Question

I tried to change the following code from an if statement into a switch statement but I get an error saying that I need an integer and not an id object.

here’s my switch:

-(void) nearestIndexAfterRotationEnded:(int)index {
NSLog(@"Selected item is: %@", [colorNames objectAtIndex:index]);
statusLabel.text = [NSString stringWithFormat:@"Selected item is: %@", [colorNames objectAtIndex:index]];

switch ([colorNames objectAtIndex:])) {
    case 1:
        [redButton setImage:[UIImage imageNamed:@"Btn1_1.png"] forState:UIControlStateNormal];

        break;

    case 2:
        [redButton setImage:[UIImage imageNamed:@"Btn1_2.png"] forState:UIControlStateNormal];

        break;

    default:
        break;
}

and here’s my if conditional statement:

-(void) nearestIndexAfterRotationEnded:(int)index {
NSLog(@"Selected item is: %@", [colorNames objectAtIndex:index]);
statusLabel.text = [NSString stringWithFormat:@"Selected item is: %@", [colorNames objectAtIndex:index]];


if ([colorNames objectAtIndex:0]) {
    [redButton setImage:[UIImage imageNamed:@"Btn1_1.png"] forState:UIControlStateNormal];

}

if ([colorNames objectAtIndex:1]) {
    [redButton setImage:[UIImage imageNamed:@"Btn1_2.png"] forState:UIControlStateNormal];

}

if ([colorNames objectAtIndex:2]) {
    [redButton setImage:[UIImage imageNamed:@"Btn1_3.png"] forState:UIControlStateNormal];
}

if ([colorNames objectAtIndex:3]) {
    [redButton setImage:[UIImage imageNamed:@"Btn1_4.png"] forState:UIControlStateNormal];
}

if ([colorNames objectAtIndex:4]) {
    [redButton setImage:[UIImage imageNamed:@"Btn1_5.png"] forState:UIControlStateNormal];
}

if ([colorNames objectAtIndex:5]) {
    [redButton setImage:[UIImage imageNamed:@"Btn1_6.png"] forState:UIControlStateNormal];
}

if ([colorNames objectAtIndex:6]) {
    [redButton setImage:[UIImage imageNamed:@"Btn1_7.png"] forState:UIControlStateNormal];
}

if ([colorNames objectAtIndex:7]) {
    [redButton setImage:[UIImage imageNamed:@"Btn1_8.png"] forState:UIControlStateNormal];
}

if ([colorNames objectAtIndex:8]) {
    [redButton setImage:[UIImage imageNamed:@"Btn1_9.png"] forState:UIControlStateNormal];
}

}

thanks for any help

Answer 1

Change it the code 
 switch ([colorNames objectAtIndex:]))
to 
switch (index)  This will be helpful for you.