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

得到了我设置的错误

textfield.delegate = self

无需实现任何委托例程。去掉那条线就解决了我的问题

其他回答

如果您想知道是什么代码导致了这些日志,可以在CGPostError上添加一个符号断点。

在我的情况下,我在这段代码中有这些错误:

CAShapeLayer *shapeLayer = [CAShapeLayer layer];
UIBezierPath *path;

path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(0, 0)];
[path addLineToPoint:CGPointMake(size*2, 0)];
[path addLineToPoint:CGPointMake(size, size*2)];
[path closePath];
[path fill];

shapeLayer.path = path.CGPath;
shapeLayer.strokeColor = [[UIColor blackColor] CGColor];
shapeLayer.fillColor = color;
shapeLayer.lineWidth = width;

[self addSublayer:shapeLayer];

经过一些思考和测试,我发现了问题——这是一个电话:

[path fill];

正如我检测到的-在我的代码中,这个调用是不必要的,因为填充将通过其他方式完成-所以我简单地删除它。

直接回答: 这个问题是因为你已经使用了核心图形元素,如CGContext等,而不是- (void)drawRect:(CGRect)rect这个方法。

现在请将代码移到该方法。它将停止给你警告/错误。

就像其他人在这里评论的一样,当我做以下任何一件事时,我得到了这个警告:

在空白文本框中:双击,触摸并按住,长时间单点。

这似乎只影响iOS 7.0.3

我发现了一个工作周围,警告不会被触发,如果你的纸板不是NULL。

所以我在textFieldDidBeginEditing中做了以下事情:

- (void)textFieldDidBeginEditing:(UITextField *)textField {

    UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
    if (pasteboard.string.length == 0) {

        pasteboard.string = @" ";

    }
}

我在iphone 4s、5和5s的iOS 7.0.3模拟器中测试了这一点,不再收到警告。我也在iphone 6和6 plus上的iOS 8模拟器中测试了这一点,但我不相信iOS 8会受到影响。

在发现这个工作之前,我经历了两天的挫折,所以我真的希望我的回答能帮助那些有同样问题的人。

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!