UIButton背景图片在水龙头上不变

Question

我有一个UIButton，我成功地设置了背景图片。我想在用户点击它时更改背景图片（导航到下一个视图控制器）。不幸的是，背景不会改变水龙头。不过，它确实当我点击并按住按钮，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; 

我知道我与UIControlStates过分了，但我想演示，我已经试过所有:)

Answer 1

问题是你只是在每个事件发生时改变图像。当你点击并按住它时会显示突出显示的图像。当您更改状态时，它恢复到正常状态，并显示图像（正常的背景图像）

可以达到所期望的行为方式有两种：

1）

在你IBAction，改变正常的按钮图像。

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

2）

套装selected或true

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

Answer 2

好问题是，一旦你停止敲击按钮，该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轻敲时，在选择按钮后将UIControlStateNormal背景图像重置为你想要的任何图像。