iOS之绘制虚线

/*

  ** lineFrame:     虚线的 frame

  ** length:        虚线中短线的宽度

  ** spacing:       虚线中短线之间的间距

  ** color:         虚线中短线的颜色

*/

+ (UIView *)createDashedLineWithFrame:(CGRect)lineFrame

                           lineLength:(int)length

                          lineSpacing:(int)spacing

                            lineColor:(UIColor *)color{

    UIView *dashedLine = [[UIView alloc] initWithFrame:lineFrame];

    dashedLine.backgroundColor = [UIColor clearColor];

    CAShapeLayer *shapeLayer = [CAShapeLayer layer];

    [shapeLayer setBounds:dashedLine.bounds];

    [shapeLayer setPosition:CGPointMake(CGRectGetWidth(dashedLine.frame) / 2, CGRectGetHeight(dashedLine.frame))];

    [shapeLayer setFillColor:[UIColor clearColor].CGColor];

    [shapeLayer setStrokeColor:color.CGColor];

    [shapeLayer setLineWidth:CGRectGetHeight(dashedLine.frame)];

    [shapeLayer setLineJoin:kCALineJoinRound];

    [shapeLayer setLineDashPattern:[NSArray arrayWithObjects:[NSNumber numberWithInt:length], [NSNumber numberWithInt:spacing], nil]];

    CGMutablePathRef path = CGPathCreateMutable();

    CGPathMoveToPoint(path, NULL, 0, 0);

    CGPathAddLineToPoint(path, NULL, CGRectGetWidth(dashedLine.frame), 0);

    [shapeLayer setPath:path];

    CGPathRelease(path);

    [dashedLine.layer addSublayer:shapeLayer];

    return dashedLine;

}