UIButton高亮顯示狀態圖像

Question

我有一個UIButton並設置為：

UIButton *myButton = [UIButton buttonWithType:UIButtonTypeCustom];

UIImage *imageNormal = [UIImage imageNamed:@"normal.png"];
UIImage *imageNormalHover = [UIImage imageNamed:@"normalHover.png"];
UIImage *imageSelected = [UIImage imageNamed:@"selected.png"];
UIImage *imageSelectedHover = [UIImage imageNamed:@"selectedHover.png"];

[myButton setImage:imageNormal forState:UIControlStateNormal];
[myButton setImage:imageSelected forState:UIControlStateSelected];

if (boolVar) {
    [myButton setSelected:YES];
    [myButton setImage:imageSelectedHover forState:UIControlStateHighlighted];
} else {
    [myButton setImage:imageNormalHover forState:UIControlStateHighlighted];
}

問題是當狀態為正常並且我嘗試按按鈕時，我可以正確看到圖像normalHover.png但是當選擇狀態並且嘗試按按鈕時，我仍然看到normalHover.png而不是selectedHover.png 。 似乎使用UIButton我無法更改突出顯示的圖像。 你如何解決？

Answer 1

您需要為UIControlStateSelected | UIControlStateHighlighted設置圖像。 UIControlStateSelected | UIControlStateHighlighted組合狀態：

[myButton setImage:imageSelectedHover forState:(UIControlStateSelected | UIControlStateHighlighted)];

因為在選擇該按鈕時兩種狀態都處於打開狀態，所以您可以通過輕按它來對其進行提示。

Answer 2

很快，這是通過union完成的：

myButton.setImage(imageSelectedHover, forState: UIControlState.Selected.union(UIControlState.Highlighted))