推荐比较好的一篇文章：https://www.jianshu.com/p/87ef6720a096
1、导入
如果项目是纯 OC 项目，你需要使用的是 ReactiveObjC
use_frameworks!
target 'Target名称' do
pod 'ReactiveObjC'
end
2、使用
a、代替Delegate
RedView.h
@interface RedView : UIView
@end
RedView.m
#import "RedView.h"
@interface RedView()
@property(nonatomic ,strong) UIButton *redBtn;
@end
@implementation RedView
- (instancetype)init
{
if (self = [super init]) {
_redBtn = [UIButton buttonWithType:UIButtonTypeCustom];
_redBtn.backgroundColor = [UIColor orangeColor];
[self addSubview:_redBtn];
[_redBtn addTarget:self action:@selector(redBtnClick:) forControlEvents:UIControlEventTouchUpInside];
}
return self;
}
- (void)layoutSubviews
{
[super layoutSubviews];
self.redBtn.frame = self.bounds;
}
- (void)redBtnClick:(UIButton *)btn
{
NSLog(@"%s 点击了RedView的RedBtn", __FUNCTION__);
}
@end
ViewController.m
#pragma mark - RAC代替Delegate
- (void)racReplaceDelegate
{
_redView = [[RedView alloc]init];
_redView.frame = CGRectMake(100, 100, 100, 100);
_redView.center = self.view.center;
_redView.backgroundColor = [UIColor redColor];
[self.view addSubview:_redView];
// RAC:判断下一个方法有没有调用,如果调用了就会自动发送一个信号给你
// 监听_redView有没有调用redBtnClick:,如果调用了就会转换成信号
[[_redView rac_signalForSelector:@selector(redBtnClick:)] subscribeNext:^(id _Nullable x) {
NSLog(@"%s 知道了红色View的RedBtnClick,可以做事情了", __FUNCTION__);
NSLog(@"%s x = %@", __FUNCTION__, x);
}];
}
b、代替KVO
@property(nonatomic ,assign) int num;
#pragma mark - RAC代替KVO
- (void)racReplaceKVO
{
// 监听哪个对象的属性改变
// 方法调用者:就是被监听的对象
// KeyPath:监听的属性
// 把监听到内容转换成信号
[[self rac_valuesForKeyPath:@"num" observer:self] subscribeNext:^(id _Nullable x) {
// block:只要属性改变就会调用,并且把改变的值传递给你
NSLog(@"%s x = %@", __FUNCTION__, x);
}];
}
/// 改变num
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
self.num++;
}
c、 监听事件
#pragma mark - RAC监听事件
- (void)racObserveEvent
{
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
btn.frame = CGRectMake(100, 100, 100, 100);
btn.center = self.view.center;
btn.backgroundColor = [UIColor purpleColor];
[self.view addSubview:btn];
UIButton *btn2 = [UIButton buttonWithType:UIButtonTypeCustom];
btn2.frame = CGRectMake(100, 100, 100, 100);
btn2.backgroundColor = [UIColor orangeColor];
[self.view addSubview:btn2];
[[btn rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(__kindof UIControl * _Nullable x) {
NSLog(@"%s RAC监听到了btn---UIControlEventTouchUpInside事件", __FUNCTION__);
NSLog(@"%s x = %@", __FUNCTION__, x);
}];
[[btn2 rac_signalForControlEvents:UIControlEventTouchDown] subscribeNext:^(__kindof UIControl * _Nullable x) {
NSLog(@"%s RAC监听到了btn2---UIControlEventTouchDown事件", __FUNCTION__);
NSLog(@"%s x = %@", __FUNCTION__, x);
}];
}
d、监听文本框文字改变
@property(nonatomic ,strong) UITextField *textField;
@property(nonatomic ,strong) UITextView *textView;
#pragma mark - 监听文本框文字改变
- (void)racObserveTextField
{
_textField = [[UITextField alloc]init];
_textField.frame = CGRectMake(50, 200, 300, 50);
_textField.backgroundColor = [UIColor lightGrayColor];
[self.view addSubview:_textField];
[[_textField rac_textSignal] subscribeNext:^(NSString * _Nullable x) {
NSLog(@"%s 监听到textField文字改变", __FUNCTION__); //相当于发出了 UITextFieldTextDidChangeNotification
NSLog(@"%s x = %@", __FUNCTION__, x);
}];
}
- (void)racObserveTextView
{
_textView = [[UITextView alloc]init];
_textView.frame = CGRectMake(50, 200, 300, 50);
_textView.backgroundColor = [UIColor lightGrayColor];
[self.view addSubview:_textView];
[[_textView rac_textSignal] subscribeNext:^(NSString * _Nullable x) {
NSLog(@"%s 监听到textView文字改变", __FUNCTION__); //相当于发出了 UITextViewTextDidChangeNotification
NSLog(@"%s x = %@", __FUNCTION__, x);
}];
}
e、代替通知
#pragma mark - RAC代替通知
- (void)racReplaceNotification
{
[[[NSNotificationCenter defaultCenter] rac_addObserverForName:UITextViewTextDidChangeNotification object:nil] subscribeNext:^(NSNotification * _Nullable x) {
NSLog(@"%s 接收到通知，x = %@", __FUNCTION__, x);
}];
}
f、处理多个请求，都返回结果，统一做处理
- (void)testRACSignal
{
// 创建信号A
RACSignal *signalA = [RACSignal createSignal:^RACDisposable * _Nullable(id _Nonnull subscriber) {
// 处理信号
NSLog(@"%s 创建信号A", __FUNCTION__);
// 发送数据
[subscriber sendNext:@"热门商品"];
return nil;
}];
// 创建信号B
RACSignal *signalB = [RACSignal createSignal:^RACDisposable * _Nullable(id _Nonnull subscriber) {
// 处理信号
NSLog(@"%s 创建信号", __FUNCTION__);
// 发送数据
[subscriber sendNext:@"最新商品"];
return nil;
}];
// RAC:就可以判断两个信号有没有都发出内容
// SignalsFromArray:监听哪些信号的发出
// 当signals数组中的所有信号都发送sendNext就会触发方法调用者(self)的selector
// 注意:selector方法的参数不能乱写,有几个信号就对应几个参数
// 不需要主动订阅signalA,signalB,方法内部会自动订阅
[self rac_liftSelector:@selector(updateUIWithHot: new:) withSignalsFromArray:@[signalA,signalB]];
}
- (void)updateUIWithHot:(NSString *)hot new:(NSString *)new
{
NSLog(@"%s hot = %@ , new = %@", __FUNCTION__, hot ,new);
}
Demo链接：https://github.com/iMaBiao/RACDemo.git