从捕获的图像中选择卡矩形iOS

Question

我正在iOS应用程序中使用相机从捕获的图像中选择卡矩形。所以如果有人知道任何解决方案，请让我知道。谢谢。

Answer 1

我的代码如下：

/** 
* Cut out a image to a new image with the rect 
* 
* @param image UIImage image origin image 
* @param rect CGRect rect the rect area you want 
* 
* @return UIImage 
*/ 
+ (UIImage *)ct_imageFromImage:(UIImage *)image inRect:(CGRect)rect{ 

    CGFloat scale = [UIScreen mainScreen].scale; 
    CGFloat x= rect.origin.x*scale,y=rect.origin.y *scale,w=rect.size.width*scale,h=rect.size.height*scale; 
    CGRect dianRect = CGRectMake(x, y, w, h); 

    //cut the image with the rect area 
    CGImageRef sourceImageRef = [image CGImage]; 
    CGImageRef newImageRef = CGImageCreateWithImageInRect(sourceImageRef, dianRect); 
    UIImage *newImage = [UIImage imageWithCGImage:newImageRef scale:[UIScreen mainScreen].scale orientation:UIImageOrientationUp]; 
    return newImage; 
}