iOS截取图片的一部分

来源：互联网发布：ps软件快捷键大全编辑：程序博客网时间：2024/05/22 15:24

UIImage* imgeee = [UIImageimageWithCGImage:CGImageCreateWithImageInRect([self.currentImageForCamera.imageCGImage],CGRectMake(0,0,100,100))];

- (UIImage*)getPartOfImage:(UIImage*)img rect:(CGRect)partRect{

    CGImageRef imageRef = img.CGImage;
    CGImageRef imagePartRef =CGImageCreateWithImageInRect(imageRef, partRect);
    UIImage *retImg = [UIImageimageWithCGImage:imagePartRef];
    CGImageRelease(imagePartRef);
    return retImg;

}

#注释·这种模式会让图片旋转90°。

(UIImage )fixOrientation:(UIImage )aImage {
if (aImage.imageOrientation == UIImageOrientationUp) return aImage;
CGAffineTransform transform = CGAffineTransformIdentity;
switch (aImage.imageOrientation) { case UIImageOrientationDown: case UIImageOrientationDownMirrored: transform = CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height); transform = CGAffineTransformRotate(transform, M_PI); break;
```
 case UIImageOrientationLeft: case UIImageOrientationLeftMirrored:     transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);     transform = CGAffineTransformRotate(transform, M_PI_2);     break; case UIImageOrientationRight: case UIImageOrientationRightMirrored:     transform = CGAffineTransformTranslate(transform, 0, aImage.size.height);     transform = CGAffineTransformRotate(transform, -M_PI_2);     break; default:     break;
```
}
switch (aImage.imageOrientation) { case UIImageOrientationUpMirrored: case UIImageOrientationDownMirrored: transform = CGAffineTransformTranslate(transform, aImage.size.width, 0); transform = CGAffineTransformScale(transform, -1, 1); break;
```
 case UIImageOrientationLeftMirrored: case UIImageOrientationRightMirrored:     transform = CGAffineTransformTranslate(transform, aImage.size.height, 0);     transform = CGAffineTransformScale(transform, -1, 1);     break; default:     break;
```
}
CGContextRef ctx = CGBitmapContextCreate(NULL, aImage.size.width, aImage.size.height, CGImageGetBitsPerComponent(aImage.CGImage), 0, CGImageGetColorSpace(aImage.CGImage), CGImageGetBitmapInfo(aImage.CGImage)); CGContextConcatCTM(ctx, transform); switch (aImage.imageOrientation) { case UIImageOrientationLeft: case UIImageOrientationLeftMirrored: case UIImageOrientationRight: case UIImageOrientationRightMirrored:
```
     CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.height,aImage.size.width), aImage.CGImage);     break; default:     CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.width,aImage.size.height), aImage.CGImage);     break;
```
}
CGImageRef cgimg = CGBitmapContextCreateImage(ctx); UIImage *img = [UIImage imageWithCGImage:cgimg]; CGContextRelease(ctx); CGImageRelease(cgimg); return img;

}

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