ios - UIButton 没有添加到 UIView

Question

我在这里尝试在viewforprofileandsetting View 上添加两个按钮，但下面的代码不起作用:

( UIView * )viewForProfileAndSettingButton 
{
    setingAndProfileView=[[ UIView alloc ]initWithFrame:CGRectMake(0,_listView.frame.size.height, _listView.frame.size.width, _listView.frame.size.height/4)];
    setingAndProfileView.backgroundColor=[ UIColor darkGrayColor ];
    profileViewButton=[[ UIButton alloc ]init];
    profileViewButton =[ UIButton buttonWithType:UIButtonTypeRoundedRect];
    profileViewButton.backgroundColor=[ UIColor whiteColor ];
    [ profileViewButton setTitle:@" profile View" forState:UIControlStateNormal ];
   profileViewButton.frame=CGRectMake(setingAndProfileView.frame.origin.x+5, setingAndProfileView.frame.origin.y+10, setingAndProfileView.frame.size.width/2-50, setingAndProfileView.frame.size.height/2+10);

    settingButton=[[ UIButton alloc ]init];
    settingButton.backgroundColor=[ UIColor whiteColor ];
    settingButton=[ UIButton buttonWithType:UIButtonTypeRoundedRect ];

    settingButton.frame=CGRectMake(profileViewButton.frame.origin.x+profileViewButton.frame.size.width+10, setingAndProfileView.frame.origin.y+10, setingAndProfileView.frame.size.width/2-50, setingAndProfileView.frame.size.height/2+10);
    [ settingButton setTitle:@" setting View" forState:UIControlStateNormal ];

    [ setingAndProfileView addSubview:profileViewButton ];
    [ setingAndProfileView addSubview:settingButton ];

    return setingAndProfileView;
}

Answer 1

您的代码存在一些问题:

1. 你是如何表达这些观点的？它们是 viewController 类的实例变量吗？
2. 您只需调用 [[UIButton alloc] init] 或 [ UIButton buttonWithType:UIButtonTypeRoundedRect ]。
3. 按钮的框架需要根据父 View 进行设置，因此无需考虑它的框架。

它应该是这样的(假设已经声明了值):

-( UIView * )viewForProfileAndSettingButton 
{
    setingAndProfileView=[[ UIView alloc ]initWithFrame:CGRectMake(0,_listView.frame.size.height, _listView.frame.size.width, _listView.frame.size.height/4)];
    setingAndProfileView.backgroundColor=[ UIColor darkGrayColor ];

    profileViewButton =[ UIButton buttonWithType:UIButtonTypeRoundedRect];
    profileViewButton.backgroundColor=[ UIColor whiteColor ];
    [ profileViewButton setTitle:@" profile View" forState:UIControlStateNormal ];
    profileViewButton.frame=CGRectMake(5, 10, setingAndProfileView.frame.size.width/2-50, setingAndProfileView.frame.size.height/2+10);

    settingButton=[ UIButton buttonWithType:UIButtonTypeRoundedRect ];
    settingButton.backgroundColor=[ UIColor whiteColor ];
    settingButton.frame=CGRectMake(profileViewButton.frame.origin.x + profileViewButton.frame.size.width+10, 10, setingAndProfileView.frame.size.width/2-50, setingAndProfileView.frame.size.height/2+10);
    [ settingButton setTitle:@" setting View" forState:UIControlStateNormal ];

    [ setingAndProfileView addSubview:profileViewButton ];
    [ setingAndProfileView addSubview:settingButton ];

    return setingAndProfileView;
}