更改TabBar中的选项卡时，UIButtons文本显得更暗

Question

我不知道为什么会遇到这个问题。

详细信息 - 我的应用程序中有一个标签栏控制器。在一个选项卡上，我有一个包含一些按钮的表单。我正在设置这些按钮的标题。现在，当我更改标签并返回相同的标签时，所有按钮标题都显得较暗。

我也附加了屏幕截图。

任何帮助都将不胜感激。

谢谢！

编辑：这是我如何创建按钮的代码 -

-(void)viewWillAppear:(BOOL)animated
{
    float yFrame =310.0f;
            for(int i =0;i<7;i++){

                openPickerButton=[UIButton buttonWithType:UIButtonTypeCustom];
                openPickerButton.frame = CGRectMake(29.0, yFrame+10.0, 280.0, 48.0);
                openPickerButton.tag=i;
                openPickerButton.backgroundColor=[UIColor clearColor];
                [openPickerButton setTitle:[formButtonTitle objectAtIndex:openPickerButton.tag] forState:UIControlStateNormal];

                openPickerButton.titleLabel.font=[UIFont fontWithName:@"Helvetica" size:16];
                [openPickerButton setTitleColor:[UIColor lightGrayColor] forState:UIControlStateNormal];
                openPickerButton.contentHorizontalAlignment=UIControlContentHorizontalAlignmentLeft;
                openPickerButton.showsTouchWhenHighlighted = YES;
                [openPickerButton addTarget:self action:@selector(PickChoreButtonAction:) forControlEvents:UIControlEventTouchUpInside];
                [setPreferencesFormScrollView addSubview:openPickerButton];
                yFrame+=60.0f;
            }
}

Answer 1

而不是在viewWillAppear方法中创建按钮，而不是在viewDidLoad方法中创建按钮

Answer 2

在viewDidLoad中你的对象被调用一次。（一旦视图加载。 停止） 在viewWillAppear中，每次出现视图时都会调用它们。

- (void)viewDidLoad
{
    [super viewDidLoad];
    float yFrame =310.0f;
            for(int i =0;i<7;i++){

                openPickerButton=[UIButton buttonWithType:UIButtonTypeCustom];
                openPickerButton.frame = CGRectMake(29.0, yFrame+10.0, 280.0, 48.0);
                openPickerButton.tag=i;
                openPickerButton.backgroundColor=[UIColor clearColor];
                [openPickerButton setTitle:[formButtonTitle objectAtIndex:openPickerButton.tag] forState:UIControlStateNormal];

                openPickerButton.titleLabel.font=[UIFont fontWithName:@"Helvetica" size:16];
                [openPickerButton setTitleColor:[UIColor lightGrayColor] forState:UIControlStateNormal];
                openPickerButton.contentHorizontalAlignment=UIControlContentHorizontalAlignmentLeft;
                openPickerButton.showsTouchWhenHighlighted = YES;
                [openPickerButton addTarget:self action:@selector(PickChoreButtonAction:) forControlEvents:UIControlEventTouchUpInside];
                [setPreferencesFormScrollView addSubview:openPickerButton];
                yFrame+=60.0f;
            }
}