ios - UIBarButton上的点击事件怎么做

Question

由于UIBarButton不是继承自UIResponder/UIControl，点击事件如何UIBarButton工作？

Answer 1

只需直接创建 UIBarButtonItem 的target和action属性。

UIBarButtonItem *barListBtn = [[UIBarButtonItem alloc] initWithTitle:@"yourTitle" 
                             style:UIBarButtonItemStylePlain 
                            target:self action:@selector(btnClicked:)];   
self.navigationItem.rightBarButtonItem = barListBtn;



-(void)btnClicked:(UIBarButtonItem*)btn 
{
NSLog(@"button tapped %@", btn.title);
}

选择-2

- (void) viewDidLoad
{
[super viewDidLoad];

// first we create a button and set it's properties
UIBarButtonItem *myButton = [[UIBarButtonItem alloc]init];
myButton.action = @selector(doTheThing);
myButton.title = @"Hello";
myButton.target = self;

// then we add the button to the navigation bar
self.navigationItem.rightBarButtonItem = myButton;


}


// method called via selector
- (void) doTheThing {

NSLog(@"Doing the thing");

}

一些额外的样本

Answer 2

UIBarItem是添加到出现在屏幕底部的条的项目的抽象超类。条上的项目的行为类似于按钮（的实例UIButton）。它们有标题、图像、动作和目标。您还可以启用和禁用栏上的项目。

有关更多详细信息，请查看下面提到的链接： https ://developer.apple.com/library/ios/documentation/UIKit/Reference/UIBarItem_Class/index.html#//apple_ref/occ/cl/UIBarItem

斯威夫特： 添加以下行viewDidLoad

self.navigationItem.setRightBarButtonItem(UIBarButtonItem(barButtonSystemItem: .Search, target: self, action: "barButtonItemClicked:"), animated: true)

功能：

 func barButtonItemClicked()
    {
       print("Bar button clicked") 
    }