UIButton背景图像在点击时不会改变

Question

我有一个 UIButton，我已成功为其设置了背景图像。我想在用户点击它时更改背景图像（导航到下一个视图控制器）。不幸的是，点击时背景不会改变。但是，当我点击并按住按钮时，它确实发生了变化，所以我很困惑。代码如下所示：

UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(x_offset, y_offset, width, BUTTON_HEIGHT)];
    [button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    button.backgroundColor = [UIColor whiteColor];
    UIImage *buttonImage = [[UIImage imageNamed:@"main_button"]
                            resizableImageWithCapInsets:UIEdgeInsetsMake(10, 10, 10, 10)];
    UIImage *pressedbuttonImage = [[UIImage imageNamed:@"main_button_pressed"]
                            resizableImageWithCapInsets:UIEdgeInsetsMake(10, 10, 10, 10)];
    [button setBackgroundImage:buttonImage forState:UIControlStateNormal];
    [button setBackgroundImage:pressedbuttonImage forState:UIControlStateHighlighted];
    [button setBackgroundImage:pressedbuttonImage forState:UIControlStateApplication];
    [button setBackgroundImage:pressedbuttonImage forState:UIControlStateDisabled];
    [button setBackgroundImage:pressedbuttonImage forState:UIControlStateReserved];
    [button setBackgroundImage:pressedbuttonImage forState:UIControlStateSelected];
    return button;

我知道我在 UIControlStates 上做得过火了，但我想演示一下我已经全部尝试过了：)

Answer 1

问题是您仅在每个事件发生时更改图像。当您点击并按住它时，它将显示突出显示的图像。当您更改该状态时，它会恢复为正常状态并显示图像（正常背景图像）

您可以通过两种方式实现所需的行为：

1)

在您的IBAction 中，更改正常的按钮图像。

- (IBAction)buttonPressed:(UIButton *)button
{
   UIImage *pressedbuttonImage = [[UIImage imageNamed:@"main_button_pressed"] resizableImageWithCapInsets:UIEdgeInsetsMake(10, 10, 10, 10)];
   [button setBackgroundImage:pressedbuttonImage forState:UIControlStateNormal];
}

2)

将按钮的selected或highlighted属性设置为true

- (IBAction)buttonPressed:(UIButton *)button
{
   button.selected = YES;
}

Answer 2

问题是一旦您停止点击按钮，按钮的背景图像将默认为您为 UIControlStateNormal 设置的任何背景图像。所以你需要做的是，当你的按钮被点击时，将 UIControlStateNormal 背景图像重置为你选择按钮后想要的任何图像。