iOS图片裁剪为正方形时imageOrientation自动改变了

shelly

于 2016-05-05 15:21:44 发布

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分类专栏： UIImage ios 文章标签： imageOrientation自动改变 iOS

本文链接：https://blog.youkuaiyun.com/garr_odie/article/details/51323273

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1 篇文章

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本文介绍了一个iOS中使用UIImagePickerController拍照后图片自动旋转的问题及解决方案。通过调整UIImage的初始化方式，确保了无论从相册选择还是拍照获取的图片都能正确显示。

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拍照或者相册的图片上传.

要求上传正方形,在裁剪的时候发现imageOrientation自动改变了.

但是从相册选不会，拍照会.

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    [picker dismissViewControllerAnimated:YEScompletion:^{}];
    UIImage *image = [infoobjectForKey:UIImagePickerControllerOriginalImage];
    //图片裁剪成正方形
    UIImage *resizeImage;
    CGFloat iw = image.size.width;
    CGFloat ih = image.size.height;
    CLog(@"image's size w:%f  h:%f",iw,ih);
    if (iw > ih) {//长大于宽
        CGImageRef cgimage =CGImageCreateWithImageInRect([imageCGImage], CGRectMake(0,0, ih, ih));
        resizeImage = [[UIImagealloc] initWithCGImage:cgimagescale:1orientation:image.imageOrientation];
    } else { 
        CGImageRef cgimage =CGImageCreateWithImageInRect([imageCGImage], CGRectMake(0,0, iw, iw));
        resizeImage = [[UIImagealloc] initWithCGImage:cgimagescale:1orientation:image.imageOrientation];
    }
}

之前用的是

resizeImage = [UIImageimageWithCGImage:cgimage];

改成 resizeImage = [[UIImage alloc] initWithCGImage:cgimage scale:1 orientation:image.imageOrientation];就可以了