lijianfei.com

常用宏

#import <ReactiveObjC/ReactiveObjC.h>
@weakify(self)
@strongify(self)

单向绑定与双向绑定

// 单向绑定
RAC(self, vcProperty) = RACObserve(self.viewModel, vmProperty);
// 双向绑定
RACChannelTo(self.textField, text) = RACChannelTo(self.viewModel, someProperty)
有什么区别?

属性观察

[[RACObserve(self.webView, estimatedProgress) takeUntil:self.rac_willDeallocSignal] subscribeNext:^(NSNumber  * _Nullable estimatedProgress) {
        NSLog(@"jeffery estimatedProgress: %@",estimatedProgress);
    }];

UIButton title 绑定

[self.button rac_liftSelector:@selector(setTitle:forState:) withSignals:RACObserve(data, nameErrorText), [RACSignal return:@(UIControlStateNormal)], nil];

监听通知

// 打破循环引用
// 通知自释放
@weakify(self)
[[[[NSNotificationCenter defaultCenter] rac_addObserverForName:UIKeyboardWillShowNotification object:nil] takeUntil:[self rac_willDeallocSignal]] subscribeNext:^(NSNotification * _Nullable sender) {
    @strongify(self)
}];

Cell 复用

[[RACObserve(data, addressText) takeUntil:self.rac_prepareForReuseSignal] subscribeNext:^(NSString*  _Nullable addressText) {
    @strongify(self)
    self.addressContentTextField.text = addressText;
}];
[[self.addressContentTextField.rac_textSignal takeUntil:self.rac_prepareForReuseSignal] subscribeNext:^(NSString * _Nullable text) {
    data.addressText = text;
}];

UITextField 双向绑定

 RACChannelTo(data, cardName) = RACChannelTo(self.nameTextField, text);
    [[self.nameTextField.rac_textSignal takeUntil:self.rac_prepareForReuseSignal] subscribe:RACChannelTo(data, cardName)];

银行卡格式

[[[self.cardNumTextField rac_signalForControlEvents:UIControlEventEditingChanged] takeUntil:self.rac_prepareForReuseSignal] subscribeNext:^(UITextField * _Nullable textField) {
        NSString *text = [[textField text] stringByReplacingOccurrencesOfString:@" " withString:@""];
        NSCharacterSet *characterSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789\b"];
        NSString *newString = @"";
        while (text.length > 0) {
            NSString *subString = [text substringToIndex:MIN(text.length, 4)];
            newString = [newString stringByAppendingString:subString];
            if (subString.length == 4) {
                newString = [newString stringByAppendingString:@" "];
            }
            text = [text substringFromIndex:MIN(text.length, 4)];
        }
        newString = [newString stringByTrimmingCharactersInSet:[characterSet invertedSet]];
        if ([newString stringByReplacingOccurrencesOfString:@" " withString:@""].length < 21) {
            [textField setText:newString];
            data.cardNumber = [newString stringByReplacingOccurrencesOfString:@" " withString:@""];
        }
    }];