Objective C从远程url下载图片方法汇总

- (UIImage *) getImageFromURL: (NSString *)theURL {  UIImage *theImage = NULL;  NSString *imageFileName = [BT_strings getFileNameFromURL:theURL];  NSData *imageData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:theURL]];  theImage = [[UIImage alloc] initWithData:imageData];  [BT_fileManager saveImageToFile:theImage fileName:imageFileName];  return theImage;}

NSString* imageURL = [NSString stringWithFormat: @"http://theimageurl.com/?id=%@", [[resultsEntries objectAtIndex:0] objectForKey: @"image_large"]];NSData* imageData = [[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:imageURL]]; UIImage* image = [[UIImage alloc] initWithData:imageData]; // resize imageCGSize newSize = CGSizeMake(100, 100);UIGraphicsBeginImageContext( newSize );// a CGSize that has the size you want[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)]; //image is the original UIImageUIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();     imageHeight = image.size.height;[imageMain setImage:newImage];[imageData release];[image release];