Question

每次我在模拟器或iPhone上运行我的应用程序时，控制台都会显示以下语句。它究竟想说什么？

**      *尝试弹出未知的自动释放池（0x6830200）
    ＆LT;错误＆gt;：CGContextScaleCTM：无效的上下文0x0
    ＆LT;错误＆gt;：CGContextTranslateCTM：无效的上下文0x0
    ＆LT;错误＆gt;：CGContextConcatCTM：无效的上下文0x0
    ＆LT;错误＆gt;：CGContextDrawImage：无效的上下文0x0
    ＆LT;错误＆gt;：CGContextScaleCTM：无效的上下文0x0
    ＆LT;错误＆gt;：CGContextTranslateCTM：无效的上下文0x0
    ＆LT;错误＆gt;：CGContextConcatCTM：无效的上下文0x0
    ＆LT;错误＆gt;：CGContextDrawImage：无效的上下文0x0
    ＆LT;错误＆gt;：CGContextScaleCTM：无效的上下文0x0
    ＆LT;错误＆gt;：CGContextTranslateCTM：无效的上下文0x0
    ＆LT;错误＆gt;：CGContextConcatCTM：无效的上下文0x0
    ＆LT;错误＆gt;：CGContextTranslateCTM：无效的上下文0x0
    ＆LT;错误＆gt;：CGContextConcatCTM：无效的上下文0x0
    ＆LT;错误＆gt;：CGContextDrawImage：无效的上下文0x0

如何解决？

以下是imgPic是UIImage实例的参考代码......

    int kMaxResolution = 640;   
    CGImageRef imgRef = imgPic.CGImage; 
    CGFloat width = CGImageGetWidth(imgRef);    
    CGFloat height = CGImageGetHeight(imgRef);  
    CGAffineTransform transform = CGAffineTransformIdentity;    
    CGRect bounds = CGRectMake(0, 0, width, height);
    if (width > kMaxResolution || height > kMaxResolution) 
    {       
        CGFloat ratio = width/height;       
        if (ratio > 1) 
        {           
            bounds.size.width = kMaxResolution;         
            bounds.size.height = roundf(bounds.size.width / ratio);         
        }       
        else 
        {
            bounds.size.height = kMaxResolution;            
            bounds.size.width = roundf(bounds.size.height * ratio);         
        }       
    }   
    CGFloat scaleRatio = bounds.size.width / width; 
    CGSize imageSize = CGSizeMake(CGImageGetWidth(imgRef), CGImageGetHeight(imgRef));   
    CGFloat boundHeight;    

    UIGraphicsBeginImageContext(bounds.size);   
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextScaleCTM(context, scaleRatio, -scaleRatio);        
    CGContextTranslateCTM(context, 0, -height);     

    CGContextConcatCTM(context, transform); 
    CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, width, height), imgRef); 
    UIImage *imageCopy = UIGraphicsGetImageFromCurrentImageContext();   
    UIGraphicsEndImageContext();

Answer 1

我认为他试图告诉你，你的背景无效。：）

控制台中的错误消息

1 个答案: