我知道如何通过从界面构建器拖动来向按钮添加IBAction,但我想以编程方式添加动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,但我在搜索时似乎无法找到任何答案。谢谢!
答案 0 :(得分:220)
试试这个:
Swift 4
myButton.addTarget(self,
action: #selector(myAction),
for: .touchUpInside)
<强>目标C 强>
[myButton addTarget:self
action:@selector(myAction)
forControlEvents:UIControlEventTouchUpInside];
您可以在Apple的文档中找到丰富的信息来源。看一下UIButton's documentation,它将揭示UIButton是UIControl,的后代,它实现了add targets的方法。
-
你需要注意在myAction
之后是否添加冒号
action:@selector(myAction)
这是reference。
答案 1 :(得分:23)
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
答案 2 :(得分:14)
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];
答案 3 :(得分:8)
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 }
答案 4 :(得分:8)
试试这个:
首先在viewcontroller的.h文件中写这个
UIButton *btn;
现在将它写在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];
将此视图外部的viewDidLoad方法写入视图控制器的.m文件中
- (IBAction)btnClicked:(id)sender
{
//Write a code you want to execute on buttons click event
}
答案 5 :(得分:6)
适用于Swift 3
首先为按钮操作创建一个函数,然后将该函数添加到按钮目标
func buttonAction(sender: UIButton!) {
print("Button tapped")
}
button.addTarget(self, action: #selector(buttonAction),for: .touchUpInside)
答案 6 :(得分:3)
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
}
答案 7 :(得分:2)
UIButton
继承自UIControl
。这包含添加/删除操作的所有方法:UIControl Class Reference。请查看“准备和发送操作消息”部分,其中包含– sendAction:to:forEvent:
和– addTarget:action:forControlEvents:
。
答案 8 :(得分:1)
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];
答案 9 :(得分:0)
IOS 14 SDK: 您可以使用闭包回调添加操作:
let button = UIButton(type: .system, primaryAction: UIAction(title: "Button Title", handler: { _ in
print("Button tapped!")
}))
获取对控制发送者的引用
let textField = UITextField()
textField.addAction(UIAction(title: "", handler: { action in
let textField = action.sender as! UITextField
print("Text is \(textField.text)")
}), for: .editingChanged)