shapeLayer setStrokeColor:lineColor.CGColor];
    
    // 设置虚线宽度
    if (isHorizonal) {
        [shapeLayer setLineWidth:CGRectGetHeight(self.frame)];
    } else {

        [shapeLayer setLineWidth:CGRectGetWidth(self.frame)];
    }
    
    [shapeLayer setLineJoin:kCALineJoinRound];
    // 设置线宽，线间距
    [shapeLayer setLineDashPattern:@[[NSNumber numberWithInteger:lineLength], [NSNumber numberWithInteger:lineSpacing]]];
    // 设置路径
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, NULL, 0, 0);

    if (isHorizonal) {
        CGPathAddLineToPoint(path, NULL,CGRectGetWidth(self.frame), 0);
    } else {
        CGPathAddLineToPoint(path, NULL, 0, CGRectGetHeight(self.frame));
    }

    [shapeLayer setPath:path];
    CGPathRelease(path);
    // 把绘制好的虚线添加上来
    [self.layer addSublayer:shapeLayer];
}

调用：

Dashline *line = [[Dashline alloc] initWithFrame:CGRectMake(0, 0, 100, 0.5)];
//调用方法
[line drawDashedWithLineLength:2 lineSpacing:2 lineColor:[UIColor blackColor] lineDirection:YES];
[self addSubview:line];