UIButton未添加在UIView上

Question

在这里我试图在viewforprofileandsetting视图上添加两个按钮，但是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. 您如何宣布这些观点的？ 它们是viewController类的实例变量吗？
2. 您只需要调用[[UIButton alloc] init]或[ UIButton buttonWithType:UIButtonTypeRoundedRect ] 。
3. 按钮的框架需要相对于超级视图进行设置，因此无需考虑其框架。

这是它的外观（假设值已经声明）：

-( 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;
}