iOS uilabel text cross view - ios

Question

I am doing a countdown apps with storyboard and navigation controller with 2 view controller
"A" controller is with UILABEL showing how many days
and "B" Controller is a date picker with button below is the code from "B" controller
- (IBAction)doneSetting:(id)sender
{
//Remove the time component from the datePicker. We care only about the date
NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar];
NSUInteger preservedComponents = (NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit);
self.datePicker.date = [calendar dateFromComponents:[calendar components:preservedComponents fromDate:self.datePicker.date]];
//Set up a timer that calls the updateTime method every second to update the label
NSTimer *timer;
timer = [NSTimer scheduledTimerWithTimeInterval:1.0
target:self
selector:#selector(updateTime)
userInfo:nil
repeats:YES];
}
-(void)updateTime
{
//Get the time left until the specified date
NSInteger ti = ((NSInteger)[self.datePicker.date timeIntervalSinceNow]);
NSInteger days = (ti / 86400);
//Update the lable with the remaining time
self.countdownLabel.text = [NSString stringWithFormat:#"%02i days", days];
}
how do I get the countdownlabel.text to appear on "A" Controller?
Thanks in advance

Answer 1

Try this:
//======= in controller B =====
Declare property in Controller "B" in .h file:
#property (nonatomic, copy) void (^LabelTextUpdated)(NSString *textValue);
and in .m of B in your source code:
-(void)updateTime
{
//Get the time left until the specified date
NSInteger ti = ((NSInteger)[self.datePicker.date timeIntervalSinceNow]);
NSInteger days = (ti / 86400);
//Update the lable with the remaining time
self.countdownLabel.text = [NSString stringWithFormat:#"%02i days", days];
if (_LabelTextUpdated) {
_LabelTextUpdated(#"Value");
}
}
//========== And in controller "A" ===========
from where you are pushing controller "B" write this:
B *object_B = YOUR_OBJECT_OF_B;
[object_B setLabelTextUpdated:^(NSString *textValue) {
//Here you will receive updated text
NSLog(#"Your Text is %#", textValue);
}];
//Push your B controller.