ReactiveCocoa基础篇
2018-03-29 本文已影响16人
马克吐温Coder
ReactiveCocoa简介
- 使用了函数响应式编程思想
- 使用了HOOK思想
- 统一了代理，通知，Block，KVO，消息传递机制
- 提供了很多Category方法更方便的监听动态，传递消息
ReactiveCocoa几大消息类
1.RACSignal
/**<1.创建信号*/
RACSignal *signal = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber> _Nonnull subscriber) {
/**<3.发送信号*/
[subscriber sendNext:@"我跑了"];
/**<4.取消订阅信号*/
return [RACDisposable disposableWithBlock:^{
NSLog(@"我取消了订阅");
}];
}];
/**<2.订阅信号*/
[signal subscribeNext:^(id _Nullable x) {
NSLog(@"%@", x);
}];
2.RACSubject(RACSignal子类)
/**<1.创建信号*/
RACSubject *subject = [RACSubject subject];
/**<2.订阅信号*/
[subject subscribeNext:^(id _Nullable x) {
NSLog(@"%@", x);
}];
/**<3.发送信号*/
[subject sendNext:@"我也跑了"];
3.RACReplaySubject(RACSubject子类，可以先发送信号，在订阅信号)
/**<1.创建信号*/
RACReplaySubject *replaySubjct = [RACReplaySubject subject];
/**<2.发送信号*/
[replaySubjct sendNext:@"我起飞了"];
/**<3.订阅信号*/
[replaySubjct subscribeNext:^(id _Nullable x) {
NSLog(@"%@", x);
}];
4.RACCommand
/**<RACCommand可直接传递信号，多用于网络封装*/
/**<1.创建RACCommand*/
RACCommand * command = [[RACCommand alloc] initWithSignalBlock:^RACSignal * _Nonnull(id _Nullable input) {
return [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber> _Nonnull subscriber) {
/**<3.发送信号*/
[subscriber sendNext:@"我开始跑了"];
return nil;
}];
}];
/**<2.订阅RACCommand信号*/
[command.executionSignals subscribeNext:^(id _Nullable x) {
/**<4.返回的不是一个对象，而是一个信号*/
[x subscribeNext:^(id _Nullable x) {
NSLog(@"%@",x);
}];
}];
5.常用基础方法
-
RAC代替代理（一）
**第一个VC .m文件
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
TestSecondVC *testVC = [[TestSecondVC alloc] init];
//遵守代理
testVC.delegate = self;
[[self
rac_signalForSelector:@selector(sendMessageWith:)fromProtocol:@protocol(TestSecondVCDelegate)] subscribeNext:^(RACTuple * _Nullable x) {
//RACTuple元祖
NSLog(@"%@",x.first);
}];
[self.navigationController pushViewController:testVC animated:YES];
}
第二个VC .h文件
@protocol TestSecondVCDelegate
- (void)sendMessageWith:(NSString *)str;
@end
@interface TestSecondVC : UIViewController
@property (nonatomic, assign)id<TestSecondVCDelegate>delegate;
@end
第二个VC .m文件
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
[self.delegate sendMessageWith:@"我是代理"];
}
-
RAC代替代理（二）
第一个VC .m文件
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
TestSecondVC *testVC = [[TestSecondVC alloc] init];
[testVC.subject subscribeNext:^(id _Nullable x) {
NSLog(@"%@",x);
}];
[self.navigationController pushViewController:testVC animated:YES];
}
第二个VC .h文件
@interface TestSecondVC : UIViewController
@property (nonatomic, strong)RACSubject *subject;
@end
第二个VC .m文件
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
[self.subject sendNext:@"传送信息"];
}
- 对交互监听，数据绑定，通知，KVO
/**<监听键盘输入*/
UITextField *textfield = [[UITextField alloc] init];
@weakify(self);
[textfield.rac_textSignal subscribeNext:^(NSString * _Nullable x) {
@strongify(self);
self.name = x;
}];
/**<监听数据变更*/
[RACObserve(self, name) subscribeNext:^(id _Nullable x) {
NSLog(@"%@", x);
}];
/**<数据绑定*/
RAC(self,name) = textfield.rac_textSignal;
/**<监听点击事件*/
[[[[UIButton alloc] init] rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(__kindof UIControl * _Nullable x) {
}];
/**<KVO监听*/
[[self.view rac_valuesForKeyPath:@"backgroundColor" observer:self] subscribeNext:^(id _Nullable x) {
}];
/**<通知*/
[[[NSNotificationCenter defaultCenter] rac_addObserverForName:UIKeyboardDidShowNotification object:nil] subscribeNext:^(NSNotification * _Nullable x) {
}];
6.信号串并联
- 信号串联
/**<1.创建信号一*/
RACSignal *signalOne = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber> _Nonnull subscriber) {
/**<5.发送信号一*/
[subscriber sendNext:@"信号一"];
/**<6.信号一发送完成（必须写，代表信号一已经发送完成，否则无法触发信号二）*/
[subscriber sendCompleted];
return nil;
}];
/**<2.创建信号二*/
RACSignal *signalTwo = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber> _Nonnull subscriber) {
/**<7.发送信号二*/
[subscriber sendNext:@"信号二"];
/**<8.信号二发送完成*/
[subscriber sendCompleted];
return nil;
}];
/**<3.串联信号*/
RACSignal *concatSignal = [signalOne concat:signalTwo];
/**<4.订阅信号*/
[concatSignal subscribeNext:^(id _Nullable x) {
NSLog(@"%@", x);
}];
- 信号并联
/**<1.创建信号一*/
RACSignal *signalOne = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber> _Nonnull subscriber) {
/**<5.发送信号一*/
[subscriber sendNext:@"信号一"];
return nil;
}];
/**<2.创建信号二*/
RACSignal *signalTwo = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber> _Nonnull subscriber) {
/**<6.发送信号二*/
[subscriber sendNext:@"信号二"];
return nil;
}];
/**<3.并联信号*/
RACSignal *concatSignal = [signalOne merge:signalTwo];
/**<4.订阅信号*/
[concatSignal subscribeNext:^(id _Nullable x) {
NSLog(@"%@", x);
}];
7.信号改造
- map 对信号的数据进行改造
/**<1.创建信号*/
RACSignal *signal = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber> _Nonnull subscriber) {
[subscriber sendNext:@"4点了"];
return [RACDisposable disposableWithBlock:^{
}];
}];
/**<2.信号内容改造*/
signal = [signal map:^id _Nullable(id _Nullable value) {
if ([value isEqualToString:@"4点了"]) {
return @"放学了";
}
return @"没放学";
}];
/**<3.订阅信号*/
[signal subscribeNext:^(id _Nullable x) {
NSLog(@"放学没有?%@",x);
}];
- flattenMap 对信号进行改造
/**<1.创建信号*/
RACSignal *signal = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber> _Nonnull subscriber) {
[subscriber sendNext:@"发送信号1"];
return [RACDisposable disposableWithBlock:^{
}];
}];
/**<2.信号改造*/
[[signal flattenMap:^__kindof RACSignal * _Nullable(id _Nullable value) {
/**<也可以用这种方式返回信号*/
// return [RACReturnSignal return:[NSString stringWithFormat:@"输出:%@",value]];
return [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber> _Nonnull subscriber) {
[subscriber sendNext:@"发送信号2"];
return nil;
}];
}] subscribeNext:^(id _Nullable x) {
NSLog(@"%@", x);//打印：发送信号2
}];
