objective-c - 如何在触摸按钮时更改 UIButton 图像

Question

我试图在触摸按钮时更改 UIButton 图像。目前我它发生了变化，但仅在突出显示的状态发生变化时发生。我希望它改变并留在那里。我尝试了 UIControlStateSelected 来改变状态，但没有成功。

感谢帮助

这是我的代码:

 // Create buttons for the sliding category menu.
    NSMutableArray* buttonArray = [NSMutableArray array];
    NSArray * myImages = [NSArray arrayWithObjects:@"category-cafe-unsel.png", @"category-food-unsel.png", @"category-clothing-unsel.png", @"category-health-unsel.png", @"category-tech-unsel_phone.png" , @"category-tech2-unsel.png", @"catefory-theatre-unsel.png", @"category-travel-unsel.png", nil];

    NSArray * myImagesSel = [NSArray arrayWithObjects:@"category-cafe-sel.png", @"category-food-sel.png", @"category-clothing-sel.png", @"category-health-sel.png", @"category-tech-sel_phone.png" , @"category-tech2-sel.png", @"catefory-theatre-sel.png", @"category-travel-sel.png", nil];

    // only create the amount of buttons based on the image array count
    for(int i = 0;i < [myImages count]; i++)
    {
        // Custom UIButton

        btn = [UIButton buttonWithType:UIButtonTypeCustom];

        [btn setFrame:CGRectMake(0.0f, 20.0f, 52.0f, 52.0f)];
        [btn setTitle:[NSString stringWithFormat:@"Button %d", i] forState:UIControlStateNormal];
        [btn setImage:[UIImage imageNamed:[myImages objectAtIndex:i]] forState:UIControlStateNormal];
        [btn setImage:[UIImage imageNamed:[myImagesSel objectAtIndex:i]] forState:UIControlStateHighlighted];

        NSLog(@"The button title is %@ ", btn.titleLabel.text);

        [btn addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
        [buttonArray addObject:btn];

Answer 1

在您的 IBAction 方法中添加以下行:

 - (IBAction)change:(id)sender
 {
   UIButton *button = (UIButton *)sender;
   int tagOfButton = button.tag - 1;
   [button setImage:[UIImage imageNamed:[myImagesSel objectAtIndex:tagOfButton]] forState:UIControlStateNormal];
 }

将一行添加到您的 for 循环中，例如:

for(int i = 0;i < [myImages count]; i++)
{
    // other stuffs
    btn.tag  = i+1;
}

编辑:

如果您需要在单击其他按钮时撤消之前的选择:

在您的 IBAction 方法中编写此循环。

for(int i = 0;i < [myImages count]; i++)
{
  UIButton *but = (UIButton *)[buttonArray objectAtIndex:i];
  if(but != button)
  {
       [btn setImage:[UIImage imageNamed:[myImages objectAtIndex:i]] forState:UIControlStateNormal];
  }
}

或者简单地将之前的按钮标签存储到一个变量中。 并使用它来更改未完成的图像更改。