iOS中我們可以用一個UIView展示一條直線，但是虛線該怎麼實現呢

- (void)viewDidLoad {
    [super viewDidLoad];
    // 要顯示虛線的view
    UIView *lineView = [[UIView alloc]init];
    lineView.backgroundColor = [UIColor whiteColor];
    lineView.frame = CGRectMake(0, 100, 320, 2);
    [self.view addSubview:lineView];
    
    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:[UIColor blackColor].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:3], [NSNumber numberWithInt:1], 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);
    //  把繪製好的虛線新增上來
    [lineView.layer addSublayer:shapeLayer];
}
 

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