ios - 点击时 UIButton 图像不会改变

Question

我需要在点击图像按钮时将其更改为不同的图像。很简单，那里有样本，但它们不适合我。这是我按照示例尝试的:

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake(20, 270, 200, 40.0);
[button setImage:[UIImage imageNamed:@"butterfly3.png"] forState:UIControlStateNormal];
[button setImage:[UIImage imageNamed:@"clicked.png"] forState:UIControlStateSelected | UIControlStateHighlighted];
[button addTarget:self action:@selector(buttonPressed) forControlEvents:UIControlEventTouchDown];
[button setTitle:@"Submit" forState:UIControlStateNormal];
[scrollView button];

现在，我注意到我的按钮设置为在 UIControlEventTouchDown 上执行它的操作，所以我将它添加到“已单击”控件状态，如下所示:

[button setImage:[UIImage imageNamed:@"clicked.png"] forState:UIControlStateSelected | UIControlStateHighlighted | UIControlEventTouchDown];

但图像仍然保持不变。我错过了什么？

Answer 1

只需按此更改您的代码，一切都会正常!

[button setImage:[UIImage imageNamed:@"clicked.png"] forState:UIControlStateHighlighted];
[button setImage:[UIImage imageNamed:@"clicked.png"] forState:UIControlStateSelected];