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

其他回答

我有同样的问题，我忘记导入QuartzCore/QuartzCore.h，这解决了我的问题与这些错误。

    #import <QuartzCore/QuartzCore.h>

2014-01-31 02:32:34

我有这个问题在一个UITextField，当我持有一个空白字段与占位符文本的触摸。我使用以下方法来消除空白字段:

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

        textField.text=[@" " stringByAppendingString:textField.text];

        //other stuff here
}


-(BOOL)textFieldShouldReturn:(UITextField *)textField{

         if(textField.text.length>0){
             if([[textField.text substringToIndex:1] isEqualToString:@" "])
                 textField.text=[textField.text substringFromIndex:1];
         }
         //  other stuff here
}

2014-02-17 09:03:52

对我来说，我得到这个错误，因为我正在释放CGContextRef，如下所示:

- (void)drawRect:(CGRect)rect
{
    CGContextRef context = UIGraphicsGetCurrentContext();

    // DRAW BACKGROUND CIRCLE
    CGContextSetFillColorWithColor(context, [[UIColor gray] colorWithAlphaComponent:0.6].CGColor);
    CGContextFillEllipseInRect(context, rect);

//    CGContextRelease(context);
}

删除版本解决了这个问题

2014-08-26 17:41:33

在某些情况下，你可能需要包含一行#import <QuartzCore/QuartzCore.h>。

2014-07-17 06:46:26

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

无效上下文0x0在iOS 7.0和系统降级

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