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我希望能够在 612x612 UIImage 中适合任何完整图像，以便在我的应用程序中集成 Instagram。但我不想要任何侧面切割或任何东西。我希望完整图像在横向或纵向中完全适合 612x612 图像。我所追求的就像你可以将图像内容模式设置为适合图像视图的纵横比，我正在寻找一种可以调整到我想要的大小（612x612）同时保持其精确比例的方法。

用户从那里通过 uiimageview 选择现有图像 我希望将选择的图像调整为 612 x 612 图像的大小，同时保持相同的比例但完全在 612x612 范围内 这里是我想要长肖像图像的示例调整大小为方形图像时查看。

在此处输入图像描述

我的 Instagram 集成代码..

NSURL *instagramURL = [NSURL URLWithString:@"instagram://app"];
                        if([[UIApplication sharedApplication] canOpenURL:instagramURL]) //check for App is install or not
                        {

                            UIImage *viewImage;

                            switch (whichPhoto) {
                                case 1:
                                    viewImage = photoOneImageView.image;
                                    break;
                                case 2:
                                    viewImage = photoTwoImageView.image;
                                    break;
                                case 3:
                                    viewImage = photoThreeImageView.image;
                                    break;

                                default:
                                    break;
                            }
                            //here is where i resize my image
                            viewImage = [self scaleImage:viewImage toSize:CGSizeMake(612, 612)];

                            NSData *imageData = UIImagePNGRepresentation(viewImage); //convert image into .png format.
                            NSFileManager *fileManager = [NSFileManager defaultManager];//create instance of NSFileManager
                            NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); //create an array and store result of our search for the documents directory in it
                            NSString *documentsDirectory = [paths objectAtIndex:0]; //create NSString object, that holds our exact path to the documents directory
                            NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"insta.igo"]]; //add our image to the path
                            [fileManager createFileAtPath:fullPath contents:imageData attributes:nil]; //finally save the path (image)
                            NSLog(@"image saved");

                            CGRect rect = CGRectMake(0 ,0 , 0, 0);
                            UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, self.view.opaque, 0.0);
                            [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
                            UIGraphicsEndImageContext();
                            NSString *fileNameToSave = [NSString stringWithFormat:@"Documents/insta.igo"];
                            NSString  *jpgPath = [NSHomeDirectory() stringByAppendingPathComponent:fileNameToSave];
                            NSLog(@"jpg path %@",jpgPath);
                            NSString *newJpgPath = [NSString stringWithFormat:@"file://%@",jpgPath];
                            NSLog(@"with File path %@",newJpgPath);
                            NSURL *igImageHookFile = [[NSURL alloc]initFileURLWithPath:newJpgPath];
                            NSLog(@"url Path %@",igImageHookFile);

                            self.documentController.UTI = @"com.instagram.exclusivegram";
                            self.documentController = [self setupControllerWithURL:igImageHookFile usingDelegate:self];
                            self.documentController=[UIDocumentInteractionController interactionControllerWithURL:igImageHookFile];
                            NSString *caption = @"My caption"; //settext as Default Caption
                            self.documentController.annotation=[NSDictionary dictionaryWithObjectsAndKeys:[NSString stringWithFormat:@"%@",caption],@"InstagramCaption", nil];
                            [self.documentController presentOpenInMenuFromRect:rect inView: self.view animated:YES];
                        }
                        else
                        {
                            NSLog (@"Instagram not found");
                        }
                    }

但相反我得到了这个

在此处输入图像描述

这是我用于调整大小作品的方法，几乎​​适用于横向查看的图像，但不适用于纵向

- (UIImage*) scaleImage:(UIImage*)image toSize:(CGSize)newSize {
    CGSize scaledSize = newSize;
    float scaleFactor = 1.0;
    if( image.size.width > image.size.height ) {
        scaleFactor = image.size.width / image.size.height;
        scaledSize.width = newSize.width;
        scaledSize.height = newSize.height / scaleFactor;
    }
    else {
        scaleFactor = image.size.height / image.size.width;
        scaledSize.height = newSize.height;
        scaledSize.width = newSize.width / scaleFactor;
    }

    UIGraphicsBeginImageContextWithOptions( scaledSize, NO, 0.0 );
    CGRect scaledImageRect = CGRectMake( 0.0, 0.0, scaledSize.width, scaledSize.height );
    [image drawInRect:scaledImageRect];
    UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return scaledImage;
}
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2 回答 2

3

这将创建一个全屏图像，用于在 Instagram 上发布高度大于宽度的图像。

UIImage *originalImage = [UIImage imageNamed:@"lion.jpg"];

// Create rect with height and width equal to originalImages height
CGSize size = CGSizeMake(originalImage.size.height, originalImage.size.height);
UIGraphicsBeginImageContextWithOptions(size, YES, 0);
// Fill the background with some color
[[UIColor lightGrayColor] setFill];
UIRectFill(CGRectMake(0, 0, size.width, size.height));
// Create image for what we just did
UIImage *bgImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

UIGraphicsBeginImageContext(bgImage.size);
// Take originalImage and center it in bgImage
// We get the center of bgImage by (bgImage.size.width / 2)
// But the coords of the originalImage start at the top left (0,0)
// So we need to subtract half of our orginalImages width so that it centers (bgImage.size.width / 2) - (originalImage.size.width / 2)
[originalImage drawInRect:CGRectMake((bgImage.size.width / 2) - (originalImage.size.width / 2), 0, originalImage.size.width, originalImage.size.height)];
// Create image for what we just did
UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

// Set your finalImage to a UIImageView or send it to Instagram
[self.final setImage:finalImage];

要使此功能适用于宽度大于其高度的图像，您只需CGSize size将originalImages.size.width. 然后将其居中以finalImage仅更改方程式以计算高度而不是宽度。

于 2015-02-18T23:45:58.443 回答
0

我只是创建了一个内容模式设置为宽高比的图像视图，然后截图该图像视图..如果其他人有更优雅的解决方案，请告诉我

                    UIImageView *imageview = [[UIImageView alloc] init];
                    imageview.contentMode = UIViewContentModeScaleAspectFit;
                    imageview.frame = CGRectMake(0, 0, 612, 612);
                    imageview.clipsToBounds = NO;
                    imageview.image = viewImage;

                   CGSize imageSize = CGSizeMake(imageview.bounds.size.width, imageview.bounds.size.height);
                    UIGraphicsBeginImageContext(imageSize);
                    [imageview.layer renderInContext:UIGraphicsGetCurrentContext()];
                    viewImage = UIGraphicsGetImageFromCurrentImageContext();
                    UIGraphicsEndImageContext();
于 2015-02-19T15:29:28.403 回答