覆蓋Apple的UIButton突出顯示

Question

我有一個按鈕，在其中設置其圖像以及其選中和突出顯示的狀態圖像，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];

選擇后，這仍會在圖像頂部覆蓋Apple較暗的Alpha。 如何消除這種影響？

謝謝

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];