覆盖 Apple 的 UIButton Highlight

Question

我有一个按钮，我在其中设置了它的图像及其选定和突出显示的状态图像，如下所示：

        UIImage *buttonImage = [UIImage imageNamed:@"btn_learn_pad"];
        self.learnMoreButton = [[UIButton alloc] initWithFrame:CGRectMake(50, 0, buttonImage.size.width, buttonImage.size.height)];
        [self.learnMoreButton setImage:buttonImage forState:UIControlStateNormal];
        [self.learnMoreButton setImage:[UIImage imageNamed:@"btn_learn_focus_pad"] forState:UIControlEventTouchUpInside | UIControlStateHighlighted | UIControlStateSelected];
        [self.learnMoreButton addTarget:self action:nil forControlEvents:UIControlEventTouchUpInside];

这仍然会在选择时将 Apple 的较暗 alpha 覆盖在图像顶部。如何消除这种影响？

谢谢

Answer 1

代替 setImage:forState 使用setBackgroundImage:forState:

[self.learnMoreButton setBackgroundImage:[UIImage imageNamed:@"btn_learn_pad"] forState:UIControlStateNormal];
[self.learnMoreButton setBackgroundImage:[UIImage imageNamed:@"btn_learn_focus_pad"] forState:UIControlStateHighlighted];