Why my UIButton doesn't display in my subview? iPad App - ios

Question

Could somebody help me to understand why my UIButton doesn't display in my custom UIView?
In the code below I posted initWithFrame method:
- (id)initWithFrame:(CGRect)frame{
self = [super initWithFrame:frame];
if (self) {
self.backgroundColor =[UIColor whiteColor];
UIToolbar *toolbar = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0,frame.size.width, 50)];
toolbar.backgroundColor = [UIColor grayColor];
UIBarButtonItem *cancelBarButton = [[UIBarButtonItem alloc]initWithTitle:#"Cancel" style:UIBarButtonItemStylePlain target:self action:#selector(dismissNewInvoiceView:)];
UIBarButtonItem *flexibleSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
UIBarButtonItem *saveBarButton = [[UIBarButtonItem alloc] initWithTitle:#"Save" style:UIBarButtonItemStylePlain target:self action:#selector(saveNewInvoice:)];
[saveBarButton setEnabled:NO];
NSArray *arrayOfItems = [[NSArray alloc]initWithObjects:cancelBarButton,flexibleSpace, saveBarButton, nil];
[toolbar setItems:arrayOfItems];
UILabel *headerViewLabel = [[UILabel alloc]initWithFrame:CGRectMake(335, 15, 200, 20)];
headerViewLabel.text = #"New Invoice";
[toolbar addSubview:headerViewLabel];
[self addSubview:toolbar];
UIButton *selectCustomerButton = [[UIButton alloc]initWithFrame:CGRectMake(25, 200, 60, 60)];
selectCustomerButton.imageView.image = [UIImage imageNamed:#"Farmer.png"];
[self addSubview:selectCustomerButton];
[self bringSubviewToFront:selectCustomerButton];
UILabel *invoiceNumberLabel = [[UILabel alloc]initWithFrame:CGRectMake(25, 55, 150, 25)];
[invoiceNumberLabel setFont:[UIFont fontWithName:#"Verdana" size:14]];
invoiceNumberLabel.text = #"Invoice number:";
[self addSubview:invoiceNumberLabel];
UITextField *invoiceNumberField = [[UITextField alloc]initWithFrame:CGRectMake(140, 53, 150, 30)];
[invoiceNumberField setFont:[UIFont fontWithName:#"Verdana" size:25]];
invoiceNumberField.placeholder = #"25/13";
[self addSubview:invoiceNumberField];
UILabel *dateOfCreationLabel = [[UILabel alloc]initWithFrame:CGRectMake(500, 55, 150, 25)];
[dateOfCreationLabel setFont:[UIFont fontWithName:#"Verdana" size:14]];
dateOfCreationLabel.text = #"Date of creation:";
[self addSubview:dateOfCreationLabel];
}
return self;}
Why UILabels are displaying properly by implement addSubview method while UIButtons are not?
Regards

Answer 1

Don't do this:
selectCustomerButton.imageView.image = [UIImage imageNamed:#"Farmer.png"]
Use
[selectCustomerButton setImage:[UIImage imageNamed:#"Farmer.png"] forState:UIControlStateNormal];
The button sets its own image views image depending on its state, you don't access and set the image view's image yourself.

Answer 2

The button will be just invisible in case the image is not loaded/shown properly. As jrturton already said, you should use another method to set the image.
To figure out if the button is 'there', you can give the button a backgroundcolor like this:
selectCustomerButton.backgroundColor = [UIColor redColor];
If you see a red box, you know the image is not properly loaded or maybe not even found.