两个带有2个uibutton的选项卡

Question

I have the following buttons:

// First Tab selected
UIButton *firstTabButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
firstTabButton.frame = CGRectMake(75, 42, 153, 42);
[firstTabButton setTitle:@"FirstTab selected" forState:UIControlStateNormal];
[firstTabButton addTarget:self action:@selector(tabToggler:) forControlEvents:UIControlEventTouchUpInside];
[firstTabButton setBackgroundImage:[UIImage imageNamed:@"FirstTabActive.png"] forState:UIControlStateNormal];
firstTabButton.adjustsImageWhenHighlighted = NO;
[self.view addSubview:firstTabButton];

// First Tab

UIButton *firstTabButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
firstTabButton.frame = CGRectMake(75, 42, 153, 42);
[firstTabButton setTitle:@"FirstTab selected" forState:UIControlStateNormal];
[firstTabButton addTarget:self action:@selector(tabToggler:) forControlEvents:UIControlEventTouchUpInside];
[firstTabButton setBackgroundImage:[UIImage imageNamed:@"FirstTab.png"] forState:UIControlStateNormal];
firstTabButton.adjustsImageWhenHighlighted = NO;
[self.view addSubview:firstTabButton];

//Second Tab Active
UIButton *secondTabButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
secondTabButton.frame = CGRectMake(75, 42, 153, 42);
[secondTabButton setTitle:@"Second Tab Active" forState:UIControlStateNormal];
[secondTabButton addTarget:self action:@selector(tabToggler:) forControlEvents:UIControlEventTouchUpInside];
[secondTabButton setBackgroundImage:[UIImage imageNamed:@"SecondTabActive.png"] forState:UIControlStateNormal];
secondTabButton.adjustsImageWhenHighlighted = NO;
[self.view addSubview:secondTabButton];
appDelegate = [[UIApplication sharedApplication] delegate];

//Second Tab
UIButton *secondTabButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
secondTabButton.frame = CGRectMake(75, 42, 153, 42);
[secondTabButton setTitle:@"Second Tab" forState:UIControlStateNormal];
[secondTabButton addTarget:self action:@selector(tabToggler:) forControlEvents:UIControlEventTouchUpInside];
[secondTabButton setBackgroundImage:[UIImage imageNamed:@"SecondTabActive.png"] forState:UIControlStateNormal];
secondTabButton.adjustsImageWhenHighlighted = NO;
[self.view addSubview:secondTabButton];
appDelegate = [[UIApplication sharedApplication] delegate];

For the first time I'd like to display First tab Active and the 2nd tab.

What the tabToggler method will look like? How do I proceed?

Answer 1

You should just use 2 instances of UIButton and have them declared as properties/ivars in your .h file. Then just switch the properties that make a button look active/inactive in your toggleActiveTab method.

Like so:

In .h

@interface...
{
  UIButton *_firstButton;
  UIButton *_secondButton;
}

In .m (loadView or viewDidLoad, depending on whether you use a NIB or not):

_firstButton = <code to set up the first button>;
_secondButton = <code to set up the second button>;

Finally, your toggleActiveTab method might look something like this:

- (void)toggleActiveTab
{
  BOOL activateSecond = _firstButton.enabled;
  _firstButton.enabled = !activateSecond;
  _secondButton.enabled = activateSecond;

  // whatever other setup
}

Don't forget to release the 2 buttons in your dealloc method.

Also: Have you considered using a UITabBarController instead?