ios - Programmatically coded UIButton not showing on my view

Question

.

Hello,

I am trying to add a UIButton and other items to my UIViewController programmatically and from what I have read and seen in other SO questions I should be on the right track with this code:

- (void)viewDidLoad
{
[super viewDidLoad];



UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];    
backButton = [[UIButton alloc] init];
backButton = [UIButton buttonWithType:UIButtonTypeCustom];
backButton.frame = CGRectMake(10, 25, 150, 75);
backButton.titleLabel.font = [UIFont fontWithName:@"Helvetica-Bold" size:15];
backButton.titleLabel.text = @"Back"; 
[self.view addSubview:backButton];


// Do any additional setup after loading the view.
}

Now that code is placed in the viewDidLoad Method and it does not appear, which leads me to the question - What am I doing wrong?

When I want to change the color of the background and put in the viewDidLoad it works fine.

Cheers Jeff

Solution 1

I think you may be inserting the button correctly, but just can't see it because it has no background and the text isn't showing.

Try using a rounded rect button system button, just to see if that makes it show up. Set the text correctly. I'll also remove setting the font, just incase there's a problem with the font.

// backButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
backButton = [UIButton buttonWithType:UIButtonTypeSystem];
backButton.frame = CGRectMake(10, 25, 150, 75);
[backButton setTitle:@"Back" forState:UIControlStateNormal];
[self.view addSubview:backButton];

---

Update: UIButtonTypeRoundedRect has beed deprecated.

Solution 2

You have created button using static method buttonWithType ,Again you have allocated memory for that button.

UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
backButton.frame = CGRectMake(10, 25, 150, 75);
backButton.titleLabel.font = [UIFont fontWithName:@"Helvetica-Bold" size:15];
backButton.titleLabel.text = @"Back";
[self.view addSubview:backButton];

Solution 3

You are setting the button title incorrectly. Use:

- (void)setTitle:(NSString *)title forState:(UIControlState)state

Also as others have said you don't need to initialize your button three times. Remove the 2nd and 3rd lines.