1. 创建信号
//1:创建信号
RACSignal *signal = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber> _Nonnull subscriber) {
//3:发送信号
[subscriber sendNext:@"wp"];
//请求网络 失败 error
NSError *error = [NSError errorWithDomain:NSURLErrorDomain code:10086 userInfo:@{@"key":@"10086错误"}];
[subscriber sendError:error];
//RACDisposable 销毁
return [RACDisposable disposableWithBlock:^{
NSLog(@"销毁了");
}];
}];
//2:订阅信号
[signal subscribeNext:^(id _Nullable x) {
NSLog(@"subscribeNext %@",x);
}];
//订阅错误信号
[signal subscribeError:^(NSError * _Nullable error) {
NSLog(@"subscribeError %@",error);
}];
打印如下:
subscribeNext wp
销毁了
subscribeError Error Domain=NSURLErrorDomain Code=10086 "(null)" UserInfo={key=10086错误}
销毁了
2. 替代KVO
监听name的变化
[RACObserve(self, name) subscribeNext:^(id _Nullable x) {
NSLog(@"%@",x);
}];
3. 替代代理
设置代理,然后进行监听
[[self rac_signalForSelector:@selector(textFieldDidBeginEditing:) fromProtocol:@protocol(UITextFieldDelegate)] subscribeNext:^(RACTuple * _Nullable x) {
NSLog(@"textFieldDidBeginEditing %@",x);
}];
self.textField.delegate = self;
4. 替代通知
[[[NSNotificationCenter defaultCenter] rac_addObserverForName:UIKeyboardWillShowNotification object:nil] subscribeNext:^(NSNotification * _Nullable x) {
NSLog(@"%@",x);
}];
5. 替代UI逻辑
//button 点击
[[self.button rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(__kindof UIControl * _Nullable x) {
NSLog(@"%@",x);
}];
//textField 文字监听
[self.textField.rac_textSignal subscribeNext:^(NSString * _Nullable x) {
NSLog(@"%@",x);
}];
//手势监听
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] init];
self.label.userInteractionEnabled = YES;
[self.label addGestureRecognizer:tap];
[tap.rac_gestureSignal subscribeNext:^(__kindof UIGestureRecognizer * _Nullable x) {
NSLog(@"%@",x);
}];
6. 替代数据遍历
//数组
NSArray *array = @[@"Cooci",@"123",@"18"];
[array.rac_sequence.signal subscribeNext:^(id _Nullable x) {
NSLog(@"%@",x);
}];
NSDictionary *dict = @{@"key":@"Cooci",@"age":@"18",@"gender":@"1"};
[dict.rac_sequence.signal subscribeNext:^(id _Nullable x) {
//类似swift中的元祖
NSLog(@"%@",x);
RACTwoTuple *tuple = (RACTwoTuple *)x;
NSLog(@"key == %@ , value = %@",tuple[0],tuple[1]);
}];
2019-01-31 10:54:33.728300+0800 001---RAC初探[2254:133490] wp
2019-01-31 10:54:33.728657+0800 001---RAC初探[2254:133490] 123
2019-01-31 10:54:33.728871+0800 001---RAC初探[2254:133490] 18
2019-01-31 10:54:33.729287+0800 001---RAC初探[2254:133489] <RACTwoTuple: 0x600002004390> (
key,
wp
)
2019-01-31 10:54:33.729404+0800 001---RAC初探[2254:133489] key == key , value = wp
2019-01-31 10:54:33.729639+0800 001---RAC初探[2254:133489] <RACTwoTuple: 0x6000020109a0> (
age,
18
)
2019-01-31 10:54:33.729744+0800 001---RAC初探[2254:133489] key == age , value = 18
2019-01-31 10:54:33.729933+0800 001---RAC初探[2254:133489] <RACTwoTuple: 0x6000020109e0> (
gender,
1
)
2019-01-31 10:54:33.730042+0800 001---RAC初探[2254:133489] key == gender , value = 1
7. 替代Timer
NSLog(@"执行前 %@",[NSThread currentThread]);
[[RACSignal interval:1 onScheduler:[RACScheduler schedulerWithPriority:(RACSchedulerPriorityHigh) name:@"com.ReactiveCocoa.RACScheduler.mainThreadScheduler"]] subscribeNext:^(NSDate * _Nullable x) {
NSLog(@"执行时 %@",[NSThread currentThread]);
}];
可以发现timer是在子线程执行的
2019-01-31 10:56:19.174662+0800 001---RAC初探[2346:137587] 执行前 <NSThread: 0x60000124e900>{number = 1, name = main}
2019-01-31 10:56:20.178857+0800 001---RAC初探[2346:137617] 执行时 <NSThread: 0x600001229d80>{number = 3, name = (null)}
2019-01-31 10:56:21.177887+0800 001---RAC初探[2346:137617] 执行时 <NSThread: 0x600001229d80>{number = 3, name = (null)}
2019-01-31 10:56:22.178262+0800 001---RAC初探[2346:137617] 执行时 <NSThread: 0x600001229d80>{number = 3, name = (null)}
2019-01-31 10:56:23.177743+0800 001---RAC初探[2346:137617] 执行时 <NSThread: 0x600001229d80>{number = 3, name = (null)}
