Question

我和NSUserDefaults一起使用，即使它不是我要求的意思如果我在该按钮上单击一次，它应该将颜色更改为“绿色”，如果我再按一次它应该将颜色更改为黑色....

这里我的代码是......

- (IBAction)subscribeButtonAction:(id)sender {

    if (count == 0) {
        [_subscribeButtonObj setBackgroundColor:[UIColor greenColor]];
        greenStr=[NSString stringWithFormat:@"green"];
        NSUserDefaults *greendefults=[NSUserDefaults standardUserDefaults];
        [greendefults setValue:greenStr forKey:@"greencolor"];
        [greendefults synchronize];


        ///

        count++;
    }else if(count == 1){
        [_subscribeButtonObj setBackgroundColor:[UIColor blueColor]];
        blackStr=[NSString stringWithFormat:@"black"];
        NSUserDefaults *blackDefaults=[NSUserDefaults standardUserDefaults];
        [blackDefaults setValue:blackStr forKey:@"blackcolor"];
        [blackDefaults synchronize];
        //count = 0;
    }

}

在ViewWillAppear中我写了像这样的代码......

-(void)viewWillAppear:(BOOL)animated
{

    //count = 0;



    if ([[NSUserDefaults standardUserDefaults]
         stringForKey:@"greencolor"]) {

        NSLog(@"change the button to green color %@",[[NSUserDefaults standardUserDefaults]
                                                      stringForKey:@"greencolor"]);

    }
    else

    {

        NSLog(@"change the button to blackcolor ");
    }
}

Answer 1

您可以创建一个int属性来检查按钮的状态并将其递增。

所以，这是我的viewController.h的样子：

#import <UIKit/UIKit.h>

enum clickedTimes{
    neverClicked,
    clickedOnce,
    clickedTwice
};

@interface ViewController : UIViewController

@property int cTimes;
@property (weak, nonatomic) IBOutlet UIButton *myButton;

- (IBAction)changeColour:(id)sender;

@end

我只是创建一个枚举来表示状态，并创建按钮插座，也是它的动作。

我的viewController.m：

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
//Init the _cTimes property
    _cTimes = neverClicked;
}

- (IBAction)changeColour:(id)sender {
    switch (_cTimes) {
        case neverClicked:
            _myButton.tintColor = [UIColor greenColor];
            _cTimes++;
            break;
        case clickedOnce:
            _myButton.tintColor = [UIColor blackColor];
            _cTimes++;
            break;
        default:
            break;
    }
}

希望它有所帮助。：）

Answer 2

在你的头文件中写： -

@property (weak, nonatomic) IBOutlet UIButton *myBtn;

- (IBAction)onTapBtn:(id)sender;

在你的.m文件中合成它： -

@synthesize myBtn;

然后，

-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];

    [myBtn setBackgroundColor:[UIColor grayColor]];
    count = 0;
}

- (IBAction)onTapBtn:(id)sender {

    if (count == 0) {
        [myBtn setBackgroundColor:[UIColor greenColor]];
        count++;
    }else if(count == 1){
        [myBtn setBackgroundColor:[UIColor blueColor]];
        count = 0;
    }
}

多数民众赞成，

您可以根据需要更改颜色以及您想要的点击次数，希望它能帮助您，除此之外您可以问我：）

Answer 3

希望这会对你有所帮助

如果您通过.xib文件创建，则执行类似

的操作事件

- (IBAction)changeColor:(UIButton *)sender {

    if (sender.isSelected == NO)
    {
        sender.selected =YES;
        sender.backgroundColor = [UIColor greenColor];
    }
    else
    {
         sender.selected =NO;
        sender.backgroundColor = [UIColor blackColor];
    }


}

如果你以编程方式制作

UIButton *btn  = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 25, 25)];

[btn addTarget:self action:@selector(changeColor:) forControlEvents:UIControlEventTouchUpInside];

并实现上述方法。

Answer 4

按钮操作

- (IBAction)didTapButton:(id)sender {
    UIButton *btn = (UIButton *)sender;
    if (btn.isSelected == NO)
    {
        btn.selected =YES;
        btn.backgroundColor = [UIColor greenColor];
    }
    else
    {
        btn.selected =NO;
        btn.backgroundColor = [UIColor blackColor];
    }
}

Button按两次颜色的方式应该如何改变

4 个答案: