Objective C中远程下载获取图片的详细教程

　　今天小编给大家分享一篇Objective C中远程下载获取图片的详细教程，感兴趣的朋友跟小编一起来了解一下吧!

　　Objective C从远程url下载图片

　　- (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;

　　}

　　objective C从远程地址获取图片并修改尺寸

　　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];

　　以上所述就是Objective C中远程下载获取图片的详细教程了，希望大家能够喜欢。