ios 绘制曲线走势图
- (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); }]; }
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