Question

how to set multiple buttons in UIScrollView and also how to set clicked action for particular button index?

Answer 1

you can call this(initScrollView) method on viewDidLoad

- (void)viewDidLoad { 

arrayScrollViewImages = [[NSArray alloc] initWithObjects:
     [[MyKeyValuePair alloc] initWithKey:@"imagename1" withValue:@"imagename1.png"],
     [[MyKeyValuePair alloc] initWithKey:@"imagename2" withValue:@"imagename2.png"],nil];


[self initScrollView];

}

here arrayScrollViewImages is NSArray

- (void) initScrollView
 {

    int width = 10;
    for (int index = 0; index < [arrayScrollViewImages count]; index++) {
        MyKeyValuePair *pair = [arrayScrollViewImages objectAtIndex:index];
        UIImage *image = [UIImage imageNamed:pair.value];
        UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
        [button setFrame:CGRectMake(width, 2, 34, 34)];
        [button setBackgroundImage:image forState:UIControlStateNormal];
        [button setTag:index];
        [button addTarget:self action:@selector(scrollViewButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
        if (index == 0) {
            [button setBackgroundColor:[UIColor colorWithRed:0.59 green:0.38 blue:0.21 alpha:1.00]];
        }

        [scrollView addSubview:button];
        width += 45;
    }

    scrollView.contentSize = CGSizeMake(width, 48);
    scrollView.contentOffset = CGPointMake(0, 0);
}


- (void) scrollViewButtonTapped:(id)sender {
    for (UIButton *b in scrollView.subviews) {
        if ([b isKindOfClass:[UIButton class]]) {
            [b setBackgroundColor:[UIColor clearColor]];
        }
    }

    UIButton *button = (UIButton *) sender;
    [button setBackgroundColor:[UIColor colorWithRed:0.59 green:0.38 blue:0.21 alpha:1.00]];
    MyKeyValuePair *pair = [arrayScrollViewImages objectAtIndex:button.tag];
    labelEspecialidad.text = pair.key;
}

here MyKeyValuePair is a one class
*MyKeyValuePair.h*

@interface MyKeyValuePair : NSObject {
    NSString *key;
    NSString *value;
}

// Properties
@property (nonatomic, retain) NSString *key;
@property (nonatomic, retain) NSString *value;

@end

MyKeyValuePair.m

@implementation MyKeyValuePair
@synthesize key, value;

- (id) initWithKey: (NSString *) _key withValue: (NSString *) _value {
    if (self = [super init]) {
        self.key = _key;
        self.value = _value;
    }

    return self;
}

- (void) dealloc {
    [super dealloc];
    [self.key release];
    [self.value release];
}

@end