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我有这段代码，我认为这是这里的问题：

CGContextRef context =  CGBitmapContextCreate(nil,
                                              routeView.frame.size.width,
                                              routeView.frame.size.height,
                                              8,
                                              4 * routeView.frame.size.width,
                                              CGColorSpaceCreateDeviceRGB(),
                                              kCGImageAlphaPremultipliedLast);

CGContextSetStrokeColorWithColor(context, lineColor.CGColor);
CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 1.0);
CGContextSetLineWidth(context, 1.0);

来自：https ://github.com/kadirpekel/MapWithRoutes/tree/master/Classes

这实际上是在对该项目进行任何更改，然后我尝试将某些内容导入我的代码并且不起作用，我收到此错误：

Feb  5 14:16:17 alejandro.upes.itccanarias.org GPSTestMap[2878] <Error>: CGContextSetStrokeColorWithColor: invalid context 0x0
Feb  5 14:16:17 alejandro.upes.itccanarias.org GPSTestMap[2878] <Error>: CGContextSetRGBFillColor: invalid context 0x0
Feb  5 14:16:17 alejandro.upes.itccanarias.org GPSTestMap[2878] <Error>: CGContextSetLineWidth: invalid context 0x0
Feb  5 14:16:17 alejandro.upes.itccanarias.org GPSTestMap[2878] <Error>: CGContextDrawPath: invalid context 0x0
Feb  5 14:16:17 alejandro.upes.itccanarias.org GPSTestMap[2878] <Error>: CGBitmapContextCreateImage: invalid context 0x0
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1 回答 1

0

答案是@Sohaib 评论：

Make sure your routeView is initialized properly and CGBitmapContextCreate function doesn't return nil– Sohaib 2013 年 2 月 5 日在 14:32

于 2020-08-28T13:45:30.827 回答