我知道如何通过从界面构建器拖动添加一个IBAction到按钮中,但是我想通过编程方式添加操作来节省时间并避免不断地来回切换。解决方案可能非常简单,但当我搜索时似乎找不到任何答案。谢谢!
我知道如何通过从界面构建器拖动添加一个IBAction到按钮中,但是我想通过编程方式添加操作来节省时间并避免不断地来回切换。解决方案可能非常简单,但当我搜索时似乎找不到任何答案。谢谢!
Swift 4
myButton.addTarget(self,
action: #selector(myAction),
for: .touchUpInside)
Objective-C
[myButton addTarget:self
action:@selector(myAction)
forControlEvents:UIControlEventTouchUpInside];
--
在action:@selector(myAction)
中,你需要注意是否在myAction
后面加上冒号。
这里是reference。
迅速回答:
myButton.addTarget(self, action: "click:", for: .touchUpInside)
func click(sender: UIButton) {
print("click")
}
文档:https://developer.apple.com/documentation/uikit/uicontrol/1618259-addtarget
click
需要sender
参数,因此在选择器字符串中用:
替换它。 - EtanCGRect 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];
尝试这个:
首先在您的视图控制器的.h文件中编写以下内容:
UIButton *btn;
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];
- (IBAction)btnClicked:(id)sender
{
//Write a code you want to execute on buttons click event
}
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 }
对于Swift 3
首先创建一个按钮操作函数,然后将该函数添加到您的按钮目标中。
func buttonAction(sender: UIButton!) {
print("Button tapped")
}
button.addTarget(self, action: #selector(buttonAction),for: .touchUpInside)
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
}
UIButton
继承自 UIControl
。它具有添加/删除操作的所有方法:UIControl 类参考。请查看“准备和发送操作消息”一节,其中包括 – sendAction:to:forEvent:
和 – addTarget:action:forControlEvents:
。
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];
IOS 14 SDK:
您可以添加带有闭包回调的操作:
let button = UIButton(type: .system, primaryAction: UIAction(title: "Button Title", handler: { _ in
print("Button tapped!")
}))
let textField = UITextField()
textField.addAction(UIAction(title: "", handler: { action in
let textField = action.sender as! UITextField
print("Text is \(textField.text)")
}), for: .editingChanged)
{{链接1:源代码}}