UIStoryboard
//1.通过stroyboard获取控制器
let childVc = UIStoryboard(name: "Home", bundle: nil).instantiateInitialViewController()!
顶部导航栏UIBarButtonItem
controller继承UIViewController,子类有navigationItem(UINavigationItem)
let btn = UIButton()
btn.setImage(UIImage(named: "logo"), for: UIControl.State.normal)//logo是图片资源名
//swift的图片资源不用写路径名,要求图片资源唯一
顶部导航栏左边按钮:navigationItem.leftBarButtonItem = UIBarButtonItem(customView: btn)
顶部导航栏右边按钮数组navigationItem.rightBarButtonItems = []
UITapGestureRecognizer:
假如你想要在你的应用中检测手势，例如点击，缩放，平移，或者旋转，用Swift和内建的UIGestureRecognizer类实现是非常容易的
let tapGes = UITapGestureRecognizer(target: self, action: #selector(self.titleLabelClick(tagGes:)))
label.addGestureRecognizer(tapGes)
//获取手势所在view
@objc private func titleLabelClick(tagGes: UITapGestureRecognizer){
guard let currentLabel = tagGes.view as? UILabel else {return}
}
//获取位置
func picTap(sender: UITapGestureRecognizer) {
let point = sender.location(in: sender.view)
}
alert对话框
注意,最后要present才会弹出对话框,然后是一个alertController里面加alertAction,可以有多个alertAction
let alertController = UIAlertController(title:"提示", message:"学生账号注册暂未开放z", preferredStyle: .alert)
let alertOK = UIAlertAction(title: "好的", style: .cancel, handler:nil)
alertController.addAction(alertOK)
present(alertController, animated:true, completion: nil)
UITextField
UITextField加placeholder:
textField.attributedPlaceholder = NSAttributedString.init(string:"请输入用户名", attributes: [
NSAttributedString.Key.foregroundColor:UIColor.lightGray])
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