ios - 蒙版图像在模拟器中工作，但仅在设备上创建白色图像

Question

我正在尝试将两个图像合并为一个以进行屏幕截图。这是代码:

- (void)savePhoto:(id)sender
   UIImage *snapShotImageGL1 = [glView snapUIImage];
   UIImage *maskedImage = [self maskImage:_image withMask:snapShotImageGL1];
   UIImageWriteToSavedPhotosAlbum(maskedImage, nil, nil, nil);
}

然后:

#pragma mark - Image Processing

- (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {

   UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
   [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
   UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
   UIGraphicsEndImageContext();
   return newImage;
}

- (UIImage*) maskImage:(UIImage *)image withMask:(UIImage *)maskImage {

CGImageRef maskRef = maskImage.CGImage;

CGImageRef mask =  CGImageMaskCreate(CGImageGetWidth(maskRef),
                                    CGImageGetHeight(maskRef),
                                    CGImageGetBitsPerComponent(maskRef),
                                    CGImageGetBitsPerPixel(maskRef),
                                    CGImageGetBytesPerRow(maskRef),
                                    CGImageGetDataProvider(maskRef), NULL, false);

CGImageRef masked = CGImageCreateWithMask([image CGImage], mask);
return [UIImage imageWithCGImage:masked];

}

-(UIImage*)invertImage:(UIImage*)image{

    UIGraphicsBeginImageContext(image.size);
    CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeCopy);
    [image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];
    CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeDifference);
    CGContextSetFillColorWithColor(UIGraphicsGetCurrentContext(),[UIColor  
    whiteColor].CGColor);
    CGContextFillRect(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, image.size.width,   
    image.size.height));
    UIImage *returnImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return returnImage;
}

这在模拟器中运行得很好，但在我的设备上运行时它只会创建一张白色的空白照片。关于我在这里做错了什么有什么想法吗？

Answer 1

检查 bundle 中的图像名称。因为模拟器不关心文件是否区分大小写，但设备关心。

如果您的图像名称是“ConverImage.png”，它在模拟器中可以正常工作，但在设备中则不行。尝试将该文件名更改为“convertimage.png”。