Question

我正在尝试创建一些垂直对齐的按钮，但我的代码似乎不起作用。当我尝试模拟器时，什么都没有出现。这是我的代码：

        NSInteger i;
for (i = 1; i <= oneValue.integerValue; i++) {
    UIButton *buttonOne = [[UIButton alloc] initWithFrame:CGRectMake(50, 450 - (30 * i), 25, 25)];
    [buttonOne setImage:[UIImage imageNamed:@"Dark Circle.png"] forState:UIControlStateNormal];
    [buttonOne setImage:[UIImage imageNamed:@"Dark Circle Highlighted.png"] forState:UIControlStateSelected];
}

NSNumber“oneValue”是从之前的用户输入中检索的，是1到20之间的整数。

Answer 1

您需要将按钮添加到超级视图中。如果该代码在UIViewController中执行，那么它应该是：

NSInteger i;
for (i = 1; i <= oneValue.integerValue; i++) {
    UIButton *buttonOne = [[UIButton alloc] initWithFrame:CGRectMake(50, 450 - (30 * i), 25, 25)];
    [buttonOne setImage:[UIImage imageNamed:@"Dark Circle.png"] forState:UIControlStateNormal];
    [buttonOne setImage:[UIImage imageNamed:@"Dark Circle Highlighted.png"] forState:UIControlStateSelected];
    [self.view addSubview:buttonOne];
}

基于NSNumber值创建多个按钮

1 个答案: