Question

我使用lineWidth创建一个笔画宽度为4的圆圈。我正在使用UIBezierPath创建圆圈。但是，由于某种原因，无论我为lineWidth分配什么值，lineWidth总是渲染一个具有细笔划的圆。我也尝试将path.lineWidth = 100.0，但笔画宽度没有变化。

这是我的代码：

UIGraphicsBeginImageContextWithOptions(CGSizeMake(progressView.frame.size.width, progressView.frame.size.height), NO, 0.0);

    [[UIColor colorWithRed:246.0/255.0 green:80.0/255.0 blue:36.0/255.0 alpha:1.0] setStroke];

    UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(progressView.frame.size.width/2 ,progressView.frame.size.height/2) radius:progressView.frame.size.width/2 - 5 startAngle:DEGREES_TO_RADIANS(0) endAngle:DEGREES_TO_RADIANS(angle) clockwise:YES];
    [path stroke];
    path.lineWidth = 4;
UIImage* pathImg = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    [progressView setImage:pathImg];

我google了很多，但找不到任何解决这个问题的方法。

Answer 1

您需要在实际描边路径之前设置笔触宽度：

UIGraphicsBeginImageContextWithOptions(CGSizeMake(progressView.frame.size.width, progressView.frame.size.height), NO, 0.0);
[[UIColor colorWithRed:246.0/255.0 green:80.0/255.0 blue:36.0/255.0 alpha:1.0] setStroke];
UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(progressView.frame.size.width/2 ,progressView.frame.size.height/2) radius:progressView.frame.size.width/2 - 5 startAngle:DEGREES_TO_RADIANS(0) endAngle:DEGREES_TO_RADIANS(angle) clockwise:YES];
path.lineWidth = 4;
[path stroke];
UIImage* pathImg = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

[progressView setImage:pathImg];

lineWidth未正确呈现贝塞尔曲线宽度

1 个答案: