我尝试了一个React Native Navigator的例子：
# 1. Construct the sparse matrix with numbers_of_occurrences
D = [d[1] for d in mydata]
v = DictVectorizer(sparse=True)
kmeans_data = v.fit_transform(D)
# 2. Normalize by computing sums for each row and dividing
import numpy as np
sums = np.sum(kmeans_data,axis=1).A[:,0]
N = len(s)
divisor = csr_matrix((np.reciprocal(s),(range(N),range(N))))
kmeans_data = divisor*kmeans_data)
如何将参数传递给StudentStackNav并将其传递给StudentLogin？
我已尝试import UIKit
class ViewController: UIViewController {
var circle : Circle?;
override func viewDidLoad() {
super.viewDidLoad();
view.backgroundColor = UIColor.white;
setupViews();
}
func setupViews(){
circle = Circle(frame: self.view.frame);
view.addSubview(circle!);
circle?.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true;
circle?.topAnchor.constraint(equalTo: view.topAnchor).isActive = true;
circle?.heightAnchor.constraint(equalTo: view.heightAnchor).isActive = true;
circle?.widthAnchor.constraint(equalTo: view.widthAnchor).isActive = true;
}
}
class Circle : UIView{
override init(frame: CGRect) {
super.init(frame: frame);
self.backgroundColor = .blue;
self.translatesAutoresizingMaskIntoConstraints = false;
setupCircle();
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
let gradientLayer = CAGradientLayer();
func setupCircle(){
layer.addSublayer(shapeLayer);
let circlePath = UIBezierPath(arcCenter: CGPoint(x: self.frame.width / 2 - 50, y: self.frame.height / 2 - 50), radius: 50, startAngle: CGFloat(Double.pi * (0 / 4)), endAngle: CGFloat(Double.pi * 2), clockwise: true);
shapeLayer.path = circlePath.cgPath;
let group = CAAnimationGroup()
group.animations = [animateStrokeEnd, animateOpacity]
group.duration = 0.8
group.repeatCount = HUGE // repeat forver
shapeLayer.add(group, forKey: nil)
}
let shapeLayer: CAShapeLayer = {
let layer = CAShapeLayer();
layer.strokeColor = UIColor.white.cgColor;
layer.lineWidth = 5;
layer.fillColor = UIColor.clear.cgColor;
layer.strokeStart = 0
layer.strokeEnd = 1;
return layer;
}();
let animateOpacity : CABasicAnimation = {
let animation = CABasicAnimation(keyPath: "opacity");
animation.fromValue = 0;
animation.toValue = 0.8;
animation.byValue = 0.01;
animation.repeatCount = Float.infinity;
return animation
}();
let animateStrokeEnd: CABasicAnimation = {
let animation = CABasicAnimation(keyPath: "strokeEnd");
animation.fromValue = 0;
animation.repeatCount = Float.infinity;
animation.toValue = 1;
return animation;
}();
}
但const StudentStackNav = StackNavigator({
Home: {
screen: StudentLogin,
}
});
中未提供<StudentStackNav name='Lucy'>。
答案 0 :(得分：10)
导航器组件上的普通道具可用于配置导航器。
要向屏幕发送任意道具，您必须使用screenProps。
例如：
<StudentStackNav screenProps={{ name: 'Lucy' }}/>
StudentLogin中this.props.screenProps将提供哪些内容。
screenProps记录在this page