单击按钮如何更改imageView中的图像

Question

我想在单击按钮时更改图像视图中的图像，但是它没有改变。 我正在使用JPG图像加载到图像视图中

- (IBAction) changeImage:(id)sender 
{
    UIButton *tappedButton = (UIButton*) sender;
    NSInteger selectedIndex = [tappedButton tag];

    if (selectedIndex==0)
    {
        UIImage *modelimage = [UIImage imageNamed:@"compositone.jpg"];
        modelImagewView.image=modelimage; 
    } 
    else 
    {
        UIImage *modelimage = [UIImage imageNamed:@"composittwo.jpg"]; 
        modelImagewView.image=modelimage; 
    }
}

Answer 1

试试这种格式modelImagewView.image = [UIImage imageNamed:@"composittwo.jpg"];

另外，请确保已正确设置tag号，以使selectedIndex并非始终为0。同时检查是否已将此IBAction链接到适当的按钮。

Answer 2

试试这个代码

- (IBAction) changeImage:(id)sender 
{
    UIButton *tappedButton = (UIButton*) sender;

    if (tappedButton.tag==0) 
   {
       modelImageView.image=[UIImage imageNamed:@"compositone.jpg"];
   } 
   else 
   { 
       modelImageView.image=[UIImage imageNamed:@"composittwo.jpg"];
   }
}