如何在 xcode 中以编程方式向按钮添加操作

Question

我知道如何通过从界面生成器中拖动来将 IBAction 添加到按钮，但我想以编程方式添加操作以节省时间并避免不断地来回切换。解决方案可能非常简单，但当我搜索时，我似乎找不到任何答案。谢谢你！

Answer 1

CGRect buttonFrame = CGRectMake( 10, 80, 100, 30 );
        UIButton *button = [[UIButton alloc] initWithFrame: buttonFrame];
        [button setTitle: @"My Button" forState: UIControlStateNormal];
        [button addTarget:self action:@selector(btnSelected:) forControlEvents:UIControlEventTouchUpInside];
        [button setTitleColor: [UIColor redColor] forState: UIControlStateNormal];
[view addSubview:button];

Answer 2

试试这个：

首先将其写入 viewcontroller 的 .h 文件中

UIButton *btn;

现在将其写入 viewcontrollers viewDidLoad 的 .m 文件中。

btn=[[UIButton alloc]initWithFrame:CGRectMake(50, 20, 30, 30)];
[btn setBackgroundColor:[UIColor orangeColor]];
//adding action programatically
[btn addTarget:self action:@selector(btnClicked:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];

在视图控制器的 .m 文件中编写这个外部 viewDidLoad 方法

- (IBAction)btnClicked:(id)sender
{
   //Write a code you want to execute on buttons click event
}

Answer 3

 CGRect buttonFrame = CGRectMake( x-pos, y-pos, width, height );   //
 CGRectMake(10,5,10,10) 

 UIButton *button = [[UIButton alloc] initWithFrame: buttonFrame];

 button setTitle: @"My Button" forState: UIControlStateNormal];

 [button addTarget:self action:@selector(btnClicked:) 
 forControlEvents:UIControlEventTouchUpInside];

 [button setTitleColor: [UIColor BlueVolor] forState:
 UIControlStateNormal];

 [view addSubview:button];




 -(void)btnClicked {
    // your code }

Answer 4

对于 Swift 3

首先为按钮操作创建一个函数，然后将该函数添加到您的按钮目标

func buttonAction(sender: UIButton!) {
    print("Button tapped")
}

button.addTarget(self, action: #selector(buttonAction),for: .touchUpInside)

Answer 5

UIButton *btnNotification=[UIButton buttonWithType:UIButtonTypeCustom];
btnNotification.frame=CGRectMake(130,80,120,40);
btnNotification.backgroundColor=[UIColor greenColor];
[btnNotification setTitle:@"create Notification" forState:UIControlStateNormal];
[btnNotification addTarget:self action:@selector(btnClicked) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btnNotification];


}

-(void)btnClicked
{
    // Here You can write functionality 

}

Answer 6

UIButton 继承自UIControl。它具有添加/删除操作的所有方法： UIControl 类参考。请参阅“准备和发送操作消息”部分，其中涵盖了 – sendAction:to:forEvent: 和 – addTarget:action:forControlEvents:。

Answer 7

 UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self 
       action:@selector(aMethod1:)
forControlEvents:UIControlEventTouchUpInside];
[button setTitle:@"Show View" forState:UIControlStateNormal];
button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
[view addSubview:button];   

Answer 8

iOS 14 SDK：
您可以添加带有关闭回调的操作：

let button = UIButton(type: .system, primaryAction: UIAction(title: "Button Title", handler: { _ in
            print("Button tapped!")
        }))

获取对控件发送者的引用

let textField = UITextField()
textField.addAction(UIAction(title: "", handler: { action in
    let textField = action.sender as! UITextField
    print("Text is \(textField.text)")
}), for: .editingChanged)

来源

Answer 9

试试这个：

Swift 4

myButton.addTarget(self,
                   action: #selector(myAction),
                   for: .touchUpInside)

Objective-C

[myButton addTarget:self 
             action:@selector(myAction) 
   forControlEvents:UIControlEventTouchUpInside];

您可以在 Apple 文档中找到丰富的信息源。看一下 UIButton 的文档，它会显示 UIButton 是 UIControl, 实现了 添加目标。

--

需要注意myAction后面是否加冒号
action:@selector(myAction)

这是参考。

Answer 10

快速回答：

myButton.addTarget(self, action: "click:", for: .touchUpInside)

func click(sender: UIButton) {
    print("click")
}

文档： https://developer.apple.com/documentation/uikit /uicontrol/1618259-addtarget