如何使用switch语句更改UIButton的图像？

Question

I was able to add a "setbackgroundimage" to my UIButton in my array. Now all buttons have the same image. How do I create a switch statement to be able to set a different image for each initwithobjects @"" in my NSarray?

Below is the code I'm using:

 menuItems = [[NSArray alloc]initWithObjects:@"",@"",@"",@"",@"",@"",@"", nil];
    for (int b=0;b<[menuItems count];b++) {

        UIButton *mybutton = [[UIButton alloc]initWithFrame:CGRectMake(3.0f, originofButtons, buttonWidth, buttonHeight)];
        //mybutton.backgroundColor = [UIColor redColor];
        [mybutton setBackgroundImage:[UIImage imageNamed:@"menubutton.png"]
         forState:UIControlStateNormal];
        [mybutton setTag:b];
        [mybutton setTitle:[menuItems objectAtIndex:b] forState:UIControlStateNormal];
        [mybutton setSelected:false];
        [mybutton addTarget:self action:@selector(buttonpress:) forControlEvents:UIControlEventTouchUpInside];

        [m_scrollview addSubview:mybutton];

        originofButtons += (buttonHeight + buttonseparator); 
        }

Answer 1

To set the image for selected:

[mybutton setBackgroundImage:[UIImage imageNamed:@"YOUR_SELECTED_IMG.png"] forState:UIControlStateSelected];

Whereas you want to set different each, you can link tag .

switch (myButton.tag) {
        case 0:
            [mybutton setBackgroundImage:[UIImage imageNamed:@"YOUR_SELECTED_IMG.png"] forState:UIControlStateSelected];
            break;
        case 1:
            [mybutton setBackgroundImage:[UIImage imageNamed:@"YOUR_SELECTED_IMG.png"] forState:UIControlStateSelected];
            break;
    }

Answer 2

This can be help you for your scenario. You can add your button image name in NSArray and then set image for each case using the below code snippet:

NSArray*  menuItems = [[NSArray alloc]initWithObjects:@"FirstScreen",@"SecondScreen",@"ThridScreen", nil];

for (int b=0;b<[menuItems count];b++) {

    UIButton *mybutton = [[UIButton alloc]init ];//WithFrame:CGRectMake(3.0f, originofButtons, buttonWidth, buttonHeight)];
    [mybutton setBackgroundImage:[UIImage imageNamed:[menuItems[b] stringByAppendingString:@".png"]] forState:UIControlStateSelected]; 

Answer 3

i am hoping this will be helpful to you according to your requirements.....

menuItems = [[NSArray alloc]initWithObjects:@"",@"",@"",@"",@"",@"",@"", nil];
for (int b=0;b<[menuItems count];b++) {

    UIButton *mybutton = [[UIButton alloc]initWithFrame:CGRectMake(3.0f, originofButtons, buttonWidth, buttonHeight)];
    //mybutton.backgroundColor = [UIColor redColor];
    [mybutton setBackgroundImage:[self getImageFromIndex:b %4]
     forState:UIControlStateNormal];
    [mybutton setTag:b];
    [mybutton setTitle:[menuItems objectAtIndex:b] forState:UIControlStateNormal];
    [mybutton setSelected:false];
    [mybutton addTarget:self action:@selector(buttonpress:) forControlEvents:UIControlEventTouchUpInside];

    [m_scrollview addSubview:mybutton];

    originofButtons += (buttonHeight + buttonseparator);



    }


-(UIImage *) getImageFromIndex:(short) index
{
switch (index) {
    case 0:
        return [UIImage imageNamed:@"card_01.png"];
        break;
    case 1:
        return [UIImage imageNamed:@"card_02.png"];
        break;
    case 2:
        return [UIImage imageNamed:@"card_03.png"];
        break;
    case 3:
        return [UIImage imageNamed:@"card_04.png"];
        break;

    default:
        return [UIImage imageNamed:@"card_01.png"];
        break;
}
return nil;
}