从URL加载图像，然后调整大小

Posted 2021-02-26

Some code that will load an image from a remote URL, and then resize it.

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 image
CGSize 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 UIImage
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();		
 
imageHeight = image.size.height;
[imageMain setImage:newImage];
[imageData release];
[image release];