Question

我希望图片在用户触摸它的第二个时间变黄。现在，在第一次点击时，图像变为灰色，释放时变为黄色。第二次点击图片会立即回到红色。我该如何解决这个问题？

-(void)bMethod:(UIButton*)sender
{
    sender.selected = !sender.selected;    
}

- (void)viewDidLoad
{        
    [super viewDidLoad];
    UIButton *myButton = [UIButton buttonWithType:UIButtonTypeCustom];
    UIImage *buttonImage = [UIImage imageNamed:@"red.png"];
    UIImage *buttonImageSelected = [UIImage imageNamed:@"yellow.png"];
    myButton.frame = CGRectMake(200, 200, 40, 40);
    [myButton addTarget:self action:@selector(bMethod:) forControlEvents:UIControlEventTouchDown];
    [myButton setImage:buttonImage forState:UIControlStateNormal];
    [myButton setImage:buttonImageSelected forState:UIControlStateSelected];
    [myButton setImage:buttonImageSelected forState:UIControlStateHighlighted];
    [self.view addSubview:myButton];

Answer 1

我运行了你的代码，它的工作很好。只需仔细检查图像名称！

编辑1：

用以下代码替换您的代码：

    -(void)bMethod:(UIButton*)sender
{
    if (sender.imageView.image != [UIImage imageNamed:@"red.png"]){
        [sender setImage:[UIImage imageNamed:@"yellow.png"] forState:UIControlStateHighlighted];
        [sender setImage:[UIImage imageNamed:@"yellow.png"] forState:UIControlStateNormal];
    }
    else{
        [sender setImage:[UIImage imageNamed:@"red.png"] forState:UIControlStateHighlighted];
        [sender setImage:[UIImage imageNamed:@"red.png"] forState:UIControlStateNormal];
    }    
}

- (void)viewDidLoad
{        
    [super viewDidLoad];
    UIButton *myButton = [UIButton buttonWithType:UIButtonTypeCustom];
    UIImage *buttonImage = [UIImage imageNamed:@"red.png"];
    myButton.frame = CGRectMake(200, 200, 40, 40);
    [myButton addTarget:self action:@selector(bMethod:) forControlEvents:UIControlEventTouchDown];
    [myButton setImage:buttonImage forState:UIControlStateNormal];
    [self.view addSubview:myButton];
}

编辑2：

-(void)bMethod:(UIButton*)sender
{
    sender.selected = !sender.selected;
    sender.highlighted = !sender.highlighted;  
}

- (void)viewDidLoad
{        
    [super viewDidLoad];
    UIButton *myButton = [UIButton buttonWithType:UIButtonTypeCustom];
    UIImage *buttonImage = [UIImage imageNamed:@"red.png"];
    UIImage *buttonImageSelected = [UIImage imageNamed:@"yellow.png"];
    myButton.frame = CGRectMake(200, 200, 40, 40);
    [myButton addTarget:self action:@selector(bMethod:) forControlEvents:UIControlEventTouchUpInside];
    myButton.adjustsImageWhenHighlighted = NO;
    [myButton setImage:buttonImage forState:UIControlStateNormal];
    [myButton setImage:buttonImageSelected forState:UIControlStateSelected];
    [myButton setImage:buttonImageSelected forState:UIControlStateHighlighted];
    [self.view addSubview:myButton];
}

当HighLighted时，UIButton不会改变图片，只会将图片设置为灰色

1 个答案: