CGContext错误/警告

Question

我有下面的代码来截图。我特别没有使用UIGraphicsBeginImageContext，因为之前我发现它使用了非常多的内存：

    CGSize size = activeView.frame.size;

    NSUInteger width = size.width;
    NSUInteger height = size.height;

    NSLog(@"BEFORE");

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

    unsigned char *rawData = malloc(height * width * 4);
    memset(rawData,0,height * width * 4);

    NSUInteger bytesPerPixel = 4;
    NSUInteger bytesPerRow = bytesPerPixel * width;
    NSUInteger bitsPerComponent = 8;
    CGContextRef context = CGBitmapContextCreate(rawData, width, height, bitsPerComponent, bytesPerRow, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);

    CGRect bounds;
    bounds.origin = CGPointMake(0,0);
    bounds.size = size;

    CGContextDrawImage(context, CGRectMake(0, 0, size.width, size.height), [self.topimage CGImage]);
    CGContextDrawImage(context, CGRectMake(0, 0, size.width, size.height), [bottomimage CGImage]);

    CGImageRef imageRef = CGBitmapContextCreateImage(context);
    UIImage *latest = [UIImage imageWithCGImage:imageRef scale:0.0 orientation:UIImageOrientationDownMirrored];

    [activeView.layer renderInContext:UIGraphicsGetCurrentContext()];

    CGImageRef imageRef2 = CGBitmapContextCreateImage(context);
    UIImage *latest2 = [UIImage imageWithCGImage:imageRef2 scale:0.0 orientation:UIImageOrientationDownMirrored];

    CGContextRelease(context);
    CGImageRelease(imageRef);
    CGImageRelease(imageRef2);

    NSLog(@"AFTER");

在“之前”和“之后”NSLogs之间，出现以下错误/警告：

<Error>: CGContextSaveGState: invalid context 0x0
<Error>: CGContextSetAlpha: invalid context 0x0
<Error>: CGContextSaveGState: invalid context 0x0
<Error>: CGContextSetFillColorWithColor: invalid context 0x0
<Error>: CGContextAddRect: invalid context 0x0
<Error>: CGContextDrawPath: invalid context 0x0
<Error>: CGContextRestoreGState: invalid context 0x0
<Error>: CGContextSaveGState: invalid context 0x0
<Error>: CGContextGetBaseCTM: invalid context 0x0
<Error>: CGContextConcatCTM: invalid context 0x0
<Error>: CGContextSetBaseCTM: invalid context 0x0
<Error>: CGContextSaveGState: invalid context 0x0
<Error>: CGContextClipToRect: invalid context 0x0
<Error>: CGContextSetAlpha: invalid context 0x0
<Error>: CGContextSaveGState: invalid context 0x0
<Error>: CGContextSetFillColorWithColor: invalid context 0x0
<Error>: CGContextAddRect: invalid context 0x0
<Error>: CGContextDrawPath: invalid context 0x0
<Error>: CGContextRestoreGState: invalid context 0x0
<Error>: CGContextSaveGState: invalid context 0x0
<Error>: CGContextConcatCTM: invalid context 0x0
<Error>: CGContextConcatCTM: invalid context 0x0
<Error>: CGContextClipToRect: invalid context 0x0
<Error>: CGContextDrawImage: invalid context 0x0
<Error>: CGContextRestoreGState: invalid context 0x0
<Error>: CGContextRestoreGState: invalid context 0x0
<Error>: CGContextSetBaseCTM: invalid context 0x0
<Error>: CGContextRestoreGState: invalid context 0x0

为什么会发生这种情况？

Answer 1

[activeView.layer renderInContext:UIGraphicsGetCurrentContext()];

这一行是problem...you没有“当前”上下文。请改用context。

Answer 2

这是iOS模拟器的一个问题。(苹果公司正在解决这个问题)

转到iOS模拟器->重置内容和设置

清理项目，然后重新运行它。我的问题解决了。一切都会恢复正常。