如何以编程方式在imageview上调用服务器映像？

Question

我有一个应用程序，我在我的imageview中显示图像，该图像来自我的XML解析。我创建了一个自定义的tableview单元格。然后我创建了一个全局变量，它将保存我的图像值，该值将通过xml解析和我在imageview上设置的全局变量

这是我的代码：

//first image is my global variable which holds my xmlparser value
firstimage =cond1.Icon

firstviewimage = [[UIImageView alloc] init];
    //[image1 setImage:[UIImage imageNamed:mWeatherImg]];
    [firstviewimage setBackgroundColor:[UIColor grayColor]];
    [firstviewimage setFrame:CGRectMake(50,30, 40, 40)];
    firstviewimage.image= (UIImage*)firstimage;

    // firstviewimage is my imageview where i am setting my global
    // variable.in my global variable the value  of the server image
    // is getting passed but that image is not getting set to my imageview. 
    // My app crashes giving an error in the console that [NSCFString scale]:
    // unrecognized selector sent to instance 0x4e2dce0'

[firstview addSubview:firstviewimage];

Answer 1

firstviewimage.image= [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://www.domain.com/ururlofImage.png"]]];