ios 用url获取图片的方法

UIImageView *imgHeadView = [[UIImageView alloc]initWithFrame:CGRectMake(5, 5, 60, 60)];
NSURL *url = [NSURL URLWithString:[[NSString alloc]initWithFormat:@"%@%@%@",nstrPublicUrl,@"/uploadfiles/",customerMgr.nsstrImgUrl]];
NSData *data = [NSData dataWithContentsOfURL:url];
UIImage *aimage = [[UIImage alloc] initWithData:data];
[imgHeadView setImage:aimage];
[imgHeadView setNeedsDisplay];
[aimage release];
[tvCell addSubview:imgHeadView];