Objective C从远程url下载图片方法汇总

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];

以上所述就是本文的全部内容了，希望大家能够喜欢。