ReactiveCocoa(RAC)学习

开发中ReactiveCocoa(RAC)常见用法

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RAC监听按钮点击事件

[[self.button rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(id x) {    NSLog(@"RAC检测按钮点击");}];//或者:self.button.rac_command = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) {    NSLog(@"RAC检测按钮点击2");    return [RACSignal empty]; //返回空信号}];

RAC监听手势

UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] init];[[tap rac_gestureSignal] subscribeNext:^(id x) {    NSLog(@"RAC检测手势");}];self.imageView.userInteractionEnabled = YES;[self.imageView addGestureRecognizer:tap];

RAC遍历数组 / 字典

//遍历数组NSArray *array = @[@1,@3,@55,@76,@56,@45];//1>把数组转换成集合RACSequence array.rac_sequence//2>把集合RACSequence转换RACSignal信号类,array.rac_sequence.signal//3>订阅信号，激活信号，会自动把集合中的所有值，遍历出来。[array.rac_sequence.signal subscribeNext:^(id x) {    NSLog(@"RAC遍历数组元素:%@",x);}];//遍历字典NSDictionary *dict = @{@"name":@"stevin",@"location":@"Beijing"};//RACTuple:元组类,类似NSArray,用来包装值.//RACSequence:RAC中的集合类，用于代替NSArray,NSDictionary,可以使用它来快速遍历数组和字典。[dict.rac_sequence.signal subscribeNext:^(RACTuple *x) {    //解包元组，会把元组的值，按顺序给参数里面的变量赋值    RACTupleUnpack(NSString *key, NSString *value) = x;    NSLog(@"RAC遍历字典键值:%@--%@",key,value);}];

RAC观察值改变

//监听本类属性string值得变化并打印[RACObserve(self, string) subscribeNext:^(NSString *string) {    NSLog(@"RAC检测值改变:%@",string);}];

RAC监听UITextField输入

[self.textFieldName.rac_textSignal subscribeNext:^(id x) {    NSLog(@"RAC监听TextField输入:%@",x);}];[[self.textFieldName.rac_textSignal filter:^BOOL(id value) {    NSString *text = value;    //只有当文本框的内容长度大于3，才获取文本框里的内容    return text.length > 3;}] subscribeNext:^(id x) {    NSLog(@"RAC检测到输入了长度大于3的内容:%@",x);}];

RAC代替代理Delegate

[[self rac_signalForSelector:@selector(tableViewCell:buttonClick:) fromProtocol:@protocol(TableViewCellDelegate)] subscribeNext:^(id x) {    NSLog(@"RAC代理响应成功");}];

RAC观察通知Notification

[[[NSNotificationCenter defaultCenter] rac_addObserverForName:NotificationName object:nil] subscribeNext:^(NSNotification *notification) {    NSLog(@"RAC通知响应成功:%@",notification.userInfo);}];

RAC监听方法被调用

[[self rac_signalForSelector:@selector(tableView:numberOfRowsInSection:)] subscribeNext:^(id x) {    NSLog(@"tableView:numberOfRowsInSection:被调用!");}];