Question

在我的iOS 8应用程序中，我正在使用UIActionSheet。我试图在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。

我像这样构建了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];
        }
    }
}

按钮显示，我可以点击并执行动作。但它说count = 0.为什么？

Answer 1

尝试这种方式，更改子视图的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];

我已经尝试过了。它正在......

Answer 2

您尝试检查子视图数量的代理方法： willPresentActionSheet 似乎不合适。

在实际呈现操作表之前调用

willPresentActionSheet 。

如果您检查 didlPresentActionSheet 中的子视图数量，那将更合适。

希望这会有所帮助..

UIActionSheetdelegate没有得到子视图

2 个答案: