1.ReactiveCocoa简介
ReactiveCocoa（简称为RAC）,是由Github开源的一个应用于iOS和OS开发的新框架,Cocoa是苹果整套框架的简称，因此很多苹果框架喜欢以Cocoa结尾。
2.ReactiveCocoa作用
在我们iOS开发过程中，当某些事件响应的时候，需要处理某些业务逻辑,这些事件都用不同的方式来处理。
比如按钮的点击使用action，ScrollView滚动使用delegate，属性值改变使用KVO等系统提供的方式。
其实这些事件，都可以通过RAC处理
ReactiveCocoa为事件提供了很多处理方法，而且利用RAC处理事件很方便，可以把要处理的事情，和监听的事情的代码放在一起，这样非常方便我们管理，就不需要跳到对应的方法里。非常符合我们开发中高聚合，低耦合的思想
在RAC中最核心的类RACSiganl
RACSubscriber:表示订阅者的意思，用于发送信号，这是一个协议，不是一个类，只要遵守这个协议，并且实现方法才能成为订阅者。通过create创建的信号，都有一个订阅者，帮助他发送数据
//RACSignal信号使用步骤：1：创建信号 2:订阅信号 3: 发送信号
//1：创建信号
RACSignal *signal = [RACSignal createSignal:^RACDisposable *(id subscriber) {
//didSubscribe调用:只有被订阅了，才调用
//didSubscribe作用:发送数据
//3:发送信号
[subscriber sendNext:@1];
return nil;
}];
//2:订阅信号
[signal subscribeNext:^(id x) {
//nextBlock调用：只有发送数据了才会调用
//nextBlock作用：接受数据，展示UI
NSLog(@"%@",x);
}];
```
```RACDisposable```: 用于取消订阅或者清理资源，当信号发送完成或者发送错误的时候，就会自动触发它。
--不想监听某个信号时，可以通过它主动取消订阅信号。
```objc
-(void)racWithSignalDisposable{
//1:创建信号
RACSignal *signal = [RACSignal createSignal:^RACDisposable *(id subscriber) {
_subscriber = subscriber;
//3发送信号
[subscriber sendNext:@1];
return [RACDisposable disposableWithBlock:^{
NSLog(@"取消订阅");
}];
}];
//2:订阅信号
RACDisposable *disposable = [signal subscribeNext:^(id x) {
NSLog(@"%@",x);
}];
//主要订阅者在就不会取消订阅者
[disposable dispose];
}
```
```RACSubject:RACSubject:``` 信号提供者，自己可以充当信号，又能发送信号。
使用场景:通常用来代替代理，有了它，就不必要定义代理了。
```objc
-(RACSubject *)subject{
if (_subject == nil) {
_subject = [RACSubject subject];
}
return _subject;
}
-(IBAction)clickBtn:(UIButton *)btn{
[self.subject sendNext:@1];
}
-(void)racWithDelegate{
//订阅
[_redView.subject subscribeNext:^(id x) {
NSLog(@"控制器做了一件事情%@",x);
}];
}
```
```RACTuple```: 元组类,类似NSArray,用来包装值.
```objc
-(void)racWtihTuple{
//rac集合
RACTuple *tuple = [RACTuple tupleWithObjectsFromArray:@[@"123",@"234",@1]];
//取出rac集合中的第0个元素
NSString *str = tuple[0];
NSLog(@"%@",str);
}
```
```RACSequence``` :RAC中的集合类，用于代替NSArray,NSDictionary,可以使用它来快速遍历数组和字典。
```objc
-(void)racWithAarray{
//rac遍历数组
//创建一个数组
NSArray *arry = @[@"123",@"321",@"111"];
//把数组转变为一个集合
RACSequence *sequence = arry.rac_sequence;
//把集合转换为一个信号
RACSignal *singnal = sequence.signal;
//使用信号订阅信息
[singnal subscribeNext:^(id x) {
NSLog(@"%@",x);
}];
[arry.rac_sequence.signal subscribeNext:^(id x) {
NSLog(@"%@",x);
}];
}
```
实例：
```objc
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
self.person.userName = [NSString stringWithFormat:@"zhangsan---%u",arc4random_uniform(100)];
}
//rac实现kvo
-(void)racWithKvo{
[RACObserve(self.person, userName) subscribeNext:^(id x) {
self.nameLabel.text = x;
}];
}
[_accountTextFiled.rac_textSignal subscribeNext:^(id x) {
self.nameLabel.text = x;
}];
```
#多个输入文件作为信号源
多用于登陆等业务需求
```objc
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px 'PingFang SC'; color: #4cbf57}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #ffffff}p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #ffffff; min-height: 13.0px}p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #93c86a}p.p5 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #4cbf57}span.s1 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures}span.s2 {font-variant-ligatures: no-common-ligatures}span.s3 {font-variant-ligatures: no-common-ligatures; color: #c2349b}span.s4 {font-variant-ligatures: no-common-ligatures; color: #ffffff}span.s5 {font-variant-ligatures: no-common-ligatures; color: #00afca}span.s6 {font-variant-ligatures: no-common-ligatures; color: #8b84cf}span.s7 {font: 11.0px 'PingFang SC'; font-variant-ligatures: no-common-ligatures}span.s8 {font-variant-ligatures: no-common-ligatures; color: #93c86a}span.s9 {font-variant-ligatures: no-common-ligatures; color: #e44448}
//多个文本框输入信号组合使用
-(void)racTextFiledsDemo{
RACSignal *nameSignal = [self.nameTextFiled rac_textSignal];
RACSignal *pwdSignal = [self.pwdTextFiled rac_textSignal];
NSArray *signals = @[nameSignal,pwdSignal];
//订阅信号
[[RACSignal combineLatest:signals]subscribeNext:^(RACTuple *x) {
NSString *name = x.first;
NSString *pawd = x.second;
NSLog(@"%@%@",x,name);
if (name.length>0 && pawd.length>0) {
self.photoImageView.image = [UIImage imageNamed:@"Demo"];
}else if(name.length >0 || pawd.length > 0){
self.photoImageView.image = [UIImage imageNamed:@"Demo1"];
}
}];
}
```
#rac_signalForSelector的使用，代替代理（不需要传值的情况下）
```objc
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #4cbf57}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #93c86a}p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #ffffff; min-height: 13.0px}p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #ffffff}span.s1 {font-variant-ligatures: no-common-ligatures; color: #ffffff}span.s2 {font-variant-ligatures: no-common-ligatures}span.s3 {font: 11.0px 'PingFang SC'; font-variant-ligatures: no-common-ligatures}span.s4 {font-variant-ligatures: no-common-ligatures; color: #c2349b}span.s5 {font-variant-ligatures: no-common-ligatures; color: #00afca}span.s6 {font-variant-ligatures: no-common-ligatures; color: #e44448}span.s7 {font-variant-ligatures: no-common-ligatures; color: #93c86a}
//rac_signalForSelector:监听某对象有没有调用某方法
[[self.readView rac_signalForSelector:@selector(clickBtn:)] subscribeNext:^(id x) {
NSLog(@"clickBtn");
}];
[[self rac_signalForSelector:@selector(didReceiveMemoryWarning)] subscribeNext:^(id x) {
NSLog(@"clickBtn");
}];
```
```objc
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #ffffff}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #ffffff; min-height: 13.0px}span.s1 {font-variant-ligatures: no-common-ligatures}span.s2 {font-variant-ligatures: no-common-ligatures; color: #c2349b}
@weakify(self)
[RACObserve(self.person, name) subscribeNext:^(id x) {
@strongify(self)
```
#全部代码
```objc
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #ffffff}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #ffffff; min-height: 13.0px}p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #e44448}p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #4cbf57}p.p5 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #93c86a}p.p6 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px 'PingFang SC'; color: #4cbf57}p.p7 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #00afca}span.s1 {font-variant-ligatures: no-common-ligatures}span.s2 {font-variant-ligatures: no-common-ligatures; color: #c2349b}span.s3 {font-variant-ligatures: no-common-ligatures; color: #ffffff}span.s4 {font-variant-ligatures: no-common-ligatures; color: #00afca}span.s5 {font: 11.0px 'PingFang SC'; font-variant-ligatures: no-common-ligatures}span.s6 {font-variant-ligatures: no-common-ligatures; color: #e44448}span.s7 {font-variant-ligatures: no-common-ligatures; color: #93c86a}span.s8 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures}span.s9 {font-variant-ligatures: no-common-ligatures; color: #8b84cf}span.s10 {font: 11.0px 'PingFang SC'; font-variant-ligatures: no-common-ligatures; color: #e44448}span.s11 {font-variant-ligatures: no-common-ligatures; color: #d28f5a}span.s12 {font-variant-ligatures: no-common-ligatures; color: #4cbf57}span.s13 {font: 11.0px 'PingFang SC'; font-variant-ligatures: no-common-ligatures; color: #4cbf57}
}
-(void)dealloc{
NSLog(@"viewController dealloc");
}
//rac代替代理
-(void)racWithDelegate{
// 1:rac的subject 2:rac的select
//rac_signalForSelector:监听某对象有没有调用某方法
[[self.readView rac_signalForSelector:@selector(clickBtn:)] subscribeNext:^(id x) {
NSLog(@"clickBtn");
}];
[[self rac_signalForSelector:@selector(didReceiveMemoryWarning)] subscribeNext:^(id x) {
NSLog(@"clickBtn");
}];
}
//多个文本框输入信号组合使用
-(void)racTextFiledsDemo{
RACSignal *nameSignal = [self.nameTextFiled rac_textSignal];
RACSignal *pwdSignal = [self.pwdTextFiled rac_textSignal];
NSArray *signals = @[nameSignal,pwdSignal];
//订阅信号
[[RACSignal combineLatest:signals]subscribeNext:^(RACTuple *x) {
NSString *name = x.first;
NSString *pawd = x.second;
NSLog(@"%@%@",x,name);
if (name.length>0 && pawd.length>0) {
self.photoImageView.image = [UIImage imageNamed:@"Demo"];
}else if(name.length >0 || pawd.length > 0){
self.photoImageView.image = [UIImage imageNamed:@"Demo1"];
}
}];
}
//rac及时刷新UI
-(void)racWithUI{
[_nameTextFiled.rac_textSignal subscribeNext:^(id x) {
self.nameLabel.text = x;
}];
}
//rRAC中的集合类,用于代替NSArray,NSDictionary,可以使用它来快速遍历数组和字典。
-(void)racWithSeq{
NSArray *array = @[@"7",@"3",@"4",@"5"];
// //把数组转为一个集合
// RACSequence *sequence = array.rac_sequence;
//
// //把集合转为一个信号
// RACSignal *signal = sequence.signal;
//
// //使用订阅者订阅信号
// [signal subscribeNext:^(id x) {
//
// NSLog(@"%@",x);
// }];
[array.rac_sequence.signal subscribeNext:^(id x) {
NSLog(@"%@",x);
}];
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
self.person.name = [NSString stringWithFormat:@"liuYAHUA－－－%u",arc4random_uniform(100)];
}
//rac中的kvo
-(void)racWithKvo{
@weakify(self)
//观察person的name属性
[RACObserve(self.person, name) subscribeNext:^(id x) {
@strongify(self)
self.nameLabel.text = x;
}];
}
//rac中订阅者的取消
-(void)racWithSignalDisposable{
//rac中最核心的就是信号 1:创建信号 2:订阅信号 3:发送信号
//1:创建信号
RACSignal *signal = [RACSignal createSignal:^RACDisposable *(id subscriber) {
//didSubscribe调用：只有被订阅了，才会调用
//didSubscribe作用：发送数据
_subscriber = subscriber;
//3:发送信号
[subscriber sendNext:@"刘亚华"];
return [RACDisposable disposableWithBlock:^{
NSLog(@"刘亚华被取消了");
}];
}];
//2:订阅信号
RACDisposable *disposable = [signal subscribeNext:^(id x) {
//nextBlock调用：只有发送了数据才会调用
//nextBlock作用：接受数据，展示UI
NSLog(@"%@",x);
}];
//取消
[disposable dispose];
}
-(void)racWithSignal{
//rac中最核心的就是信号 1:创建信号 2:订阅信号 3:发送信号
//1:创建信号
RACSignal *signal = [RACSignal createSignal:^RACDisposable *(id subscriber) {
//didSubscribe调用：只有被订阅了，才会调用
//didSubscribe作用：发送数据
//3:发送信号
[subscriber sendNext:@"刘亚华"];
return nil;
}];
//2:订阅信号
[signal subscribeNext:^(id x) {
//nextBlock调用：只有发送了数据才会调用
//nextBlock作用：接受数据，展示UI
NSLog(@"%@",x);
}];
}
```
＃链式编程
```objc
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #ffffff}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #ffffff; min-height: 13.0px}span.s1 {font-variant-ligatures: no-common-ligatures}span.s2 {font-variant-ligatures: no-common-ligatures; color: #c2349b}span.s3 {font-variant-ligatures: no-common-ligatures; color: #00afca}span.s4 {font-variant-ligatures: no-common-ligatures; color: #e44448}span.s5 {font-variant-ligatures: no-common-ligatures; color: #93c86a}
-(void)run{
NSLog(@"run");
}
-(void)play{
NSLog(@"play");
}
-(Person *(^)(CGFloat))run1{
return ^(CGFloat DIS){
NSLog(@"run1%f",DIS);
return self;
};
}
-(Person *(^)(NSString *))play1{
return ^(NSString *qiu){
NSLog(@"play1%@",qiu);
return self;
};
}
```