我如何以编程方式创建图形元素(如UIButton)在Swift?我试图创建和添加按钮到一个视图,但不能。
当前回答
你可以这样创建,也可以这样添加动作....
import UIKit
let myButton = UIButton(frame: CGRect(x: 0, y: 0, width: 50, height: 50))
init(nibName nibNameOrNil: String!, bundle nibBundleOrNil: NSBundle!)
{ super.init(nibName: nibName, bundle: nibBundle)
myButton.targetForAction("tappedButton:", withSender: self)
}
func tappedButton(sender: UIButton!)
{
println("tapped button")
}
其他回答
将此代码添加到viewDidLoad中 / /添加按钮
var button=UIButton(frame: CGRectMake(150, 240, 75, 30))
button.setTitle("Next", forState: UIControlState.Normal)
button.addTarget(self, action: "buttonTapAction:", forControlEvents: UIControlEvents.TouchUpInside)
button.backgroundColor = UIColor.greenColor()
self.view.addSubview(button)
将这个函数写在它的外面,当你点击按钮时,这个函数将被调用
func buttonTapAction(sender:UIButton!)
{
println("Button is working")
}
Swift:以编程方式创建Ui按钮
let myButton = UIButton()
myButton.titleLabel!.frame = CGRectMake(15, 54, 300, 500)
myButton.titleLabel!.text = "Button Label"
myButton.titleLabel!.textColor = UIColor.redColor()
myButton.titleLabel!.textAlignment = .Center
self.view.addSubview(myButton)
是的,在模拟器里。有时它不会识别选择器,这似乎是一个错误。即使我面对的不是你的代码,然后我只是改变了动作名称(选择器)。它的工作原理
let buttonPuzzle:UIButton = UIButton(frame: CGRectMake(100, 400, 100, 50))
buttonPuzzle.backgroundColor = UIColor.greenColor()
buttonPuzzle.setTitle("Puzzle", forState: UIControlState.Normal)
buttonPuzzle.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)
buttonPuzzle.tag = 22;
self.view.addSubview(buttonPuzzle)
选择器函数在这里:
func buttonAction(sender:UIButton!)
{
var btnsendtag:UIButton = sender
if btnsendtag.tag == 22 {
//println("Button tapped tag 22")
}
}
斯威夫特3
let btn = UIButton(type: .custom) as UIButton
btn.backgroundColor = .blue
btn.setTitle("Button", for: .normal)
btn.frame = CGRect(x: 100, y: 100, width: 200, height: 100)
btn.addTarget(self, action: #selector(clickMe), for: .touchUpInside)
self.view.addSubview(btn)
func clickMe(sender:UIButton!) {
print("Button Clicked")
}
输出
let myFirstButton = UIButton()
myFirstButton.setTitle("Software Button", forState: .Normal)
myFirstButton.setTitleColor(UIColor.redColor(), forState: .Normal)
myFirstButton.frame = CGRectMake(100, 300, 150, 50)
myFirstButton.backgroundColor = UIColor.purpleColor()
myFirstButton.layer.cornerRadius = 14
myFirstButton.addTarget(self, action: "pressed:", forControlEvents: .TouchUpInside)
self.view.addSubview(myFirstButton)
myFirstButton.hidden=true
nameText.delegate = self
func pressed(sender: UIButton!) {
var alertView = UIAlertView()
alertView.addButtonWithTitle("Ok")
alertView.title = "title"
alertView.message = "message"
alertView.show();
}
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