Passing Data Through ViewControllers Not Working - ios

Question

Ok so I am trying to pass data from one view controller to another via the following code but its not working and I have no idea why.
In my ViewController.m I have imported ViewControllerTwo.h and declared ViewControllerTwo:
#import "ViewController.h"
#import "ViewControllerTwo.h"
#interface ViewController ()
#end
#implementation ViewController
{
ViewControllerTwo *settings;
}
#synthesize blockSizeLB;
#synthesize wpmLB;
#synthesize textTV;
#synthesize slider;
#synthesize stepper;
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//sets label to corresponding value
wpmLB.text = [NSString stringWithFormat:#"WPM: %#", [[NSNumber numberWithInt:slider.value] stringValue]];
//configure stepper and its label to default values of 1
stepper.value = 1;
blockSizeLB.text = [NSString stringWithFormat:#"Block Size: %#", [[NSNumber numberWithInt:stepper.value] stringValue]];
//sets properties for next ViewController
settings = [[ViewControllerTwo alloc] init];
settings.timerValue = 60 / slider.value;
settings.text = textTV.text;
settings.blockCount = stepper.value;
}
In ViewControllerTwo.h I have:
#property (nonatomic) float timerValue;
#property (nonatomic) NSString * text;
#property (nonatomic) int blockCount;
Later on in the ViewController.m I need to change the properties defined in ViewControllerTwo:
Method from ViewController.m. This is also done earlier in my viewDidLoad to set the default values of the properties:
- (IBAction)sliderSlide:(id)sender
{
//event when the slider value is changed
//rounds value to nearest increment of 5
int increment = 5 * floor(((int)slider.value/5)+0.5);
[slider setValue:increment animated:YES];
//changes WPM: 0 label text
wpmLB.text = [NSString stringWithFormat:#"WPM: %#", [[NSNumber numberWithInt:increment] stringValue]];
//sets properties for next ViewController
settings.timerValue = 60 / slider.value;
}
I try to test if this is successful by calling a method in ViewControllerTwo.m that logs its property blockCount via NSLog. The output however is (null) meaning I was unsuccesful in passing the data from ViewController.m to ViewControllerTwo

Answer 1

If you are using segues, you should be doing this inside of:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
Then name your segue, then do something like this:
if([segue.identifier isEqual: #"segue_From_1_To_2"])
{
ViewControllerTwo *vc2 = segue.destinationViewController;
vc2.timerValue = 123.45;
vc2.text = #"whatever";
vc2.blockCount = 1;
}

Answer 2

You can create a custom initializer in your viewControllerTwo. name it initWithTimerValue:
- (id)initWithTimerValue:(CGFloat)timerValue
{
self = [super init];
if (self) {
self.timerValue = timerValue;
}
return self;
}