Ios 我怎样才能使线路转弯？

我画了一条像时钟一样旋转的线

这是我理想的一条线

但我的代码是这样运行的

我怎样才能画出第二幅画的线条

这是我的密码

LineLayer.m

    - (void)drawInContext:(CGContextRef)ctx
    {
        CGMutablePathRef path = CGPathCreateMutable();
        CGPoint points[] = {
            CGPointMake(160, 220),
            CGPointMake(160, 120),
        };

        int numPoints = sizeof(points)/sizeof(points[0]);
        CGPathAddLines(path, NULL, points, numPoints);

        CGContextAddPath(ctx, path);
        CGPathRelease(path);

        UIColor *lineColor = [UIColor colorWithWhite:1.0 alpha:1.0];
        CGContextSetStrokeColorWithColor(ctx, lineColor.CGColor);
        CGContextSetLineWidth(ctx, 5.0);
        CGContextDrawPath(ctx, kCGPathStroke);    
}

ViewController.h

- (void)setup
{    
    LineLayer *linelayer = [LineLayer layer];
    linelayer.frame = CGRectInset(self.view.bounds,0.0,0.0);
    linelayer.anchorPoint = CGPointMake(0.5, 0.5);

    [self.view.layer addSublayer:linelayer];
    [linelayer setNeedsDisplay];

 CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
    animation.toValue = [NSNumber numberWithFloat:M_PI / 2.0];
    animation.duration = 0.5;          
    animation.repeatCount = MAXFLOAT;   
    animation.cumulative = YES;         
    [linelayer addAnimation:animation forKey:@"ImageViewRotation"];
}

---

你需要一个时钟秒针之类的东西

#define DEGREES_TO_RADIANS(angle) ((angle) / 180.0 * M_PI)

NSTimer *timer1;//global declaration
CALayer *layerLine;//global declaration

在

viewDidLoad（）中

定时器调用方法

-(void)onTickTick
{
static int i = 180;
if (i==540)//if u change the value for i, it may affect this condition
{
    i=180;
}
i=i+6;//u can replace 6 with 30 or any other value as u require
layerLine.transform = CATransform3DMakeRotation(DEGREES_TO_RADIANS(i), 0.0, 0.0, 1);
}

您需要绘制圆弧而不是简单的直线，您需要使用
CGContextAddArcToPoint
并检查（此）[
-(void)onTickTick
{
static int i = 180;
if (i==540)//if u change the value for i, it may affect this condition
{
    i=180;
}
i=i+6;//u can replace 6 with 30 or any other value as u require
layerLine.transform = CATransform3DMakeRotation(DEGREES_TO_RADIANS(i), 0.0, 0.0, 1);
}