ios CGImageRelease 出现 EXC_BAD_ACCESS的错误 ios特定形状剪裁图片 内存泄露
CGImageRef imgRef = [image CGImage]; 通过此种方式的得到的CGImageRef不能利用CGImageRelease释放,因为你不拥有它所以不用释放
在ios中特定形状剪裁图片的实现(注意要释放内存,不然即使用ARC也会出现内存泄露)
- (UIImage*) maskImage:(UIImage *)image withMask:(UIImage *)mask { CGImageRef imgRef = [image CGImage]; CGImageRef maskRef = [mask CGImage]; CGImageRef actualMask = CGImageMaskCreate(CGImageGetWidth(maskRef), CGImageGetHeight(maskRef), CGImageGetBitsPerComponent(maskRef), CGImageGetBitsPerPixel(maskRef), CGImageGetBytesPerRow(maskRef), CGImageGetDataProvider(maskRef), NULL, NO); CGImageRef masked = CGImageCreateWithMask(imgRef, actualMask); UIImage *newImage = [UIImage imageWithCGImage:masked]; CGImageRelease(actualMask); CGImageRelease(masked); return newImage; }