how can i disable user touch of a UIbarbutton without disabling?

问题

i have a UiBarButton item in my Toolbar.i need to deactivate the user touch interaction in UiBarButton. there is no setUserInteractionEnabled property to it. when i am hiding it there is no proper visibility .can any one tell me that how can i disable user touch interaction of a UIbarbutton without disabling it?

回答1:

To have a title in a UIToolBar, add a UIBarButtonItem to your toolbar and then set its customView property to a UILabel. You can then set the text of the label and not have any highlighting, etc.

// In @interface section:
@property (weak, nonatomic) IBOutlet UIBarButtonItem *titleButtonItem;

// In @implementation section:
- (void)viewDidLoad {
  ...
  UILabel *titleLabel = [[UILabel alloc] init];
  self.titleButtonItem.customView = titleLabel;
  titleLabel.text = @"Some Title Text";
  [titleLabel sizeToFit];
  ...
}

回答2:

You can do this:

[barButtonItem setTarget:nil];
[barButtonItem setAction:nil];

The button looks enabled but it will not receive any touch event.

回答3:

You can always do:

[yourbutton removeTarget:nil 
                  action:NULL 
        forControlEvents:UIControlEventAllEvents];

That will remove all actions and targets associated with the button.

回答4:

Make a custom property associated with your button.

Let's say your button fires the action below:

-(IBAction)fireOnButtonPress:(id)sender {
    // do something
}

Make an instance variable such as BOOL interactionEnabled; and in your viewDidLoad or other init method set it to YES

interactionEnabled = YES;

When you need to disable button interaction, simply set it to NO

interactionEnabled = NO;

In your method that is fired when the button is pressed, just add an if-condition checking to see what the state of interactionEnabled is, like so:

-(IBAction)fireOnButtonPress:(id)sender {
    if(interactionEnabled) {
        // do something
    }
    // otherwise ignore button press
}

This won't disable the button, but it will prevent the user from interacting with it when you don't want them to.

回答5:

You alloc-init a custom UILabel as a UIBarbuttonItem (how? see this post) with no text and it should be large enough to cover the UIBarbuttonItem you want to disable. It worked for me.

回答6:

Obj - c

UIButton *barButton = [UIButton buttonWithType:UIButtonTypeCustom];
[barButton setImage:[UIImage imageNamed:@"image.png"] forState:UIControlStateNormal];
[barButton setImage:[UIImage imageNamed:@"image.png"] forState:UIControlStateDisabled];
barButton.frame = CGRectMake(10.0,10.0,50,50);
UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithCustomView:aButton];
backButton.enabled = NO;
self.navigationItem.leftBarButtonItem = backButton;

Swift 4

For Button Image

let barButton = UIButton(type: .custom)
    barButton.setImage(UIImage(named: "image.png"), for: .normal)
    barButton.setImage(UIImage(named: "image.png"), for: .disabled)
    barButton.frame = CGRect(x: 10.0, y: 10.0, width: 50, height: 50)
    let backButton = UIBarButtonItem(customView: aButton)
    backButton.isEnabled = false
    navigationItem.leftBarButtonItem = backButton

For Button Title

let btnTitle = UIBarButtonItem(title: "Your Button title", style: .plain, target: nil, action:nil)
    btnTitle.setTitleTextAttributes([NSAttributedStringKey.font: UIFont(name: "fontname", size: 14.0)!], for: .normal)
    btnTitle.setTitleTextAttributes([NSAttributedStringKey.font: UIFont(name: "fontname", size: 14.0)!], for: .disabled)
    btnTitle.isEnabled = false
    self.navigationItem.leftBarButtonItems = [btnTitle]

回答7:

You can find your answer here.

In .h File:

IBOutlet UIBarButtonItem *button1;

In .m File:

[button1 setEnabled:FALSE];

Create the UIBarButtonItem as IBOutlet in .h file and access in the implementation file and you can use the problerty of UIBarButtonItem - "setEnabled" to make it enable or disable.

Let me know if you need more help.

来源：https://stackoverflow.com/questions/6212827/how-can-i-disable-user-touch-of-a-uibarbutton-without-disabling

标签

iphone

objective-c

xcode

uibarbuttonitem