iOS开发之--从URL加载图片

+ (UIImage *) imageFromURLString: (NSString *) urlstring  
{  
    // This call is synchronous and blocking  
    return [UIImage imageWithData:[NSData  
        dataWithContentsOfURL:[NSURL URLWithString:urlstring]]];  
} 

直接转化一下就可以直接拿到图片！