ReactiveCocoa學(xué)習(xí)筆記

.ReactiveCocoa地址

swift
oc

  • RACSiganl
    RACSiganl是信號(hào)類(lèi),表示將要有數(shù)據(jù)傳遞观谦，只要有數(shù)據(jù)改變，信號(hào)內(nèi)部接收到數(shù)據(jù)熄诡，就會(huì)發(fā)出數(shù)據(jù)临燃。
// 1.創(chuàng)建信號(hào)
RACSignal *signal = [RACSignal createSignal:^RACDisposable * _Nullable(id  _Nonnull subscriber) {
        // 2.發(fā)送信號(hào)
        NSLog(@"RACSignal");
        [subscribersendNext:@"data"];
        [subscribersendCompleted];
       return [RACDisposable disposableWithBlock:^{
            // 信號(hào)執(zhí)行完成
            NSLog(@"RACDisposable");
        }];
    }];

    // 3.訂閱信號(hào)，只有訂閱信號(hào)蒜田，信號(hào)才會(huì)被激活默認(rèn)為冷信號(hào)
    [signalsubscribeNext:^(id  _Nullablex) {
        NSLog(@"x=%@",x);
    }error:^(NSError*_Nullableerror) {
        NSLog(@"error");
    }completed:^{
        NSLog(@"completed");
    }];
  • RACSubject和RACReplaySubject
    RACReplaySubject是RACSubject的子類(lèi)稿械。
    RACReplaySubject可以先發(fā)送信號(hào)在訂閱信號(hào)；RACSubject必須先訂閱在發(fā)送信號(hào)
// 必須先訂閱在發(fā)送信號(hào)
    // 創(chuàng)建信號(hào)
    RACSubject *subject = [RACSubject subject];
    // 訂閱
    [subject subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];
    [subject subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];
  // 發(fā)送信號(hào)
    [subject sendNext:@"data"];

RACReplaySubject *subject = [RACReplaySubject subject];
    [subject sendNext:@"123"];
    [subject subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];
    
    [subject subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];
  • RACSubject界面值傳遞（代理）
    TestView.h
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
#import "ReactiveObjC.h"

NS_ASSUME_NONNULL_BEGIN

@interface TestView : UIView

@property (nonatomic, strong) RACSubject *subject;

@end

NS_ASSUME_NONNULL_END

TestView.m

#import "TestView.h"

@implementation TestView

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    
    [self.subject sendNext:@"123"];
}
@end

Controller代碼

   TestView *view = [[TestView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
    view.backgroundColor = UIColor.blueColor;
    [self.view addSubview:view];
    
    RACSubject *subject = [RACSubject subject];
    view.subject = subject;
    [subject subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];
  • RACSequence用于代替NSArray,NSDictionary,可以使用它來(lái)快速遍歷數(shù)組和字典冲粤，字典轉(zhuǎn)模型美莫。
//遍歷數(shù)組
    NSArray *ary = @[@"11",@"22",@"33"];
    [ary.rac_sequence.signal subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];
    
    //遍歷字典
    NSDictionary *dic = @{@"a":@"11",@"b":@"22",@"c":@"33"};
    [dic.rac_sequence.signal subscribeNext:^(id  _Nullable x) {
        RACTupleUnpack(NSString *key, NSString *value) = x;
        NSLog(@"%@=%@",key,value);
    }];
    
    //字典轉(zhuǎn)模型
    NSArray *dicArray = @[@{@"name":@"zhangsan",@"describe":@"zhangsanxxxx"},
                          @{@"name":@"lisi",@"describe":@"lisixxxx"},
                          @{@"name":@"wangwu",@"describe":@"wangwuxxxx"}];
    
   NSArray *arrayM = [[dicArray.rac_sequence map:^id _Nullable(id  _Nullable value) {
        return [TestModel initDic:value];
    }] array];
    NSLog(@"%@",arrayM);

TestModel

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface TestModel : NSObject

@property (nonatomic, strong) NSString *name;
@property (nonatomic, strong) NSString *describe;
+(instancetype)initDic:(NSDictionary *)dic;

@end

NS_ASSUME_NONNULL_END


#import "TestModel.h"

@implementation TestModel
+(instancetype)initDic:(NSDictionary *)dic{
    TestModel *m = [[TestModel alloc] init];
    [m setValuesForKeysWithDictionary:dic];
    return m;
}
@end
  • RACMulticastConnection
    RACMulticastConnection:解決RACSignal副作用
   RACSignal *signal = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
        
        NSLog(@"信號(hào)被訂閱");
        
        [subscriber sendNext:@"data"];
        
        return nil;
    }];
    
    [signal subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];

    [signal subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];

代碼執(zhí)行結(jié)果：信號(hào)被訂閱打印兩次
EA37D6EF-CDE8-4F51-A318-913D04A04BB4.png

改進(jìn)

RACSignal *signal = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
        
        NSLog(@"信號(hào)被訂閱");
        
        [subscriber sendNext:@"data"];
        
        return nil;
    }];
    
//    [signal subscribeNext:^(id  _Nullable x) {
//        NSLog(@"%@",x);
//    }];
//
//    [signal subscribeNext:^(id  _Nullable x) {
//        NSLog(@"%@",x);
//    }];
    
    RACMulticastConnection *connection = [signal publish];
    [connection.signal subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];

    [connection.signal subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];

    [connection connect];

執(zhí)行結(jié)果


400FC857-529E-4418-8602-E415B266DF05.png
  • RACCommand
    用于處理事件的類(lèi),可用于監(jiān)聽(tīng)按鈕點(diǎn)擊、網(wǎng)絡(luò)請(qǐng)求
// 創(chuàng)建RACCommand
   RACCommand *command = [[RACCommand alloc] initWithSignalBlock:^RACSignal * _Nonnull(id  _Nullable input) {
        NSLog(@"RACCommand,%@",input);
       // 創(chuàng)建信號(hào)
        return [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
            [subscriber sendNext:@"data"];
            [subscriber sendCompleted];
            return nil;
        }];
    }];
    
    //訂閱RACCommand中的信號(hào)
//    [command.executionSignals subscribeNext:^(id  _Nullable x) {
//
//        NSLog(@"%@",x);
//        [x subscribeNext:^(id  _Nullable x) {
//            NSLog(@"%@",x);
//        }];
//    }];
    //訂閱RACCommand中的信號(hào)(第二種寫(xiě)法)
    [command.executionSignals.switchToLatest subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];

    // 監(jiān)聽(tīng)命令是否執(zhí)行完畢,skip表示跳過(guò)第一次信號(hào)
    [[command.executing skip:1] subscribeNext:^(NSNumber * _Nullable x) {
        if ([x boolValue]) {
            NSLog(@"正在執(zhí)行");
        }else{
            NSLog(@"執(zhí)行完成");
        }
    }];
    
    // 執(zhí)行RACCommand
    [command execute:@"11"];
  • 代替KVO
    rac_valuesForKeyPath 
@interface ViewController ()
@property (nonatomic, assign) int count;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    //KVO
    [[self rac_valuesForKeyPath:@keypath(self, count) observer:self] subscribeNext:^(id  _Nullable x) {
      NSLog(@"%@",x);
    }];
}

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    self.count++;
}

RACObserve可以監(jiān)聽(tīng)屬性改變

[RACObserve(self, count) subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
 }];

rac_signalForControlEvents監(jiān)聽(tīng)按鈕點(diǎn)擊事件

 UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
    [btn setTitle:@"點(diǎn)擊" forState:(UIControlStateNormal)];
    btn.backgroundColor = [UIColor blueColor];
    [self.view addSubview:btn];
    [[btn rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(__kindof UIControl * _Nullable x) {
        NSLog(@"%@",x);
    }];

rac_addObserverForName代替通知

//監(jiān)聽(tīng)通知
[[[NSNotificationCenter defaultCenter] rac_addObserverForName:@"changeName" object:nil] subscribeNext:^(NSNotification * _Nullable x) {
        NSLog(@"%@",x);
    }];
   //發(fā)送通知
    [[NSNotificationCenter defaultCenter] postNotificationName:@"changeName" object:nil userInfo:@{@"name":@"zhangsan"}];

rac_textSignal 監(jiān)聽(tīng)文本改變

UITextField *field = [[UITextField alloc] initWithFrame:CGRectMake(100, 100, 200, 44)];
    field.backgroundColor = [UIColor yellowColor];
    [self.view addSubview:field];
    
    [field.rac_textSignal subscribeNext:^(NSString * _Nullable x) {
        NSLog(@"%@",x);
    }];

rac_liftSelector:withSignalsFromArray:Signals 多個(gè)信號(hào)發(fā)送完成后統(tǒng)一調(diào)用

-(void)demo13{
    RACSignal *signal = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
        [subscriber sendNext:@"signal1"];
        [subscriber sendCompleted];
        return nil;
    }];
    
    RACSignal *signal2 = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
        [subscriber sendNext:@"signal2"];
        [subscriber sendCompleted];
        return nil;
    }];
    
    [self rac_liftSelector:@selector(endMethods:str2:) withSignalsFromArray:@[signal,signal2]];
}
-(void)endMethods:(NSString *)str1 str2:(NSString *)str2{
    
    NSLog(@"str1 =%@",str1);
    NSLog(@"str2 =%@",str2);
}

flattenMap梯捕，Map簡(jiǎn)單使用

UITextField *field = [[UITextField alloc] initWithFrame:CGRectMake(100, 100, 200, 44)];
    field.backgroundColor = [UIColor yellowColor];
    [self.view addSubview:field];
    
    [[field.rac_textSignal flattenMap:^__kindof RACSignal * _Nullable(NSString * _Nullable value) {
        return [RACReturnSignal return:[NSString stringWithFormat:@"修改文本框輸入的值：%@",value]];
    }] subscribeNext:^(id  _Nullable x) {
        NSLog(@"==%@",x);
    }];
    
    [[field.rac_textSignal map:^id _Nullable(NSString * _Nullable value) {
        return [NSString stringWithFormat:@"修改文本框輸入的值：%@",value];
    }] subscribeNext:^(id  _Nullable x) {
        NSLog(@"==%@",x);
    }];

concat按指定順序

    RACSubject *s1 = [RACReplaySubject subject];
    RACSubject *s2 = [RACReplaySubject subject];
    RACSubject *s3 = [RACReplaySubject subject];
    
    [s1 sendNext:@"s1"];
    [s1 sendCompleted];
    [s2 sendNext:@"s2"];
    [s2 sendCompleted];
    [s3 sendNext:@"s3"];
    [s3 sendCompleted];
    
    [[[s2 concat:s3] concat:s1] subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];

then:忽略信號(hào)

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    [[[self signal1] then:^RACSignal * _Nonnull{
        return [self signal2];
    }] subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];
}

-(RACSignal *)signal1{
    RACSubject *signal = [RACReplaySubject subject];
    [self loadData1:^(id data) {
        //loadDtat2需要loadDtat1的參數(shù)可以在此做記錄
        [signal sendNext:data];
        [signal sendCompleted];
    }];
    return signal;
}
-(RACSignal *)signal2{
    RACSubject *signal = [RACReplaySubject subject];
    [self loadDtat2:^(id data) {
        [signal sendNext:data];
        [signal sendCompleted];
    }];
    return signal;
}
-(void)loadData1:(void(^)(id))success{
    success(@"第一個(gè)請(qǐng)求數(shù)據(jù)");
}
-(void)loadDtat2:(void(^)(id))success{
    success(@"第二個(gè)請(qǐng)求數(shù)據(jù)");
}

merge:合并信號(hào)厢呵，只要任何一個(gè)信號(hào)發(fā)送數(shù)據(jù),就能訂閱

    RACSubject *s1 = [RACReplaySubject subject];
    RACSubject *s2 = [RACReplaySubject subject];
    RACSubject *s3 = [RACReplaySubject subject];
    
    [s2 sendNext:@"s2"];
    [s1 sendNext:@"s1"];
    [s3 sendNext:@"s3"];
    
    [[[s3 merge:s1] merge:s2] subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];

zipWith: 壓縮信號(hào)數(shù)據(jù)成元組，同時(shí)發(fā)送數(shù)據(jù)

 RACSubject *s1 = [RACReplaySubject subject];
    RACSubject *s3 = [RACReplaySubject subject];
    
    [s1 sendNext:@"s1"];
    [s3 sendNext:@"s3"];
    
    [[s3 zipWith:s1] subscribeNext:^(id  _Nullable x) {
        RACTupleUnpack(NSString *str1, NSString *str2) = x;
        NSLog(@"%@ %@",str1,str2);
        
    }];

combineLatestWith信號(hào)合并

UITextField *name = [[UITextField alloc] initWithFrame:CGRectMake(100, 100, 200, 44)];
    name.backgroundColor = [UIColor yellowColor];
    [self.view addSubview:name];
    
    UITextField *pwd = [[UITextField alloc] initWithFrame:CGRectMake(100, 150, 200, 44)];
    pwd.backgroundColor = [UIColor yellowColor];
    [self.view addSubview:pwd];
    
    UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(100, 200, 100, 100)];
    [btn setTitle:@"點(diǎn)擊" forState:(UIControlStateNormal)];
    btn.backgroundColor = [UIColor blueColor];
    [self.view addSubview:btn];
    [[btn rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(__kindof UIControl * _Nullable x) {
        NSLog(@"%@",x);
    }];
    
    [[name.rac_textSignal combineLatestWith:pwd.rac_textSignal] subscribeNext:^(RACTwoTuple<NSString *,id> * _Nullable x) {
        RACTupleUnpack(NSString *name, NSString *pwd) = x;
        btn.enabled = name.length > 0 && pwd.length > 0;
    }];

combineLatest信號(hào)合并

UITextField *name = [[UITextField alloc] initWithFrame:CGRectMake(100, 100, 200, 44)];
    name.backgroundColor = [UIColor yellowColor];
    [self.view addSubview:name];
    
    UITextField *pwd = [[UITextField alloc] initWithFrame:CGRectMake(100, 150, 200, 44)];
    pwd.backgroundColor = [UIColor yellowColor];
    [self.view addSubview:pwd];
    
    UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(100, 200, 100, 100)];
    [btn setTitle:@"點(diǎn)擊" forState:(UIControlStateNormal)];
    btn.backgroundColor = [UIColor blueColor];
    [self.view addSubview:btn];
    [[btn rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(__kindof UIControl * _Nullable x) {
        NSLog(@"%@",x);
    }];
    
    [[RACSignal combineLatest:@[name.rac_textSignal,pwd.rac_textSignal] reduce:^id(NSString *name ,NSString *pwd){
        return @(name.length > 0 && pwd.length > 0);
    }] subscribeNext:^(id  _Nullable x) {
        btn.enabled = [x boolValue];
    }];

精簡(jiǎn)寫(xiě)法

RAC(btn,enabled) = [RACSignal combineLatest:@[name.rac_textSignal,pwd.rac_textSignal] reduce:^id(NSString *account,NSString *pwd){
        return @(account.length > 0 && pwd.length > 0);
    }];

filter過(guò)濾

 UITextField *name = [[UITextField alloc] initWithFrame:CGRectMake(100, 100, 200, 44)];
    name.backgroundColor = [UIColor yellowColor];
    [self.view addSubview:name];
    
    [[name.rac_textSignal filter:^BOOL(NSString * _Nullable value) {
        return value.length > 6 && value.length < 10;
    }] subscribeNext:^(NSString * _Nullable x) {
        NSLog(@"%@",x);
    }];

最后附上demo地址

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