UIScrollView programmatically add buttons and scroll

Question

I'm new to ios and Objective-C. Please be a little bit patient with me.

THe functionality in my app, which I'm trying to develop, is a small scrolling toolbar, which contains several buttons, state toggling buttons. Also there is another button above the toolbar which slides in and out the toolbar. The second functionality I achieved successfully, using a view for the whole setup and when the slide button touch up event animates the whole view up and down.

For the scrollview, I wanted to add buttons programmatically, hence I drew an outlet to the class and tried adding a self created button as a subview. However I cannot see the button. Nor can I observe the scrollview sliding.

THe following is the way I'm adding the button: Also, my total view for the above functionality is very less in size than the total view controller

UIButton *button = [[UIButton alloc] init];

button.titleLabel.text = @"hello";

[_scrollTop setContentSize:self.view.frame.size];

[_scrollTop addSubview:button];

The two images down, I hope, should help you understand the functionality I'm trying to develop. If anybody is aware of existence of similar functionality, please do direct me.

Edit: Code totally is

    //
//  HCILocationViewController.m
//  app2
//
//  Created by Ravi Vooda on 13/03/13.
//  Copyright (c) 2013 housing.co.in. All rights reserved.
//

#import "HCILocationViewController.h"
#import "HCIAnnotationViewController.h"

@interface HCILocationViewController ()

@property int widMap;
@property BOOL showExploreOptions;


@end

@implementation HCILocationViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    _mapLocationView.delegate = self;
    MKPointAnnotation *annotation = [[HCIAnnotationViewController alloc]
                                     initwithHouse:[self singleHome]];
    [_mapLocationView addAnnotation:annotation];
    _widMap = 10000;

    _showExploreOptions = NO;

    /*
     UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [button addTarget:self
               action:@selector(aMethod:)
     forControlEvents:UIControlEventTouchDown];
    [button setTitle:@"Show View" forState:UIControlStateNormal];
    button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);//give values whatever you want.
    [_scrollTop addSubview:button];
    */
    [self addButtonsToScrollView];

}

- (void)addButtonsToScrollView
{
    NSInteger buttonCount = 4;

    CGRect buttonFrame = CGRectMake(5.0f, 5.0f, self.scrollTop.frame.size.width-10.0f, 40.0f);

    for (int index = 0; index <buttonCount; index++) {
        UIButton *button = [[UIButton alloc]initWithFrame:buttonFrame];
        [button addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
        [button setTag:index+1];

        NSString *title = [NSString stringWithFormat:@"Button %d",index+1];
        [button setTitle:title forState:UIControlStateNormal];

        [self.scrollTop addSubview:button];
        buttonFrame.origin.y+=buttonFrame.size.height+5.0f;
    }

    CGSize contentSize = self.scrollTop.frame.size;
    contentSize.height = buttonFrame.origin.y;
    [self.scrollTop setContentSize:contentSize];

}

- (void)buttonPressed:(UIButton *)button
{
    NSLog(@"button pressed");

    switch (button.tag) {
        case 1:
            //Do something
            break;

        default:
            break;
    }
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(MKAnnotationView*) mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {
    NSString *identifier = @"currDetailsIdentifier";
    MKPinAnnotationView *annotationView = (MKPinAnnotationView *)[_mapLocationView dequeueReusableAnnotationViewWithIdentifier:identifier];

    if (annotationView == nil) {
        annotationView = [[MKPinAnnotationView alloc]
                          initWithAnnotation:annotation
                          reuseIdentifier:identifier];
    } else {
        annotationView.annotation = annotation;
    }

    annotationView.enabled = YES;
    annotationView.canShowCallout = YES;
    return annotationView;
}

-(void) mapViewDidFinishLoadingMap:(MKMapView *)mapView
{

    MKMapRect zoomRect = MKMapRectNull;
    for (id <MKAnnotation> annotation in mapView.annotations) {
        MKMapPoint annotationPoint = MKMapPointForCoordinate(annotation.coordinate);
        MKMapRect pointRect = MKMapRectMake(
                                            annotationPoint.x - (_widMap / 2),
                                            annotationPoint.y - (_widMap/2),
                                            _widMap,
                                            _widMap);
        if (MKMapRectIsNull(zoomRect)) {
            zoomRect = pointRect;
        } else {
            zoomRect = MKMapRectUnion(zoomRect, pointRect);
        }
    }
    [mapView setVisibleMapRect:zoomRect animated:YES];
}

-(void) setMyHouse:(NSDictionary *)singleHouse {
    self.singleHome = singleHouse;
}


- (IBAction)toggleExploreOptionsView:(UIButton *)sender {

    sender.selected = !sender.selected;

    if (_showExploreOptions){
        NSLog(@"Close Options");
        [UIView animateWithDuration:0.2 animations:^{
            _exploreView.frame = CGRectMake(_exploreView.frame.origin.x, _exploreView.frame.origin.y + _exploreOptionsView.frame.size.height, _exploreView.frame.size.width, _exploreView.frame.size.height + _exploreOptionsView.frame.size.height);
        }];
    }
    else {
        NSLog(@"Open Options");
        [UIView animateWithDuration:0.2 animations:^{
            _exploreView.frame = CGRectMake(_exploreView.frame.origin.x, _exploreView.frame.origin.y - _exploreOptionsView.frame.size.height, _exploreView.frame.size.width, _exploreView.frame.size.height - _exploreOptionsView.frame.size.height);
        }];
    }
    _showExploreOptions = !_showExploreOptions;
}
@end

Answer 1

If I understood your question correctly you need to have view which should show up and collapse on a button click event. When the view is shown, it should have a scrollable list of buttons. And you are asking help to show many buttons to scrollView.

Demo Source Code

- (void)addButtonsToScrollView
{
    NSInteger buttonCount = 5;

    CGRect buttonFrame = CGRectMake(5.0f, 5.0f, self.scrollTop.frame.size.width-10.0f, 40.0f);

    for (int index = 0; index <buttonCount; index++) {
        UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        [button setFrame:buttonFrame];
        [button addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
        [button setTag:index+1];

        NSString *title = [NSString stringWithFormat:@"Button %d",index+1];
        [button setTitle:title forState:UIControlStateNormal];

        [self.scrollTop addSubview:button];
        buttonFrame.origin.y+=buttonFrame.size.height+5.0f;
    }

    CGSize contentSize = self.scrollTop.frame.size;
    contentSize.height = buttonFrame.origin.y;
    [self.scrollTop setContentSize:contentSize];

}

- (void)buttonPressed:(UIButton *)button
{
    switch (button.tag) {
        case 1:
            //Do something
            break;

        default:
            break;
    }
}