RAC之四（RAC常用方法）

1.代替代理

 /* 1.代替代理 */
self.textField.delegate = self;
[[self rac_signalForSelector:@selector(textFieldDidBeginEditing:)fromProtocol:@protocol(UITextFieldDelegate)] subscribeNext:^(RACTuple * _Nullable x) {
     RACTupleUnpack(UITextField *textField) = x;
     NSLog(@"textField:%@",textField);
}];

2.监听事件

 /** 2.监听事件 */
[[self.button rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(__kindof UIButton * _Nullable x) {
     self.textField.text = @"88888888888";
}];

3.代替通知

 /** 3.代替通知 */
 [[[NSNotificationCenter defaultCenter] rac_addObserverForName:@"Mr_zhang's" object:nil] subscribeNext:^(NSNotification * _Nullable x) {
     NSLog(@"----%@----",x.name);
     NSDictionary *dict = x.object;
     NSLog(@"%@",dict);
}];
NSDictionary *dict = [[NSDictionary alloc] initWithObjectsAndKeys:@"Mr_zhang",@"name",@"26",@"age",nil];
[[NSNotificationCenter defaultCenter] postNotificationName:@"Mr_zhang's" object:dict];

4.监听文本框改变

/** 4.监听文本框改变 */
[[self.textField rac_textSignal] subscribeNext:^(NSString * _Nullable x) {
     NSLog(@"%@",x);
}];

5.代替KVO

/** 4.代替KVO */
[self.textField rac_observeKeyPath:@"text" options:NSKeyValueObservingOptionOld |NSKeyValueObservingOptionNew  observer:nil block:^(id value, NSDictionary *change, BOOL causedByDealloc, BOOL affectedOnlyLastComponent) {
     //回调
     NSLog(@"value%@---%@",value,change);
}];

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    self.textField.text = @"222";
}

总结：使用RAC这些方法，可以让我们监听的事件或者使用的方法，都可以在Block回调到，代码可读性也大大提高