蘋果iOS繪製虛線的例子

整理了一個方法，可以直接繪製虛線，下面直接上代碼。參數說明已經給出，可直接copy使用

/**
 ** lineView:       需要繪製成虛線的view
 ** lineLength:     虛線的寬度
 ** lineSpacing:    虛線的間距
 ** lineColor:      虛線的顏色
 **/
+ (void)drawDashLine:(UIView *)lineView lineLength:(int)lineLength lineSpacing:(int)lineSpacing lineColor:(UIColor *)lineColor
{
    CAShapeLayer *shapeLayer = [CAShapeLayer layer];
    [shapeLayer setBounds:lineView.bounds];
    [shapeLayer setPosition:CGPointMake(CGRectGetWidth(lineView.frame) / 2, CGRectGetHeight(lineView.frame))];
    [shapeLayer setFillColor:[UIColor clearColor].CGColor];
   
    //  設定虛線顏色為blackColor
    [shapeLayer setStrokeColor:lineColor.CGColor];
   
    //  設定虛線寬度
    [shapeLayer setLineWidth:CGRectGetHeight(lineView.frame)];
    [shapeLayer setLineJoin:kCALineJoinRound];
   
    //  設定線寬，線間距
    [shapeLayer setLineDashPattern:[NSArray arrayWithObjects:[NSNumber numberWithInt:lineLength], [NSNumber numberWithInt:lineSpacing], nil]];
   
    //  設定路徑
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, NULL, 0, 0);
    CGPathAddLineToPoint(path, NULL, CGRectGetWidth(lineView.frame), 0);
   
    [shapeLayer setPath:path];
    CGPathRelease(path);
   
    //  把繪製好的虛線添加上來
    [lineView.layer addSublayer:shapeLayer];
}