如何在目标c中裁剪图像？ [英] How to crop the image in objective c?

问题描述

用户可以更改编辑屏幕中默认显示的裁剪框大小。我试过下面的代码：

The user can change the cropbox size which is shows default in edit screen. I tried with below code :

- (UIImage *)imageByCropping:(UIImage *)imageToCrop toRect:(CGRect)rect {

    CGImageRef imageRef = CGImageCreateWithImageInRect([imageToCrop CGImage], rect);
    UIImage *cropped = [UIImage imageWithCGImage:imageRef];
    CGImageRelease(imageRef); 
    return cropped;
}

但它裁剪固定区域。如何裁剪用户选择的区域？

But it cropped fixed area. How to crop area which is selected by user ?

推荐答案

获取裁剪图像：

UIImage *croppedImg = nil;
CGRect cropRect = CGRectMake("AS YOu Need"); //set your rect size.
croppedImg = [self croppIngimageByImageName:self.imageView.image toRect:cropRect];

使用以下代码调用 croppIngimageByImageName：toRect：返回<$的方法c $ c> UIImage （具有特定尺寸的图像）

Use following code for call croppIngimageByImageName:toRect: method that return UIImage (with specific size of image)

- (UIImage *)croppIngimageByImageName:(UIImage *)imageToCrop toRect:(CGRect)rect
    {
        //CGRect CropRect = CGRectMake(rect.origin.x, rect.origin.y, rect.size.width, rect.size.height+15);

        CGImageRef imageRef = CGImageCreateWithImageInRect([imageToCrop CGImage], rect);
        UIImage *cropped = [UIImage imageWithCGImage:imageRef];
        CGImageRelease(imageRef);

        return cropped;
    }

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