I have been studying PHP for more than a year now, and I have accumulated a lot of notes, which are quite complicated. Let me write an article to sort them out.
Learning any language starts from hello world, hahaha
Start my swift learning journey
//这个好像就是类似于OC的懒加载 (个人观点--菜鸡观点) fileprivate var helloBtn: UIButton = { let helloBtn = UIButton(type:.custom) //初始化UIButton helloBtn.frame = CGRect(x: 100, y: 100, width: 205, height: 50) //设置frame helloBtn.backgroundColor = UIColor.blue //设置背景颜色 helloBtn.setTitle("欢迎", for: UIControlState.normal) //设置title (普通状态下) helloBtn.setTitleColor(UIColor.white, for: .normal) //设置title的颜色 (普通状态下) helloBtn.setTitle("hello world", for: UIControlState.selected) //设置title (点击状态下) helloBtn.addTarget(self, action: #selector(helloBtnClick), for: .touchUpInside) //添加点击事件 return helloBtn }()
As for what effect we need to achieve, let’s wait for the code Finished
After initializing a button OK, you need to load it on the View and display it
//这个方法相当于 OC里的 -(void)viewDidLoad; override func viewDidLoad() { super.viewDidLoad() //在view上添加一个按钮 self.view .addSubview(helloBtn) }
ok, but there is still a click event method
extension ViewController{ //这个就是点击事件出发的方法 @objc fileprivate func helloBtnClick(sender :UIButton){ //改变状态 sender.isSelected = !sender.isSelected; } }
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