UIActionSheetdelegate 没有获得子视图

Question

在我的 iOS 8 应用程序中，我使用的是 UIActionSheet。我尝试在willPresentActionSheet委托方法中更改按钮标题的颜色，但它没有将按钮识别为其子视图。

我这样构造UIActionSheet：

UIActionSheet *popup = [[UIActionSheet alloc] initWithTitle:@"Select an Option" delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles: nil];
popup.tag = 2;
[popup addButtonWithTitle:@"Add Tag To Chat"];
[popup addButtonWithTitle:@"Remove Tag From Chat"];
[popup addButtonWithTitle:@"Terminate"];
[popup addButtonWithTitle:@"Cancel"];
[popup showInView:self.view];

代表是：

- (void)willPresentActionSheet:(UIActionSheet *)actionSheet
{
    NSLog(@"%d",[actionSheet.subviews count]);
    for (UIView *subview in actionSheet.subviews) {
        if ([subview isKindOfClass:[UIButton class]]) {
            UIButton *button = (UIButton *)subview;
            [button setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
        }
    }
}

按钮正在显示，我可以单击并执行操作。但它说 count = 0。为什么？

Answer 1

试试这个方法，改变子视图的UIColor：

    UIActionSheet * action = [[UIActionSheet alloc]
                              initWithTitle:@"Title"
                              delegate:self
                              cancelButtonTitle:@"Cancel"
                              destructiveButtonTitle:nil
                              otherButtonTitles:@"",nil];
[[[action valueForKey:@"_buttons"] objectAtIndex:0] setTitleColor:[UIColor redColor] forState:UIControlStateNormal];

我试过了。它正在工作......

Answer 2

您尝试检查子视图数量的委托方法：willPresentActionSheet 似乎不合适。

willPresentActionSheet 在实际呈现操作表之前调用。

如果你在didlPresentActionSheet中查看子视图的数量，那会更合适。

希望这会有所帮助..