RXSwift的一些基本交互(OC,Swift,RXSwift对

以下主要是swift的一些基本交互，对比OC，Swift，RXSwift的写法，感受RX的牛逼之处。。。
所有的控件的UI创建和布局不做展示，自己敲0.0
刚刚接触swift，如有不对，各位请不吝赐教。
首先定义 let disposeBag = DisposeBag() 这是一个RXSwift的内存回收

1.基本的网络请求
OC中的写法：

  NSURLRequest*request = [NSURLRequestrequestWithURL:[NSURL URLWithString:"https://www.baidu.com"]];
        NSURLSession *session = [NSURLSession sharedSession];
        NSURLSessionTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
            NSDictionary *rootDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
            NSArray *array = [rootDic objectForKey:@"applications"];
            for(NSDictionary *dicinarray) {
            NSLog(@"%@",[dic objectForKey:@"name"]);
            }
        }];

Swift的写法：

 let url = URL(string: "https://www.baidu.com")
        URLSession.shared.dataTask(with: url!) { (data, response, error)in
            print(String.init(data: data!, encoding: .utf8)asAny)
        }.resume()

RXSwift中的写法：

  let url = URL(string: "https://www.baidu.com")
        URLSession.shared.rx.response(request: URLRequest(url: url!))
            .subscribe(onNext: { (response,data)in
                print(response)
            })
            .disposed(by:disposeBag)

2.timer定时器
OC中的写法：

NSTimer *timer  = [NSTimer scheduledTimerWithTimeInterval:60.0target:selfselector:@selector(timerAction) userInfo:nilrepeats:YES];
        [[NSRunLoop mainRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];

Swift的写法：

   Timer.scheduledTimer(timeInterval:5, target:self, selector:#selector(timeSelect), userInfo:nil, repeats:true)
        @objcfunctimeSelect() {
                print("----")
            }

RXSwift中的写法：
RX中的timer和OC不一样，rx中的timer是一种自己定义的状态，进行不断的改变达到类似于OC的timer的效果，所以rx的timer不受runloop的影响。

var timer:Observable!
timer = Observable<Int>.interval(5, scheduler: MainScheduler.instance)//放在主线程执行 MainScheduler.instance
        timer.subscribe(onNext: { (num)in
            print(num)
        })
        .disposed(by:disposeBag)

3.通知
OC中的写法：

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(changeScrollStatus：) name:@"leaveTop" object:nil];

- (void)changeScrollStatus：(NSNotification *)notification{
        NSDictionary *dic = notification.object;
    }
    -(void)dealloc{
         [[NSNotificationCenter defaultCenter] removeObserver:self name:@"leaveTop" object:nil];
    }

Swift的写法：

NotificationCenter.default.addObserver(self, selector: #selector(testNotifi), name: NSNotification.Name(rawValue: "testNotifi"), object: nil)

@objc func testNotifi(nofi:Notification){
        let str = nofi.userInfo!["post"]
        print(String(describing: str!) + " this notifi")
    }

RXSwift中的写法：

 NotificationCenter.default.rx.notification(UIResponder.keyboardWillShowNotification)
            .subscribe(onNext: { (noti) in
                print("接收到键盘弹出\(noti)")
            })
            .disposed(by: disposeBag)

4.手势
OC中的写法：

UITapGestureRecognizer *tapgesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapgestureClick:)];
        [self.view addGestureRecognizer:tapgesture];

Swift的写法：

 self.label.isUserInteractionEnabled = true
        let tap = UITapGestureRecognizer(target: self, action: #selector(self.titlelabelClick(tapGes:)))
        self.label.addGestureRecognizer(tap)


@objc func titlelabelClick(tapGes:UITapGestureRecognizer){
        if tapGes.state == .ended{
            print("label被点击了")
        }
        
    }

RXSwift中的写法：

let tap = UITapGestureRecognizer()
        self.label.addGestureRecognizer(tap)
        self.label.isUserInteractionEnabled = true
        tap.rx.event
            .subscribe(onNext: { (tap) in
                print("label被点击了")
            })
        .disposed(by: disposeBag)

5.scrollView的滑动事件响应
这个就写了一个RXSwift的写法，其他的费事没去实现：

scrollView.rx.contentOffset
        .subscribe(onNext: { [weak self](content) in
            self?.view.backgroundColor = UIColor.init(red: content.y/255*0.8, green: content.y/255*0.6, blue: content.y/255*0.3, alpha: 1)
        })
        .disposed(by: disposeBag)

6.textfiled的输入
OC中的写法：

textFiled.delegate  = self

//然后去实现代理

Swift的写法：

textFiled.delegate  = self

extension ViewController: UITextFieldDelegate{
    
    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        print("textfield----\(string)" )
        return true
    }
    
}

RXSwift中的写法：

 self.textFiled.rx.text.orEmpty
            .subscribe(onNext: { (text) in
                print(text)
            })
            .disposed(by: disposeBag)

7.button响应
OC中的写法：

//这个我不会~~~

Swift的写法：

self.button.addTarget(self, action: #selector(self.buttonClick(btnclick:)), for: .touchUpInside)

@objc func buttonClick(btnclick:UIButton){
         print("bbuttonb被点击了~~~~")
    }
    

RXSwift中的写法：

self.button.rx.tap
            .subscribe(onNext: { () in
                print("bbuttonb被点击了~~~~")
            })
            .disposed(by: disposeBag)

8.KVO

这里首先需要创建一个Person类，定义一个监听的属性name，下面直接给出swift的Person创建

import UIKit

class LGPerson: NSObject {
   //@objc  用OC调用这段代码    dynamic（动态的）--> 启用OC 的runtime
   @objc dynamic var name:String = "小庄"
}

OC中的写法：

[self.person addObserver:self forKeyPath:@"name" options:NSKeyValueObservingOptionNew context:nil];

    -(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context{
        NSLog(@"%@",change[NSKeyValueChangeNewKey]);
    }
    -(void)dealloc{
        [self.person removeObserver:self forKeyPath:"name"];
    }

Swift的写法：

self.person.addObserver(self, forKeyPath: "name", options: .new, context: nil)

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        print(change?[.newKey] as? String ?? "完了，没拿到值")
    }

RXSwift中的写法：

  self.person.rx.observeWeakly(String.self, "name")
            .subscribe(onNext: { (value) in
                print("rx KVO == \(value!)")
            })
        .disposed(by: disposeBag)

最后给出一个点击空白处的touch事件响应方法

  override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        print("touch")
        NotificationCenter.default.post(name: NSNotification.Name("testNotifi"), object: self, userInfo: ["post":"通知接收的消息到了"])
        self.view.endEditing(false)
        self.person.name += "+呵呵哒";
    }