如何在iOS 6.0中将彩色图像更改为黑白图像？

Question

我使用下面的代码来转换黑白图像。它的工作正常。但是我改变了图像的亮度和对比度。应用程序仅在iOS 6.0上崩溃。我使用任何已弃用的方法？请帮帮我。更改亮度和对比度通过此链接提前https://github.com/esilverberg/ios-image-filters

- (UIImage *)convertImageToGrayScale:(UIImage *)image 
{ 
    CGRect imageRect = CGRectMake(0, 0, image.size.width, image.size.height); 
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray(); 
    CGContextRef context = CGBitmapContextCreate(nil, image.size.width, image.size.height, 8, 0, colorSpace, kCGImageAlphaNone); 
    CGContextDrawImage(context, imageRect, [image CGImage]); 
    CGImageRef imageRef = CGBitmapContextCreateImage(context); 
    UIImage *newImage = [UIImage imageWithCGImage:imageRef]; 
    CGColorSpaceRelease(colorSpace); 
    CGContextRelease(context); 
    CFRelease(imageRef); 
    return newImage; 
} 

感谢。

Answer 1

检查的不赞成的方法

https://developer.apple.com/library/ios/#releasenotes/General/RN-iOSSDK-6_0/_index.html

http://www.bgr.com/2012/07/16/ios-6-download-beta-3-change-log/

https://developer.apple.com/library/mac/#releasenotes/DeveloperTools/RN-Xcode/_index.html