iOS: Adding icon in the button and a center text title

In my end, I did this using UIEdgeInsetsMake which the left corner is calculated to make it to the center. I am not sure if there's something really you can make the text at aligned at the center but this works for me. Make sure that you set your left corner to your desired position by calculating the width. e.g.UIEdgeInsetsMake(0.0f, 42.0f, 0.0f, 0.0f)

UIButton *scanBarCodeButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

scanBarCodeButton.frame = CGRectMake(center, 10.0f, fieldWidth, 40.0f);

[scanBarCodeButton setImage:[UIImage imageNamed:@"BarCodeIcon.png"] forState:UIControlStateNormal];

[scanBarCodeButton setTitle:@"Scan the Barcode" forState:UIControlStateNormal];

scanBarCodeButton.titleEdgeInsets = UIEdgeInsetsMake(0.0f, 42.0f, 0.0f, 0.0f);

[scanBarCodeButton setContentHorizontalAlignment:UIControlContentHorizontalAlignmentLeft];

[scanBarCodeButton addTarget:self action:@selector(scanBarCode:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:scanBarCodeButton];

The result, looks like this,

Hope this helps.