如何在运行时为UIBarButtonItem设置目标和操作

Question

试过这个但只适用于UIButton:

[btn setTarget:self action:@selector(btnClicked:) forControlEvents:UIControlEventTouchUpInside];

Answer 1

只需直接设置UIBarButtonItem target和action属性即可.

Answer 2

UIBarButtonItem没有相同的addTarget方法,因此您必须按如下方式直接设置它们

btn.target = self;
btn.action = @selector(barButtonCustomPressed:);

...

// can specify UIBarButtonItem instead of id for this case
-(IBAction)barButtonCustomPressed:(UIBarButtonItem*)btn 
{
    NSLog(@"button tapped %@", btn.title);
}

Answer 3

我遇到了类似的问题...我认为你的意思是如果你的UIButton不是你的UITabBar的一部分来调用btnClicked然后它适当地工作.如果这是您提出的问题,请检查您的btnClicked方法并将其更改为:

-btnClicked:(id)sender

至

-(void) btnClicked:(id)sender

那,并在头文件中声明btnClicked ...

对于它的价值,这就是我在tabbarbuttonitem中设置按钮的方式:

UIBarButtonItem *exampleButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"button.png"] style:UIBarButtonItemStylePlain target:self action:@selector(btnClicked:)];

Answer 4

设置target和action你的UIBarButtonItem

斯威夫特4

button.target = self
button.action = #selector(action)

@objc func action (sender:UIButton) {
    print("action")
}

Answer 5

如果你需要在你的代码中有足够的时间,那么继续前进并扩展UIBarButtonItem我在Swift下面所做的事情是很好的.:)

import UIKit

extension UIBarButtonItem {
    func addTargetForAction(target: AnyObject, action: Selector) {
        self.target = target
        self.action = action
    }
}

例如,将self作为a UIViewController,您只需调用:

self.myBarButtonItem.addTargetForAction(self, action: #selector(buttonPressed(_:))

Answer 6

  UIBarButtonItem *barListBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemAdd target:self action:@selector(getTruckStopListAction)];   
    self.navigationItem.rightBarButtonItem = barListBtn;
    [barListBtn release];