1.Cocoapods导入ReactiveCocoa:
use_frameworks!
target 'RACDemo' do
pod 'ReactiveObjC', '~> 2.1.0' end
不懂得可以看这个链接: http://www.tuicool.com/articles/Qju6fme
2.输出文本内容操作:
//
// ViewController.m
// RACDemo
//
// Created by 思 彭 on 17/1/4.
// Copyright © 2017年 思 彭. All rights reserved.
// #import "ViewController.h"
#import <ReactiveObjC/ReactiveObjC.h> @interface ViewController ()
@property (weak, nonatomic) IBOutlet UILabel *userNameLabel;
@property (weak, nonatomic) IBOutlet UILabel *passwordLabel;
@property (weak, nonatomic) IBOutlet UITextField *userNameTF;
@property (weak, nonatomic) IBOutlet UITextField *passwordTF; @end @implementation ViewController - (void)viewDidLoad {
[super viewDidLoad]; // 1.每次改变文本框中的文字，block中的代码都会执行。没有target-action，没有delegate，只有signal和block
[self.userNameTF.rac_textSignal subscribeNext:^(NSString * _Nullable x) { NSLog(@"text = %@",x);
}]; // 2.只关心超过3个字符长度的用户名
[[self.userNameTF.rac_textSignal filter:^BOOL(NSString * _Nullable value) {
NSString *text = value;
return text.length > ;
}]
subscribeNext:^(NSString * _Nullable x) {
NSLog(@"---%@",x);
}]; // 3.上面步骤分解如下:
RACSignal *userNameSourceSignal = self.userNameTF.rac_textSignal;
RACSignal *filteredUsername = [userNameSourceSignal filter:^BOOL(id _Nullable value) { NSString *text = value;
return text.length > ;
}];
[filteredUsername subscribeNext:^(id _Nullable x) {
NSLog(@"---%@",x);
}];
} @end
3.输出文本长度操作:
// 1.输出文本长度 > 的长度:
// map操作之后的步骤收到的都是NSNumber实例。你可以使用map操作来把接收的数据转换成想要的类型，只要它是个对象。
[[[self.userNameTF.rac_textSignal map:^id _Nullable(NSString * _Nullable value) {
return @(value.length);
}] filter:^BOOL(id _Nullable value) {
return [value integerValue] > 3;
}] subscribeNext:^(id _Nullable x) {
NSLog(@"length = %@",x);
}];
4.创建一些信号，来表示用户名和密码输入框中的输入内容是否有效,设置背景颜色:
// 2.创建一些信号，来表示用户名和密码输入框中的输入内容是否有效
RACSignal *validUserNameSignal = [self.userNameTF.rac_textSignal map:^id _Nullable(NSString * _Nullable value) { return @([self isValidUsername:value]); // 输出是一个用NSNumber封装的布尔值
}]; RACSignal *validPasseordSifnal = [self.passwordTF.rac_textSignal map:^id _Nullable(NSString * _Nullable value) { return @([self isValidPassword:value]);
}]; // 3.转换这些信号，从而能为输入框设置不同的背景颜色
[[validUserNameSignal map:^id _Nullable(id _Nullable value) { return [value boolValue] ? [UIColor clearColor] : [UIColor yellowColor];
}] subscribeNext:^(id _Nullable x) {
self.passwordTF.backgroundColor = x;
}]; [[validPasseordSifnal map:^id _Nullable(id _Nullable value) { return [value boolValue] ? [UIColor clearColor] : [UIColor yellowColor];
}] subscribeNext:^(id _Nullable x) {
self.passwordTF.backgroundColor = x;
}]; // 4.宏来更好的完成上面的事情
RAC(self.passwordTF, backgroundColor) = [validPasseordSifnal map:^id _Nullable(id _Nullable value) { return [value boolValue] ? [UIColor clearColor] : [UIColor yellowColor];
}]; RAC(self.userNameTF, backgroundColor) = [validUserNameSignal map:^id _Nullable(id _Nullable value) {
return [value boolValue] ? [UIColor clearColor] : [UIColor yellowColor];
}];
} - (BOOL)isValidUsername:(NSString *)username {
return username.length > ;
} - (BOOL)isValidPassword:(NSString *)password {
return password.length > ;
}
5.登录按钮的点击进入判断条件:
// 5.聚合信号 登录按钮只有当用户名和密码输入框的输入都有效时才工作
RACSignal *signUpActiveSignal = [RACSignal combineLatest:@[validUserNameSignal ,validPasseordSifnal] reduce:^id (NSNumber *userNameValid, NSNumber *passwordValid) { return @([userNameValid boolValue] && [passwordValid boolValue]);
}];
[signUpActiveSignal subscribeNext:^(id _Nullable x) { self.logInButton.enabled = [x boolValue];
}];
6.登录按钮触发:
[[self.logInButton rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(__kindof UIControl * _Nullable x) {
NSLog(@"button Click---");
}];
[[[self.logInButton
rac_signalForControlEvents:UIControlEventTouchUpInside]
flattenMap:^id(id x){
return[self logginSignal];
}]
subscribeNext:^(NSNumber*signedIn){
BOOL success =[signedIn boolValue];
if(success){
NSLog(@"成功登录");
ViewController1 *vc1 = [[ViewController1 alloc]init];
[self.navigationController pushViewController:vc1 animated:YES];
}
}];
学了一些基础,慢慢学习吧!!! 需要源码的可以Q我哟!! 1299625033..哈哈
参考博文链接: http://www.cocoachina.com/ios/20150123/10994.html