IOS初学

Swift iOS开发：iOS 14环境搭建与项目实战 #生活技巧# #工作学习技巧# #编程语言学习路径#

UIView视图的创建

func test3(){

let rect1=CGRect(x: 30, y: 50, width: 200, height: 200);

let view1=UIView(frame: rect1);

        view1.backgroundColor=UIColor.red;

let rect2=CGRect(x: 90, y: 120, width: 200, height: 200);

let view2=UIView(frame: rect2);

        view2.backgroundColor=UIColor.purple;

self.view.addSubview(view1);

self.view.addSubview(view2);

    }

展示效果为

对test3中代码的优化以及视图的层级关系

func test4(){

let view1=UIView(frame:CGRect(x: 20, y: 80, width: 300  , height: 300));

        view1.backgroundColor=UIColor.blue;

self.view.addSubview(view1);

let view2 = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200));

        view2.bounds=CGRect(x: -100, y: -100, width: 200, height: 200);

        view2.backgroundColor=UIColor.red;

self.view.addSubview(view2);

let view3 = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100));

        view3.backgroundColor=UIColor.black;

        view2.addSubview(view3);

    }

视图的基本操作添加删除以及切换视图在父视图中的层次

func test5(){

let view1=UIView(frame: CGRect(x: 30, y: 50, width: 200, height: 200));

        view1.backgroundColor=UIColor.red;

self.view.addSubview(view1);

let btAdd=UIButton(frame: CGRect(x: 30, y: 350, width: 80, height: 30));

        btAdd.backgroundColor=UIColor.gray;

        btAdd.setTitle("添加视图", for: UIControlState());

        btAdd.addTarget(self, action: #selector(ViewController.addView), for: UIControlEvents.touchUpInside);

self.view.addSubview(btAdd);

let btBack=UIButton(frame: CGRect(x: 130, y: 350, width: 80, height: 30));

        btBack.backgroundColor=UIColor.gray;

        btBack.setTitle("切换视图层级", for: UIControlState());

        btBack.addTarget(self, action: #selector(ViewController.bringViewBack), for: UIControlEvents.touchUpInside);

self.view.addSubview(btBack);

let btRemove=UIButton(frame: CGRect(x: 220, y: 350, width: 80, height: 30));

        btRemove.backgroundColor=UIColor.gray;

        btRemove.setTitle("删除视图", for: UIControlState());

        btRemove.addTarget(self, action: #selector(ViewController.removeview), for: UIControlEvents.touchUpInside);

self.view.addSubview(btRemove);

    }

@objc func addView(sender:UIButton!){

let view=UIView(frame: CGRect(x: 60, y: 30, width: 200, height: 200));

        view.backgroundColor=UIColor.purple;

        view.tag=1;

self.view.addSubview(view);

    }

@objc func bringViewBack(sender:UIButton!){

let view=self.view.viewWithTag(1);

self.view.sendSubview(toBack:view!);

    }

@objc func removeview(sender:UIButton!){

let view=self.view.viewWithTag(1);

        view?.removeFromSuperview();

    }

UIView视图的渐变填充  纹理填充

func test7() {

let view=UIView(frame: CGRect(x: 30, y: 60, width: 200, height: 200));

let gradientLayer=CAGradientLayer();

        gradientLayer.frame=view.frame;

let indexColor=UIColor.yellow.cgColor;

let midColor=UIColor.red.cgColor;

let endColor=UIColor.purple.cgColor;

        gradientLayer.colors=[indexColor,midColor,endColor];

        view.layer.addSublayer(gradientLayer);

self.view.addSubview(view);

let selfBackground=UIImage(named: "Sample");

let imageColor=UIColor.init(patternImage:selfBackground!);

self.view.backgroundColor=imageColor;

    }

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