图片

获取网络图片宽高

先导入 ImageIO框架

#import

- (CGSize)getImageSizeWithURL:(NSURL *)url

{

   CGImageSourceRef image = CGImageSourceCreateWithURL((CFURLRef)url, NULL);

   CGFloat width = 0.0f, height = 0.0f;

   

   if (image)

   {

       CFDictionaryRef imageAcc = CGImageSourceCopyPropertiesAtIndex(image, 0, NULL);

       

       if (imageAcc != NULL)

       {

           CFNumberRef widthNumber  = CFDictionaryGetValue(imageAcc, kCGImagePropertyPixelWidth);

           if (widthNumber != NULL) {

               CFNumberGetValue(widthNumber, kCFNumberFloatType, &width);

           }

           

           CFNumberRef heightNumber = CFDictionaryGetValue(imageAcc, kCGImagePropertyPixelHeight);

           if (heightNumber != NULL) {

               CFNumberGetValue(heightNumber, kCFNumberFloatType, &height);

           }

           

           CFRelease(imageAcc);

       }

       CFRelease(image);

       NSLog(@"Image dimensions: %.0f x %.0f px", width, height);

   }

   return CGSizeMake(width, height);

}