ReactiveCocoa操作
map ：映射
textField.rac_textSigal map:^id(NSString* value){
return @(value.length);
} subscribeNext:^(NSString* x){
NSLog(@“%@“,x);
}
打印：
0 1 2 3 4
filter ： 过滤
textField.rac_textSigal filter:BOOL(NSString* value){
return value.length > 3;
}
delay: 延时
设置延时两秒后发送消息
[[[RACSignal createSignal:^RACDisposable*(id subscriber){
[subscriber sendNext:@“ricke”];
[subscriber sendCompleted];
return nil;
}] delay:2]
subscribeNext:^(id x){
NSLog(@“%@”,x);
}];
startWith: 在发送消息之前，先发送一个消息
[[[RACSignal createSignal:^RACDisposable* (id subscriber){
[subscriber sendNext:@“next”];
[subscriber sendCompleted];
return nil;
}] startWith:@“RAC”]
subscriberNext:^(id x){
NSLog(@“%@”,x);
}];
timeout :超时
[[[RACSignalcreateSignal:^RACDisposable* (idsubscriber){
[[RACSchedulermainThreadScheduler]afterDelay:3schedule:^{
[subscribersendNext:@"sned"];
[subscribersendCompleted];
}];
returnnil;
}]timeout:2onScheduler:[RACSchedulermainThreadScheduler]]
subscribeNext:^(idx) {
NSLog(@"%@",x);
}];
take :发送多个消息的时候，取最前面的几条
[[[RACSignalcreateSignal:^RACDisposable*(id subscriber) {
[subscribersendNext:@"1"];
[subscribersendNext:@"2"];
[subscribersendNext:@"3"];
[subscribersendNext:@"4"];
[subscribersendNext:@"5"];
[subscribersendCompleted];
returnnil;
}]take:2]
subscribeNext:^(idx) {
NSLog(@"%@",x);
}];
takelast : 发送多条消息的时候，取最后面的几条
[[[RACSignalcreateSignal:^RACDisposable*(id subscriber) {
[subscribersendNext:@"1"];
[subscribersendNext:@"2"];
[subscribersendNext:@"3"];
[subscribersendNext:@"4"];
[subscribersendNext:@"5"];
[subscribersendNext:@"6"];
[subscribersendCompleted];
returnnil;
}]takeLast:3]
subscribeNext:^(idx) {
NSLog(@"%@",x);
}];
takeUntil :RACSignal (发送在takeUntil后面的信号完成前的消息)
//RAC这个消息是2秒后完成，所以1、2这两个消息是可以发送到，而3秒后3、4就不会发送
[[[RACSignalcreateSignal:^RACDisposable*(id subscriber) {
[subscribersendNext:@"1"];
[subscribersendNext:@"2"];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3*NSEC_PER_SEC)),dispatch_get_main_queue(), ^{
[subscribersendNext:@"3"];
[subscribersendNext:@"4"];
[subscribersendCompleted];
});
[subscribersendCompleted];
returnnil;
}]takeUntil:[RACSignalcreateSignal:^RACDisposable*(id subscriber) {
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2*NSEC_PER_SEC)),dispatch_get_main_queue(), ^{
[subscribersendNext:@"RAC"];
[subscribersendCompleted];
});
returnnil;
}]]
subscribeNext:^(idx) {
NSLog(@"%@",x);
}];
takeWhileBlock :但takeWhileBlock返回YES的时候发送消息
[[[RACSignalcreateSignal:^RACDisposable*(id subscriber) {
[subscribersendNext:@"1"];
[subscribersendNext:@"2"];
[subscribersendNext:@"3"];
[subscribersendNext:@"4"];
[subscribersendNext:@"5"];
[subscribersendCompleted];
returnnil;
}]takeWhileBlock:^BOOL(idx) {
returnYES;
}]
subscribeNext:^(idx) {
NSLog(@"%@",x);
}];
skip: 跳过
[[[RACSignalcreateSignal:^RACDisposable*(id subscriber) {
[subscribersendNext:@"1"];
[subscribersendNext:@"2"];
[subscribersendNext:@"3"];
[subscribersendNext:@"4"];
[subscribersendNext:@"5"];
[subscribersendNext:@"6"];
[subscribersendCompleted];
returnnil;
}]skip:2]
subscribeNext:^(idx) {
NSLog(@"%@",x);
}];
skipWhileBlock 和skipUntilBlock
skipWhileBlock :当block返回YES的时候跳过，返回NO的时候发送
skipUntilBlock：skipUntilBlock和skipWhileBlock相反，当block返回NO的时候跳，返回YES的时候发送
throttle （节流）优化请求时间间隔
throttle： 设置一个间隔时间，当两次信号之间的时间差小于这个时间就不会发送请求
[[textField.rac_textSignalthrottle:0.3]
subscribeNext:^(idx) {
NSLog(@"%@",x);
}];
distinctUntilChanged: 优化请求字符一样的时候（当后一个请求和钱一个请求一样的时候，就可以不用请求）
[[[textField.rac_textSignalthrottle:0.3]distinctUntilChanged]
subscribeNext:^(idx) {
NSLog(@"%@",x);
}];
ignore : 忽略某些 例如上面的空字符
[[[[textField.rac_textSignalthrottle:0.3]distinctUntilChanged]ignore:@""]
subscribeNext:^(idx) {
NSLog(@"%@",x);
}];
switchToLatest : 当你请求数据的时候、网络会有延迟，数据还没有返回回来，这时候你发送了新的请求，则我们取消前一次的请求，只发送最新的请求
[[[[[[textField.rac_textSignalthrottle:0.3]distinctUntilChanged]ignore:@""]
map:^id(idvalue) {
return[RACSignalcreateSignal:^RACDisposable*(id subscriber) {
[subscribersendNext:@"request"];
[subscribersendCompleted];
returnnil;
}];
}]switchToLatest]
subscribeNext:^(idx) {
NSLog(@"--request---%@",x);
}];
多个信号处理
merge ：同时订阅2个信号
RACSignal* signalA = [RACSignalcreateSignal:^RACDisposable*(id subscriber) {
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2*NSEC_PER_SEC)),dispatch_get_main_queue(), ^{
[subscribersendNext:@"SignalA"];
[subscribersendCompleted];
});
returnnil;
}];
RACSignal* signalB = [RACSignalcreateSignal:^RACDisposable*(id subscriber) {
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(5*NSEC_PER_SEC)),dispatch_get_main_queue(), ^{
[subscribersendNext:@"signalB"];
[subscribersendCompleted];
});
returnnil;
}];
[[signalAmerge:signalB]subscribeNext:^(idx) {
NSLog(@"%@",x);
}];
concat
singleA 完成后才会订阅signalB有点像串行队列 A失败了B就不会被订阅
[[signalAconcat:signalB]subscribeNext:^(idx) {
NSLog(@"%@",x);
}];
zipWith 和 combineLatest: 每个信号都至少要发送一次才可以被订阅
[[signalAzipWith:signalB]subscribeNext:^(idx) {
NSLog(@"%@",x);
}];
[[RACSignalcombineLatest:@[signalA,signalB]]subscribeNext:^(idx) {
NSLog(@"%@",x);
}];
RAC中的宏：
RAC(self.titleLabel,text) = [RACSignal interval:1onScheduler:[RACScheduler mainThreadScheduler]]map:^id(NSData* value) {
returnvalue.description;
}
属性监听
RACObserve(self.menuButton, enabled)
