在保持比例的同时，以612x612的尺寸将完整图像适合Instagram [英] Fit FULL image in 612x612 size for Instagram while keeping ratio

问题描述

我希望能够将612x612 UIImage中的任何完整图像都适合在我的应用中进行Instagram集成.但是我不希望任何侧面割伤或其他任何东西.我希望整个图像在横向或纵向上都能完全适合612x612图像.即时通讯就像是您可以设置图像内容模式以适合图像视图的宽高比，以寻找一种可以调整为我想要的尺寸(612x612)并保持其确切比例的方法.

I want to be able to fit any FULL image in a 612x612 UIImage for Instagram integration in my app. But i don't want any of the sides cut or anything. I want the full image weather its in landscape or portrait to fit fully in a 612x612 image. What im after is just like you can set an image content mode to aspect fit in an image view im looking for a method that will resize to my desired size(612x612) while keep its exact ratio.

用户通过uiimageview从那里选择一个现有图像，我希望该图像被选择以612图像的尺寸调整为612，同时保持相同的比例，但仍完全位于612x612范围内，此处是我想要的图像的示例调整为正方形图像时要看的长肖像图像.

The user selects an existing image through a uiimageview from there I want that image selected to be resized to 612 by 612 image while keeping the same ratio yet fully being within the 612x612 bounds here an example of what image f what i want a long portrait image to look when resized into a square image.

我的instagram集成代码.

My instagram integration code..

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");
                        }
                    }

但是我得到了这个

这是我用于调整大小的方法的方法，几乎​​适用于横向查看的图像，而非纵向视图

Here is the method i use for resized works almost for landscape viewed images but not portrait

- (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;
}

推荐答案

这将创建全屏图像，以便在Instagram上发布高度大于宽度的图像.

This will create a full screen image for posting on Instagram for images that have heights greater than their widths.

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];

要对宽度大于其高度的图像进行此操作，只需将CGSize size设置为originalImages.size.width.然后将其居中放置finalImage，只需更改方程式即可计算高度而不是宽度.

To make this work for images with widths greater than their heights you would just set the CGSize size to originalImages.size.width. Then to center it for the finalImage just change the equation to calculate for height rather than width.

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