Question

How would I go about dynamically adjusting the height of a UIScrollView? Basically I have a bunch of UILabels that are created (the exact number of UILabels is random) and the UIScrollView is to adjust its height automatically to accommodate the UILables. This is what I have thus far in the viewDidLoad.

- (void)viewDidLoad
{
[scroller setScrollEnabled:YES];
[scroller setContentSize:CGSizeMake(320
                                    , 1500)];
scroller.indicatorStyle = UIScrollViewIndicatorStyleWhite;
{ 

And this is the action that creates additional UILavels

-(IBAction)scheduale{
int i;
for(i=0; i<[self retrieveTime] ; i++){
    //Add time label
    UILabel *timeLabel = [[UILabel alloc] init];
    timeLabel.frame = CGRectMake(10, (i+1) * 21, 31, 20);
    timeLabel.textColor = [UIColor whiteColor];
    timeLabel.backgroundColor = [UIColor colorWithRed:76.0/225.0 green:76.0/225.0 blue:76.0/225.0 alpha:1.0];
    NSString *labelString;
    labelString = [[NSNumber numberWithInt:i] stringValue];
    timeLabel.text = labelString;
    timeLabel.textAlignment = UITextAlignmentCenter;
    //theLabel.tag = (i+1) * 100;
    [scroller addSubview:timeLabel];
}

Answer 1

You need to hold onto a variable to keep track of how many labels you are adding and their height to set the content size when you are done creating labels. See adjusted code below:

-(IBAction)scheduale{

 int i; 
 int contentSize = 0;

 for(i=0; i<[self retrieveTime] ; i++){

     UILabel *timeLabel = [[UILabel alloc] init];
     timeLabel.frame = CGRectMake(10, (i+1) * 21, 31, 20);
     contentSize += 20;
     timeLabel.textColor = [UIColor whiteColor];
     timeLabel.backgroundColor = [UIColor colorWithRed:76.0/225.0 green:76.0/225.0 blue:76.0/225.0 alpha:1.0];
     NSString *labelString;
     labelString = [[NSNumber numberWithInt:i] stringValue];
     timeLabel.text = labelString;
     timeLabel.textAlignment = UITextAlignmentCenter;
     //theLabel.tag = (i+1) * 100;
     [scroller addSubview:timeLabel]; }

 [scroller setContentSize:CGSizeMake(320, contentSize)];