iphone - UIGraphicsBeginImageContextWithOptions 无提示崩溃

Question

所以我有一个函数可以拍摄两张图像并将它们组合起来。也许图像太大，因为当我尝试使用 2 个较小的图像时，效果很好，但我不确定。所以我用相机拍了一张照片，然后尝试从相册中打开它。我选择图像并使用此函数将其与另一个图像组合:

- (UIImage*)imageByCombiningImage:(UIImage*)firstImage withImage:(UIImage*)secondImage {

    UIImage *image = nil;

    float scale = 0.5f;

    CGSize newImageSize = CGSizeMake(MAX(firstImage.size.width, secondImage.size.width), MAX(firstImage.size.height, secondImage.size.height));

        NSLog(@"reached image by combining image");
    //crashes here when the image has been selected from an album (secondImage).
    // runs fine when the image has been taken from the camera. (secondImage). 

    if (UIGraphicsBeginImageContextWithOptions != NULL) {
        UIGraphicsBeginImageContextWithOptions(newImageSize, NO, [[UIScreen mainScreen] scale]);
    } else {
        UIGraphicsBeginImageContext(newImageSize); 
    }



    [firstImage drawAtPoint:CGPointMake(roundf((newImageSize.width-firstImage.size.width)/2), 
                                        roundf((newImageSize.height-firstImage.size.height)/2))]; 

    UIImage *scaledImage = 
    [UIImage imageWithCGImage:[secondImage CGImage] 
                        scale:scale orientation:UIImageOrientationUp];

    [scaledImage drawAtPoint:CGPointMake(roundf((100)), 
                                         roundf((100)))]; 
    image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return image;
}

当我到达这一行时:

if (UIGraphicsBeginImageContextWithOptions != NULL) {
    UIGraphicsBeginImageContextWithOptions(newImageSize, NO, [[UIScreen mainScreen] scale]);
} else {
    UIGraphicsBeginImageContext(newImageSize); 
}

它无声地崩溃了。我想这可能是内存问题？ 该方法也被异步调用。

Answer 1

我必须将图像的大小减小 3 才能停止合并时的崩溃。太大了。