ios - 当我们在 ios 中点击它时如何更改 UIbuttons 文本颜色

Question

在我的 ViewController 中，我添加了四个按钮及其相关的指示符 OK

当我点击 button4 然后点击 button4 时，它的指示器颜色必须为黑色，所有其他所有按钮及其指示器颜色必须为白色。当我单击 button2 然后单击 button2 时，文本颜色和指示符必须为黑色。其余按钮的文本颜色和指示器必须为白色，如下图所示

为此，我编写了一些代码，但它不起作用。

你能帮帮我吗

我的代码:-

#import "ViewController12.h"
#import "Masonry.h"

@interface ViewController12 ()
{
    UIView * TabBar;
    UIButton * AllTrips;
    UIButton * OpenTrips;
    UIButton * AssignedTrips;
    UIButton * CompletedTrips;
    UIButton * button;
    UIView * StripView;
    UILabel * label;
}

@end

@implementation ViewController12

- (void)viewDidLoad {

    TabBar = [[UIView alloc]init];
    TabBar.backgroundColor = [UIColor lightGrayColor];
    TabBar.translatesAutoresizingMaskIntoConstraints = NO;
    [self.view addSubview:TabBar];

    [TabBar mas_makeConstraints:^(MASConstraintMaker *make) {

        make.top.equalTo(@0);
        make.left.equalTo(@0);
        make.right.equalTo(@0);
        make.height.equalTo(@100);

    }];

    label = [[UILabel alloc] init];
    label.textAlignment = NSTextAlignmentCenter;
    label.textColor = [UIColor clearColor];
    label.text = @"Hello";
    label.backgroundColor = [UIColor clearColor];
    label.translatesAutoresizingMaskIntoConstraints = NO;
    [TabBar addSubview:label];

    [label mas_makeConstraints:^(MASConstraintMaker *make) {

        make.top.equalTo(@0);
        make.left.equalTo(@10);
        make.right.equalTo(@-10);
        make.height.equalTo(@10);
        make.centerX.equalTo(TabBar);
    }];

    AllTrips = [self createButton:@"All"];
    AllTrips.tag = 1;
    [TabBar addSubview: AllTrips];

    OpenTrips = [self createButton:@"Open"];
    OpenTrips.tag = 2;
    [TabBar addSubview: OpenTrips];

    AssignedTrips = [self createButton:@"Assigned"];
    AssignedTrips.tag = 3;
    [TabBar addSubview: AssignedTrips];

    CompletedTrips = [self createButton:@"Completed"];
    CompletedTrips.tag = 4;
    [TabBar addSubview: CompletedTrips];


    NSDictionary * views = NSDictionaryOfVariableBindings(AllTrips,OpenTrips,AssignedTrips,CompletedTrips);

    [TabBar addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"H:|-5-[AllTrips]-2-[OpenTrips]-2-[AssignedTrips]-2-[CompletedTrips]-5-|"]
                                                                   options:0
                                                                   metrics:nil
                                                                     views:views]];

    [TabBar addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"[AllTrips(==OpenTrips)]" options:0 metrics:nil views:views]];

    [TabBar addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"[OpenTrips(==AssignedTrips)]" options:0 metrics:nil views:views]];

    [TabBar addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"[AssignedTrips(==CompletedTrips)]" options:0 metrics:nil views:views]];


    NSArray * keys = @[@"AllTrips",@"OpenTrips",@"AssignedTrips",@"CompletedTrips"];

    for (NSString * key in keys) {

        [TabBar addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"V:|-50-[%@(50)]",key]
                                                                       options:0
                                                                       metrics:nil
                                                                         views:views]];
    }
}

-(UIButton *)createButton:(NSString*)Title{

    button = [[UIButton alloc] init];
     button.translatesAutoresizingMaskIntoConstraints = NO;
    [button setTitleColor:[UIColor greenColor] forState:UIControlStateNormal];
    [button setTitle:Title forState:UIControlStateNormal];
    [button addTarget:self
               action:@selector(ButtonAction:)
     forControlEvents:UIControlEventTouchUpInside];
    button.backgroundColor = [UIColor orangeColor];

    StripView = [[UIView alloc]init];
    StripView.translatesAutoresizingMaskIntoConstraints = NO;
    StripView.backgroundColor = [UIColor clearColor];
    [button addSubview:StripView];

    NSDictionary * StripDic = NSDictionaryOfVariableBindings(StripView);


    [button addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"H:|-0-[StripView]-0-|"]
                                                                   options:0
                                                                   metrics:nil
                                                                     views:StripDic]];

    [button addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"V:[StripView(5)]-0-|"]
                                                                   options:0
                                                                   metrics:nil
                                                                     views:StripDic]];
    return button;

}

-(void)ButtonAction:(UIButton*)sender{

    if(![sender isSelected]){

        [sender setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        StripView.backgroundColor = [UIColor blackColor];
        sender.selected = YES;
    }
    else{

        [sender setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        StripView.backgroundColor = [UIColor clearColor];
        sender.selected = NO;
    }
}

@end

Answer 1

您可以按以下代码定义 UIButton:

UIButton *btn = [UIButton new];
[btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[btn setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];
[btn setTitleColor:[UIColor redColor] forState:UIControlStateSelected];
[btn setTitleColor:[UIColor grayColor] forState:UIControlStateDisabled];
//etc...