我有一个返回旋转图像的方法:
- (CGImageRef)rotateImage:(CGImageRef)original degrees:(float)degrees {
if (degrees == 0.0f) {
return original;
} else {
double radians = degrees * M_PI / 180;
#if TARGET_OS_EMBEDDED || TARGET_IPHONE_SIMULATOR
radians = -1 * radians;
#endif
size_t _width = CGImageGetWidth(original);
size_t _height = CGImageGetHeight(original);
CGRect imgRect = CGRectMake(0, 0, _width, _height);
CGAffineTransform _transform = CGAffineTransformMakeRotation(radians);
CGRect rotatedRect = CGRectApplyAffineTransform(imgRect, _transform);
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(NULL,
rotatedRect.size.width,
rotatedRect.size.height,
CGImageGetBitsPerComponent(original),
0,
colorSpace,
kCGImageAlphaPremultipliedFirst);
CGContextSetAllowsAntialiasing(context, FALSE);
CGContextSetInterpolationQuality(context, kCGInterpolationNone);
CGColorSpaceRelease(colorSpace);
CGContextTranslateCTM(context,
+(rotatedRect.size.width/2),
+(rotatedRect.size.height/2));
CGContextRotateCTM(context, radians);
CGContextDrawImage(context, CGRectMake(-imgRect.size.width/2,
-imgRect.size.height/2,
imgRect.size.width,
imgRect.size.height),
original);
CGImageRef rotatedImage = CGBitmapContextCreateImage(context);
CFRelease(context);
return rotatedImage;
}
}
然而,乐器告诉我rotatedImage:
没有被释放。我正在运行这种方法,所以内存积累了很多。我应该在调用rotateImage:
的父方法中释放它吗?或者我应该在rotateImage:
传回之前将其发布?
谢谢!
答案 0 :(得分:1)
我建议在调用rotateImage:
的父方法中释放CGImageRef
此外,在这种情况下,您应该使用命名约定并将rotateImage:
重命名为createRotateImage:
以便清楚。