ios 绘制曲线走势图

来源：互联网发布：梅西过人知乎编辑：程序博客网时间：2024/04/27 19:07

- (void)drawLine{        //view是曲线的背景view    UIView *view = [[UIView alloc]initWithFrame:CGRectMake(10, 0, 300, 300)];    view.backgroundColor = [UIColor whiteColor];    [self.view addSubview:view];    //第一、UIBezierPath绘制线段    UIBezierPath *path = [UIBezierPath bezierPath];        //四个点    CGPoint point = CGPointMake(10, 10);    CGPoint point1 = CGPointMake(200, 100);    CGPoint point2 = CGPointMake(240, 200);    CGPoint point3 = CGPointMake(290, 200);        NSArray *arr = [NSArray arrayWithObjects:[NSValue valueWithCGPoint:point],[NSValue valueWithCGPoint:point1],[NSValue valueWithCGPoint:point2],[NSValue valueWithCGPoint:point3], nil];    NSIndexSet *set = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, arr.count)];

   //第二、就是这句话绘制

    [arr enumerateObjectsAtIndexes:set options:0 usingBlock:^(NSValue *pointValue, NSUInteger idx, BOOL *stop){                CGPoint point = [pointValue CGPointValue];        [path addLineToPoint:point];                //（一）rect折线画法        CGRect rect;        rect.origin.x = point.x - 1.5;        rect.origin.y = point.y - 1.5;        rect.size.width = 4;        rect.size.height = 4;                //（二）rect射线画法//        CGRect rect = CGRectMake(10, 10, 1, 1);                UIBezierPath *arc= [UIBezierPath bezierPathWithOvalInRect:rect];        [path appendPath:arc];    }];    //第三、UIBezierPath和CAShapeLayer关联    CAShapeLayer *lineLayer = [CAShapeLayer layer];    lineLayer.frame = CGRectMake(0, 150, 320, 400);    lineLayer.fillColor = [UIColor redColor].CGColor;    lineLayer.path = path.CGPath;    lineLayer.strokeColor = [UIColor redColor].CGColor;    [view.layer addSublayer:lineLayer];        //以下代码为附加的    //（一）像一个幕布一样拉开，显得有动画    UIView *view1 = [[UIView alloc]initWithFrame:CGRectMake(0, 100, 320, 400)];    view1.backgroundColor = [UIColor whiteColor];    [self.view addSubview:view1];        [UIView animateWithDuration:5 animations:^{        view1.frame = CGRectMake(320, 100, 320, 400);    }]; }

0 0