无效上下文0x0在iOS 7.0和系统降级

关于这个可怕的问题，我已经阅读了尽可能多的搜索结果，不幸的是，每个搜索结果似乎都集中在一个特定的函数调用上。

我的问题是，我从多个函数得到相同的错误，我猜是从我使用的函数回调的。

更糟糕的是，实际的代码是在另一个项目中导入的自定义私有框架中，因此，调试不是那么简单吗?

有人能告诉我正确的方向吗?我有一种感觉，我正在错误地调用某些方法或与坏的上下文，但xcode的输出在这一点上不是很有帮助。

: CGContextSetFillColorWithColor: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update. : CGContextSetStrokeColorWithColor: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update. CGContextSaveGState: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update. : CGContextSetFlatness: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update. : CGContextAddPath: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update. : CGContextDrawPath: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update. : CGContextRestoreGState: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update. : CGContextGetBlendMode: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.

当呈现自定义视图或其继承的类之一时，可能会发生这些错误。这时它们会生成多次，直到键盘不再提供任何输入。触摸事件仍然被注册，但是系统变慢，最终可能导致未分配对象错误。

编辑#1:我确实可以访问正在导入的框架，但我没有看到导致问题的类中有任何奇怪的东西。

编辑#2:我刚刚收到一封电子邮件，iOS 7.1已经发布给开发者了。我很好奇这种情况是否会消失，或者变得更糟，或者是否能得到解决。

当前回答

我得到了代码错误

UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:pointA];
[path addLineToPoint:pointB];
[path addLineToPoint:pointC];
[[UIColor colorWithHexString:@"EFEFEF"] set];
[path fill];
[path closePath];

CAShapeLayer *triangle = [CAShapeLayer layer];
triangle.fillColor = [UIColor colorWithHexString:@"EFEFEF"].CGColor;
triangle.path = path.CGPath;

return triangle;

并在删除代码后

[[UIColor colorWithHexString:@"EFEFEF"] set];
[path fill];

世界变得寂静

2016-03-23 08:27:13

其他回答

我也有同样的问题。在我的项目中，我尝试创建一个文本字段，并将其添加到我的pdf文件。旧的代码:

- (void) drawInContext:(CGContextRef)context {
    //Otherwise we're upside-down
    CGContextSetTextMatrix(context, CGAffineTransformMake(1.0,0.0, 0.0, -1.0, 0.0, 0.0));

    CGContextSetTextDrawingMode(context, kCGTextFill); // This is the default
    [[UIColor blackColor] setFill]; // ***This is the problem ***

    CGFloat x = self.rect.origin.x;
    CGFloat y = self.rect.origin.y + self.font.pointSize;
    [self.text drawAtPoint:CGPointMake(x, y)
            withAttributes:@{NSFontAttributeName:[UIFont fontWithName:@"Arial" size:12]}];
}

解决此问题后，代码更改为:

old:[[UIColor blackColor] setFill]; 

new:CGContextSetFillColorWithColor(context, [[UIColor blackColor] CGColor]);

我发现解决方案在UIColor SetFill不工作。谢谢那个帮手。

2014-12-03 07:41:18

我使用下面的代码从上下文创建UIImage:

    UIGraphicsBeginImageContext(size);
    CGContextRef context = UIGraphicsGetCurrentContext();

    CGContextSetFillColorWithColor(context, color.CGColor);
    CGContextFillRect(context, (CGRect){.size = size});

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

这样我就得到了错误。

所以我删除了派生数据内容，重新启动XCode。这招奏效了。

2014-02-03 10:16:46

这些类型的错误是历史上调用核心图形函数的结果，而不是在一个上下文中建立的drawRect或调用之间，如UIGraphicsBeginImageContext和UIGraphicsEndImageContext(或其他UIKit函数，如开始和结束一个上下文)。

话虽如此，但bilobatum说的没错，这一系列错误可能是他在回答中提到的iOS 7漏洞造成的。如果在你的iOS6目标中没有看到这些错误，或者在快速扫描这个私有框架后，你没有发现任何可疑的核心图形调用，这可能只是iOS 7的错误。接得好，双叶巴坦!

2013-10-25 21:26:38

如果在使用UIBezierPath并为描边或填充设置颜色时发生错误，请将设置的颜色代码放在drawRect函数中而不是其他地方。

2016-07-04 03:42:18

当我在UIActivity子类的activityImage方法中输入错误的图像名称时，我得到了它

- (UIImage *)activityImage
{
    return [UIImage imageNamed:@"img.png"];
}

输入正确的图像为我解决了这个问题。

2014-08-31 20:57:51

无效上下文0x0在iOS 7.0和系统降级

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