iphone - 每次在iPhone中点击按钮时都会更改按钮的背景图像？

Question

我有一个 iPhone 应用程序，我想在每次点击按钮时更改按钮的背景图像，即如果它跟随它，则在点击它时需要取消关注，反之亦然。有人可以帮我吗？

Answer 1

如果您想使用按钮作为切换按钮而不是使用标志（BOOL）变量并根据您的要求进行设置。但是，如果您不止一次设置按钮图像而不是使用它，如下所示。

-(IBAction)buttonPress:(id)sender
{ 

   if([sender tag] == 1)
        {
            [yourbutton setBackgroundImage:[UIImage imageNamed:@"1.png"] forState:UIControlStateNormal];
            btnSegment1.tag = 2;// Here i reset tag. you can set tag according your requirements so you can use button next for next click as you want

        }
        else if([sender tag] == 2)
        {
            [yourbutton setBackgroundImage:[UIImage imageNamed:@"3.png"] forState:UIControlStateNormal];
             yourbutton.tag = 3;// Here i reset tag. you can set tag according your requirements so you can use button next for next click as you want

        }
    // and so on.....

}

Answer 2

@interface XXX: UIViewController // whatever
{
    BOOL btnImageState;
}

// etc.

@implementation XXX

- (id)init
{
    if ((self = [super init]))
    {
        UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        [btn setImage:[UIImage imageNamed:@"follow.png"] forState:UIControlStateNormal];
        [btn setFrame:CGRectMake(x, y, w, h)];
        [btn addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:btn];
    }
    return self;
}

- (void)click:(UIButton *)btn
{
    if (btnImageState)
        [btn setImage:[UIImage imageNamed:@"follow.png"] forState:UIControlStateNormal];
    else
        [btn setImage:[UIImage imageNamed:@"unfollow.png"] forState:UIControlStateNormal];

    btnImageState = !btnImageState;
}

@end

Answer 3

在这里，我以编程方式完成了它。希望这会帮助你。

-(IBAction) pause:(id)sender
{
UIButton  *button1 = [UIButton buttonWithType:UIButtonTypeCustom];
[button1 addTarget:self 
           action:@selector(aMethod)
 forControlEvents:UIControlEventTouchDown];
UIImage *buttonImage = [UIImage imageNamed:@"buttonImage.png"];
[button1 setBackgroundImage:buttonImage forState:UIControlStateNormal];
button1.frame = CGRectMake(208, 380.0, 60.0, 60.0);
[self.view addSubview:button1];
}
- (IBAction) aMethod
{
button1.hidden=YES;

UIButton *button1 = [UIButton buttonWithType:UIButtonTypeCustom];
[button1 addTarget:self 
            action:@selector(pause:)
  forControlEvents:UIControlEventTouchDown];
UIImage *buttonImage = [UIImage imageNamed:@"Button2Image.png"];
[button1 setBackgroundImage:buttonImage forState:UIControlStateNormal];
//[button1 setTitle:nil forState:UIControlStateNormal];
button1.frame = CGRectMake(208, 380.0, 60.0, 60.0);
[self.view addSubview:button1];
}

Answer 4

 static int tapCount = 0;
- (IBAction) buttonTapped :(id)sender {
    tapCount++;

    NSString *imageName = [NSString stringWithFormat:@"image%d.png",tapCount];
    [yourButton setImage:[UIImage imageNamed:imageName] forState:UIControlStateNormal];
}

这将取决于您如何加载具有什么名称和图像数量的图像。因此，您可以自定义。