适用于iOS的Image Cropping API [英] Image Cropping API for iOS

问题描述

是否有任何裁剪图像API用于在Xcode项目中动态裁剪图像的目标C？请提供一些技巧或技巧如何在iPhone中裁剪相机图像。

Is there any cropping image API for objective C that crops images dynamically in Xcode project? Please provide some tricks or techniques how could I crop camera images in iPhone.

推荐答案

您可以使用以下简单代码裁剪图像。您必须传递图像和作为裁剪区域的CGRect。在这里，我裁剪图像，以便获得原始图像的中心部分，返回的图像是正方形。

You can use below simple code to crop an image. You have to pass the image and the CGRect which is the cropping area. Here, I crop image so that I get center part of original image and returned image is square.

// Returns largest possible centered cropped image.
- (UIImage *)centerCropImage:(UIImage *)image
{
    // Use smallest side length as crop square length
    CGFloat squareLength = MIN(image.size.width, image.size.height);
    // Center the crop area
    CGRect clippedRect = CGRectMake((image.size.width - squareLength) / 2, (image.size.height - squareLength) / 2, squareLength, squareLength);

    // Crop logic
    CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], clippedRect);
    UIImage * croppedImage = [UIImage imageWithCGImage:imageRef];
    CGImageRelease(imageRef);
    return croppedImage;
}

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