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如何在 iPhone 中创建饼图？

发布于 2024-10-13 14:17:36 字数 44 浏览 2 评论 0原文

我想按百分比显示我的类别的饼图。

如何创建类别百分比饼图？

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优雅的叶子 2024-10-20 14:17:36

您必须实现一个重写 drawRect: 方法的类并自己绘制饼图。您可以使用 UIBezierPath 类，具体查看 addArcWithCenter:radius:startAngle:endAngle:顺时针:方法绘制圆的一部分。

另请参阅本文和这篇文章。

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风吹雪碎 2024-10-20 14:17:36

有API可以让你做这件事。

MIMChart
CorePlot 有效但不方便的库。

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不再让梦枯萎 2024-10-20 14:17:36

这可能有助于警告“如果它看起来像其他人的代码，那是因为我研究了如何通过网站执行此操作”，以及附加警告“我在启动 iPhone 后不久就这样做了”。欢迎那些想告诉我哪些部分效率低下或错误的人，我仍在学习。

static inline float radians(double degrees) { return degrees * M_PI / 180; }

// making a simple pac man shape
- (UIImage*)getImage {

    UIImage* image;
    if(self.completion == 100.0f) {
        image = [UIImage imageNamed:@"completedTaskIcon.png"];
    } else {
        UIGraphicsBeginImageContext(CGSizeMake(SIDELENGTH, SIDELENGTH));

        CGContextRef context = UIGraphicsGetCurrentContext();

        // the image should have a clear background
        [[UIColor clearColor] set];
        CGRect myRect = CGRectMake(0.0f, 0.0f, SIDELENGTH, SIDELENGTH);
        UIRectFill(myRect);

        // color was hopefully set before this method called
        [self.color set];

        // centre point is required
        CGFloat midx = SIDELENGTH/2;
        CGFloat midy = SIDELENGTH/2;
        // radius of the arc
        CGFloat radius = (SIDELENGTH/2) * 0.60f;

        // pie background
        CGContextSetFillColor(context, CGColorGetComponents([[UIColor orangeColor] CGColor]));
        CGContextBeginPath(context);
        CGContextMoveToPoint(context, midx + radius, midy);
        CGContextAddArc(context, midx, midy, radius,  radians(0), radians(360), 0); 
        CGContextFillPath(context); 

        // pie segment
        CGContextSetFillColor(context, CGColorGetComponents([[UIColor blueColor] CGColor]));
        CGContextBeginPath(context);
        CGContextMoveToPoint(context, midx, midy);
        CGContextAddLineToPoint(context, midx + radius, midy);
        CGContextAddArc(context, midx, midy, radius,  radians(0), radians(360 * (self.completion / 100.0f)), 0); 
        CGContextFillPath(context); 
        image = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
    }

    return image;
}

This might be helpful with the warning that if it looks like someone else's code, it's because I worked out how to do it with web sites, and the additional warning that I did this not long after starting iPhone. People who want to tell me which bits are inefficient or wrong are welcome, I'm still learning.

static inline float radians(double degrees) { return degrees * M_PI / 180; }

// making a simple pac man shape
- (UIImage*)getImage {

    UIImage* image;
    if(self.completion == 100.0f) {
        image = [UIImage imageNamed:@"completedTaskIcon.png"];
    } else {
        UIGraphicsBeginImageContext(CGSizeMake(SIDELENGTH, SIDELENGTH));

        CGContextRef context = UIGraphicsGetCurrentContext();

        // the image should have a clear background
        [[UIColor clearColor] set];
        CGRect myRect = CGRectMake(0.0f, 0.0f, SIDELENGTH, SIDELENGTH);
        UIRectFill(myRect);

        // color was hopefully set before this method called
        [self.color set];

        // centre point is required
        CGFloat midx = SIDELENGTH/2;
        CGFloat midy = SIDELENGTH/2;
        // radius of the arc
        CGFloat radius = (SIDELENGTH/2) * 0.60f;

        // pie background
        CGContextSetFillColor(context, CGColorGetComponents([[UIColor orangeColor] CGColor]));
        CGContextBeginPath(context);
        CGContextMoveToPoint(context, midx + radius, midy);
        CGContextAddArc(context, midx, midy, radius,  radians(0), radians(360), 0); 
        CGContextFillPath(context); 

        // pie segment
        CGContextSetFillColor(context, CGColorGetComponents([[UIColor blueColor] CGColor]));
        CGContextBeginPath(context);
        CGContextMoveToPoint(context, midx, midy);
        CGContextAddLineToPoint(context, midx + radius, midy);
        CGContextAddArc(context, midx, midy, radius,  radians(0), radians(360 * (self.completion / 100.0f)), 0); 
        CGContextFillPath(context); 
        image = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
    }

    return image;
}

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