Set button title programmatically - ios

Question

I made a button in storyboard and associated it with an IBAction in my header file. How can I set the title of this button to the variable I made displayPhone and have it call that number as well?
.h
#import <UIKit/UIKit.h>
#import <Parse/Parse.h>
#interface IBThirdViewController : UIViewController
#property (nonatomic, strong) PFRelation *agentRelation;
#property (nonatomic, strong) NSArray *agent;
#property (weak, nonatomic) IBOutlet UILabel *agentName;
#property (strong, nonatomic) IBOutlet UILabel *agentPhone;
#property (strong, nonatomic) IBOutlet UILabel *agentEmail;
#property (strong, nonatomic) IBOutlet UIImageView *agentImage;
- (IBAction)phoneButton:(id)sender;
#end
.m
#import "IBThirdViewController.h"
#import "IBAgentsTableViewController.h"
#interface IBThirdViewController ()
#end
#implementation IBThirdViewController
- (void)viewDidLoad {
[super viewDidLoad];
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
//Find the Agent and show it
self.agentRelation = [[PFUser currentUser] objectForKey:#"agentRelation"];
PFQuery *query = [self.agentRelation query];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
// success
self.agent = objects;
// Do something with the found objects
for (PFObject *object in objects) {
NSLog(#"name: %#", [object objectForKey:#"name"]);
NSLog(#"email: %#", [object objectForKey:#"email"]);
NSString *displayEmail = [object objectForKey:#"email"];
NSString *displayName = [object objectForKey:#"name"];
NSString *displayPhone = [object objectForKey:#"phone"];
PFFile *thumbnail = [object objectForKey:#"profilePic"];
NSURL *imageFileURL = [[NSURL alloc] initWithString:thumbnail.url];
NSData *imageData = [NSData dataWithContentsOfURL:imageFileURL];
self.agentEmail.text = displayEmail;
self.agentName.text = displayName;
self.agentPhone.text = displayPhone;
self.agentImage.image = [UIImage imageWithData:imageData];
}
} else {
// Log details of the failure
NSLog(#"Error: %# %#", error, [error userInfo]);
}
}];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"showEditAgent"]) {
IBAgentsTableViewController *viewController = (IBAgentsTableViewController *)segue.destinationViewController;
viewController.agents = [NSMutableArray arrayWithArray:self.agent];
}
}
- (IBAction)phoneButton:(id)sender {
}
#end

Answer 1

First of all you need connect button from xib with IBOutlet object:
#property (nonatomic, weak) IBOutlet UIButton *displayPhone;
Then set it's title in -(void)viewDidAppear:(BOOL)animated after loading data:
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
//...
// Load data here
//...
[self.displayPhone setTitle:displayPhone forState:UIControlStateNormal];
}
Finally implement IBAction method for button:
- (IBAction)phoneButton:(id)sender {
NSString *phone = [sender titleForState:UIControlStateNormal];
// Remove all chars except of digits
static NSString *const kDigitsString = #"0123456789";
phone = [[phone componentsSeparatedByCharactersInSet:[[NSCharacterSet characterSetWithCharactersInString:kDigitsString] invertedSet]] componentsJoinedByString:#""];
// Initiate call
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:[NSString stringWithFormat:#"tel:%#", phone]]];
}

Answer 2

It looks like you haven't connected the button to an outlet but only to an action.
First you need to connect it to an outlet (like you've done with the labels).
Then use...
[self.button setTitle:#"blah" forState:UIViewControlStateNormal];
Something like that anyway. I'm currently on my iPhone so I don't have auto complete.

Answer 3

If you want to change the title inside the IBAction method do:
[sender setTitle:#"My title" forState:UIControlStateNormal];
If you want to change in any other place you need a #property of uibutton, something like this
#property (strong, nonatomic) IBOutlet UIButton *phoneButtonProperty;
and connect it to your button and then
[phoneButtonProperty setTitle:#"My title" forState:UIControlStateNormal];