ReactiveCocoa代码实践之-UI组件的RAC信号操作

// 拖线的UI控件
@property (weak, nonatomic) IBOutlet UIView *topView;
@property (weak, nonatomic) IBOutlet UISlider *slider;
@property (weak, nonatomic) IBOutlet UISlider *slider;
@property (weak, nonatomic) IBOutlet UISlider *slider;
// viewDidLoad中
// 分别将三个控件的改变都包成一个信号。
RACSignal *s = [[self.slider rac_newValueChannelWithNilValue:@]startWith:@];
RACSignal *s = [[self.slider rac_newValueChannelWithNilValue:@]startWith:@];
RACSignal *s = [[self.slider rac_newValueChannelWithNilValue:@]startWith:@];
RACSignal *threeSignal = [RACSignal combineLatest:@[s,s,s] reduce:^id(NSNumber* value,NSNumber* value,NSNumber* value){
return @[value,value,value];
}];
// 监听这个"合成"后的信号，改变view的颜色
[threeSignal subscribeNext:^(NSArray *arr) {
self.topView.backgroundColor = [UIColor colorWithRed:[arr[] doubleValue] green:[arr[] doubleValue] blue:[arr[] doubleValue] alpha:];
}]; 

RACSignal *s1 = [[[self.slider1 rac_signalForControlEvents:UIControlEventValueChanged] map:^id(id value) {
return @(self.slider1.value);
}] startWith:@0];

@property (weak, nonatomic) IBOutlet UITextField *accountTxt;
@property (weak, nonatomic) IBOutlet UITextField *pwdTxt;
@property (weak, nonatomic) IBOutlet SXSwitch *agreeSw; // 同意条款
@property (weak, nonatomic) IBOutlet UIButton *loginBtn; // 注册按钮
// viewDidLoad方法
self.loginBtn.enabled = NO;
RAC(self.loginBtn , enabled) = [RACSignal combineLatest:@[self.accountTxt.rac_textSignal , self.pwdTxt.rac_textSignal, self.agreeSw.rac_newOnChannel] reduce:^(NSString *account, NSString *pwd, NSNumber *isOn){
return @((account.length > )&&(pwd.length >)&&[isOn boolValue]);
}]; 

RAC(self, timeLabel.text) = [[[RACSignal interval: onScheduler:[RACScheduler currentScheduler]] startWith:[NSDate date]] map:^id (NSDate *value) {
NSDateComponents *dateCompOnents= [[NSCalendar currentCalendar] components:NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond fromDate:value];
return [NSString stringWithFormat:@"%ld:%ld:%ld", (long)dateComponents.hour, (long)dateComponents.minute, (long)dateComponents.second];
}];

[[self.seg rac_newSelectedSegmentIndexChannelWithNilValue:@]subscribeNext:^(id x) {
// 返回的基本数据类型都被装包成NSNumber，可在此做一些判断操作
NSLog(@"selectIndex-%@",x);
}];

[[picker rac_newDateChannelWithNilValue:[NSDate date]]subscribeNext:^(NSDate *x) {
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = @"HH:mm";
dateFormatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"];
NSString *dateStr = [dateFormatter stringFromDate:x];
}]; 

// UITableViewDataSource
- (UITableViewCell *)tableView:(nonnull UITableView *)tableView cellForRowAtIndexPath:(nonnull NSIndexPath *)indexPath {
SXFeedbackCell * cell = [tableView dequeueReusableCellWithIdentifier:@"SXFeedbackCell"];
@weakify(self)
[[[cell.replyButton rac_signalForControlEvents:UIControlEventTouchUpInside] takeUntil:cell.rac_prepareForReuseSignal]
subscribeNext:^(UIButton *x) {
@strongify(self)
// 处理一些其他逻辑
[self.navigationController pushViewController:[SXReplyPage new] animated:YES];
}];
return cell;
}
// UICollectionViewDataSource
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell * cell = [collectionView dequeueReusableCellWithIdentifier:@"SXDownloadCell"];
[[[cell.changeBtn rac_signalForControlEvents:UIControlEventTouchUpInside] takeUntil:cell.rac_prepareForReuseSignal]
subscribeNext:^(UIButton *x) {
cell.backgroundColor = [UIColor grayColor];
}];
return cell;
}

// rac_textSignal源码
- (RACSignal *)rac_textSignal {
@weakify(self);
return [[[[[RACSignal
defer:^{
@strongify(self);
return [RACSignal return:self];
}]
concat:[self rac_signalForControlEvents:UIControlEventAllEditingEvents]]
map:^(UITextField *x) {
return x.text;
}]
takeUntil:self.rac_willDeallocSignal]
setNameWithFormat:@"%@ -rac_textSignal", self.rac_description];
}
// rac_signalForControlEvents源码
- (RACSignal *)rac_signalForControlEvents:(UIControlEvents)controlEvents {
@weakify(self);
return [[RACSignal
createSignal:^(id subscriber) {
@strongify(self);
[self addTarget:subscriber action:@selector(sendNext:) forControlEvents:controlEvents];
[self.rac_deallocDisposable addDisposable:[RACDisposable disposableWithBlock:^{
[subscriber sendCompleted];
}]];
return [RACDisposable disposableWithBlock:^{
@strongify(self);
[self removeTarget:subscriber action:@selector(sendNext:) forControlEvents:controlEvents];
}];
}]
setNameWithFormat:@"%@ -rac_signalForControlEvents: %lx", self.rac_description, (unsigned long)controlEvents];
}