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使用UIImagePickerController拍摄图像

  •  3
  • Biranchi  · 技术社区  · 15 年前

    我使用此委托方法获取图像。

    - (void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary*)info
    {
    
            UIImage *image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
    
    }
    

    问题是什么?我做得对吗?

    1 回复  |  直到 13 年前
        1
  •  6
  •   maxbareis    15 年前

    使用此代码(也可以调整图片大小)我在网络中的某个地方找到了它,但记不起在哪里:

    @implementation UIImage (Resizing)
    
    static inline double radians (double degrees) {return degrees * M_PI/180;}
    
    
    - (UIImage*)imageByScalingToSize:(CGSize)targetSize {
     UIImage* sourceImage = self; 
     CGFloat targetWidth = targetSize.width;
     CGFloat targetHeight = targetSize.height;
    
     CGImageRef imageRef = [sourceImage CGImage];
     CGBitmapInfo bitmapInfo = CGImageGetBitmapInfo(imageRef);
     CGColorSpaceRef colorSpaceInfo = CGImageGetColorSpace(imageRef);
    
     if (bitmapInfo == kCGImageAlphaNone) {
         bitmapInfo = kCGImageAlphaNoneSkipLast;
     }
    
     CGContextRef bitmap;
    
     if (sourceImage.imageOrientation == UIImageOrientationUp || sourceImage.imageOrientation == UIImageOrientationDown) {
         bitmap = CGBitmapContextCreate(NULL, targetWidth, targetHeight, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, bitmapInfo);
    
     } else {
         bitmap = CGBitmapContextCreate(NULL, targetHeight, targetWidth, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, bitmapInfo);
    
     }       
    
     if (sourceImage.imageOrientation == UIImageOrientationLeft) {
         CGContextRotateCTM (bitmap, radians(90));
         CGContextTranslateCTM (bitmap, 0, -targetHeight);
    
     } else if (sourceImage.imageOrientation == UIImageOrientationRight) {
         CGContextRotateCTM (bitmap, radians(-90));
         CGContextTranslateCTM (bitmap, -targetWidth, 0);
    
     } else if (sourceImage.imageOrientation == UIImageOrientationUp) {
         // NOTHING
     } else if (sourceImage.imageOrientation == UIImageOrientationDown) {
         CGContextTranslateCTM (bitmap, targetWidth, targetHeight);
         CGContextRotateCTM (bitmap, radians(-180.));
     }
    
     CGContextDrawImage(bitmap, CGRectMake(0, 0, targetWidth, targetHeight), imageRef);
     CGImageRef ref = CGBitmapContextCreateImage(bitmap);
     UIImage* newImage = [UIImage imageWithCGImage:ref];
    
     //CGContextRelease(bitmap);
     //CGImageRelease(ref);
    
     return newImage; 
    }
    
    @end