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
在Swift 4.2中编写下面的示例代码,用于以编程方式添加按钮。
override func viewDidLoad() {
super.viewDidLoad()
let myButton = UIButton(frame: CGRect(x: 100, y: 100, width: 100, height: 50))
myButton.backgroundColor = .green
myButton.setTitle("Hello UIButton", for: .normal)
myButton.addTarget(self, action: #selector(myButtonAction), for: .touchUpInside)
self.view.addSubview(myButton)
}
@objc func myButtonAction(sender: UIButton!) {
print("My Button tapped")
}
其他回答
在Swift 2和iOS 9.2.1中
var button: UIButton = UIButton(type: UIButtonType.Custom) as UIButton
self.button.frame = CGRectMake(130, 70, 60, 20)
self.button.setTitle("custom button", forState: UIControlState.Normal)
self.button.addTarget(self, action:"buttonActionFuncName", forControlEvents: UIControlEvents.TouchUpInside)
self.button.setTitleColor(UIColor.blackColor(), forState: .Normal)
self.button.layer.borderColor = UIColor.blackColor().CGColor
self.button.titleLabel?.font = UIFont(name: "Helvetica-Bold", size: 13)
self.view.addSubview(self.button)
API没有改变——只有语法改变了。你可以创建一个UIButton并像这样添加它:
var button = UIButton(frame: CGRectMake(0, 0, 50, 50))
self.view.addSubview(button) // assuming you're in a view controller
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")
}
func viewDidLoad(){
saveActionButton = UIButton(frame: CGRect(x: self.view.frame.size.width - 60, y: 0, width: 50, height: 50))
self.saveActionButton.backgroundColor = UIColor(red: 76/255, green: 217/255, blue: 100/255, alpha: 0.7)
saveActionButton.addTarget(self, action: #selector(doneAction), for: .touchUpInside)
self.saveActionButton.setTitle("Done", for: .normal)
self.saveActionButton.layer.cornerRadius = self.saveActionButton.frame.size.width / 2
self.saveActionButton.layer.borderColor = UIColor.darkGray.cgColor
self.saveActionButton.layer.borderWidth = 1
self.saveActionButton.center.y = self.view.frame.size.height - 80
self.view.addSubview(saveActionButton)
}
func doneAction(){
print("Write your own logic")
}
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)
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