ios - 如何更改以编程方式创建的一组 UIButton 的标题颜色？

Question

在我的应用中，我使用 for 循环以编程方式创建了几个按钮，如下所示。它用于水平选项卡菜单/p>

在 action 中，我必须突出显示所选按钮(并使其余按钮标题变灰)。如何做到这一点？它应该看起来几乎像下图一样。

When a button is clicked,the clicked button title color should be white and all other buttons should have a grey color.I know I can access sender.titlecolor in the button action.But What about the other buttons?

 -(void)createButtons
 {
     float buttonMinX=10;
     float  buttonMinY=0;
     scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, _tabViewBackground.frame.size.width, _tabViewBackground.frame.size.height)];
     ButtonIndex=0;
     scrollView.showsHorizontalScrollIndicator = NO;
     [_tabViewBackground addSubview:scrollView];

     for (int i=0; i<_tabItemsListArray.count; i++)
     {
         UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
         button.tintColor=[UIColor whiteColor];
         button.titleLabel.lineBreakMode = NSLineBreakByWordWrapping;
         button.titleLabel.numberOfLines = 1;
         button.tag=i;
         [button addTarget:self action:@selector(action:) forControlEvents:UIControlEventTouchUpInside];
         UIFont *font1 = [UIFont fontWithName:@"HelveticaNeue-Thin" size:20.0f];
         NSMutableParagraphStyle *style = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
         [style setAlignment:NSTextAlignmentCenter];
         NSDictionary *dict1 = @{NSUnderlineStyleAttributeName:@(NSUnderlineStyleNone),
                                    NSFontAttributeName:font1,
                                    NSParagraphStyleAttributeName:style};
         NSMutableAttributedString *attString = [[NSMutableAttributedString alloc] init];
         [attString appendAttributedString:[[NSAttributedString alloc] initWithString:[_tabItemsListArray objectAtIndex:i]  attributes:dict1]];
         [button setAttributedTitle:attString forState:UIControlStateNormal];


         buttonWidth= [self getWidthOfRect:button.titleLabel];
         button.frame = CGRectMake(buttonMinX,buttonMinY,buttonWidth,_tabViewBackground.frame.size.height);
         buttonMinX+=buttonWidth+05;

         sublayer = [[UIView alloc]init];
         sublayer.backgroundColor = [UIColor greenColor];
         sublayer.tag=kButtonSelectrorTag+i;
         sublayer.frame = CGRectMake(button.frame.origin.x,button.frame.size.height-2, button.frame.size.width,2);
         [scrollView addSubview:sublayer];

         sublayer.hidden=YES;
         if (ButtonIndex==i) 
         {
             sublayer.hidden=NO;
         }

         button.backgroundColor=[UIColor clearColor];
         [scrollView addSubview:button];
    }
    scrollView.backgroundColor = [UIColor blueColor];

    scrollView.contentSize = CGSizeMake(buttonMinX+10,_tabViewBackground.frame.size.height);
}

-(CGFloat)getWidthOfRect:(UILabel*)titleLabel
{
    CGFloat widthIs =[titleLabel.text boundingRectWithSize:titleLabel.frame.size options:NSStringDrawingUsesDeviceMetrics attributes:@{ NSFontAttributeName:titleLabel.font }context:nil].size.width;
        widthIs = ceilf(widthIs);
    //  NSLog(@"the width of yourLabel is %f", widthIs);
    return widthIs+30;
}

- (void)action:(UIButton*)sender
{
    for (int i=0; i<_tabItemsListArray.count; i++) 
    {
        UIView *tabSelector = (UIView *)[self.view viewWithTag:kButtonSelectrorTag+i];
        [tabSelector setHidden:YES];
    }
    UIView *tabSelector = (UIView *)[self.view viewWithTag:kButtonSelectrorTag+sender.tag];
    [tabSelector setHidden:NO];
}

我在每个按钮下方都有一个按钮选择器。我应该一次显示一个按钮选择器。使用 action:

中的代码效果很好

Answer 1

我注意到您正在使用 setAttributedTitle:forState:。您可以用相同的方式为标题设置属性，但也可以为 UIControlStateSelected 设置属性。

然后，如果您设置 button.selected = YES; 来自 UIControlStateSelected 的属性将适用。如果您设置 button.selected = NO; 来自 UIControlStateNormal 的属性将适用。

编辑:

您可以像这样创建按钮:

NSInteger numberOfButtons = 10;
NSMutableArray *menuButtonsMutableArray = [[NSMutableArray alloc] initWithCapacity:numberOfButtons];
for (int i = 0; i < numberOfButtons; i++) {
    UIButton *button = [UIButton new];
    //layout your button somehow
    [button setTitleColor:[UIColor whiteColor] forState:UIControlStateSelected];
    [button setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
    [button addTarget:self action:@selector(menuButtonDidTap:) forControlEvents:UIControlEventTouchUpInside];

    [menuButtonsMutableArray addObject:button];
}

self.menuButtonsArray = [menuButtonsMutableArray copy];

然后在action方法中:

- (void)menuButtonDidTap:(UIButton *)sender {
    for (UIButton *button in self.menuButtonsArray) {
        button.selected = (button == sender);
    }
}