swift button的基本属性设置与不显示title只显示边框和背景色的原因

Posted 2023-05-11

参考技术A        loginBtn=UIButton.init(type: .custom)

        loginBtn?.setTitle("登录", for: .normal)

//下面这种写法就显示不出字,要用上面的方法才行

        loginBtn?.titleLabel?.text="登录"

        loginBtn?.titleLabel?.font = UIFont.systemFont(ofSize: 20)

        loginBtn?.titleLabel?.textColor = .white

        loginBtn?.layer.borderColor=  UIColor.white.cgColor

        loginBtn?.layer.borderWidth = 1

        loginBtn?.layer.masksToBounds = true

        loginBtn?.layer.cornerRadius = 4

SWIFT Button的基本用法

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
        // Override point for customization after application launch.
        self.window!.backgroundColor = UIColor.whiteColor()
        self.window!.rootViewController = RootViewController()
        self.window!.makeKeyAndVisible()
        return true
    }


}

import UIKit

class RootViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        //初始化button
        let btn = UIButton(type: UIButtonType.Custom)
        //尺寸
        btn.frame = CGRect(x: 100, y: 100, width: 100, height: 50)
        //背景颜色
        btn.backgroundColor = UIColor.redColor()
        //设置标题
        btn.setTitle("按钮", forState: UIControlState.Normal)
        //设置标题的颜色
        btn.setTitleColor(UIColor.greenColor(), forState: UIControlState.Normal)
        //添加点击事件
        btn.addTarget(self, action: "printSomeThing:", forControlEvents: UIControlEvents.TouchUpInside)
        //self.view加载子视图btn
        self.view.addSubview(btn)
    }
    //点击按钮执行的方法
    func printSomeThing(button:UIButton){
        print(button)
    }

}