（十三）、iOS RAC - MVVM 登录界面

屏幕快照 2019-03-25 05.08.48 PM.png

自上至下把代码贴出来:

MVVMView.h:

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface MVVMView : UIView

@property (nonatomic, strong) UIButton *loginBtn;
@property (nonatomic, strong) UITextField *userName;
@property (nonatomic, strong) UITextField *passWord;
@end

NS_ASSUME_NONNULL_END

MVVMView.m:

@implementation MVVMView

-(instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        [self ui];
    }
    return self;
}

- (void)ui {
    
    self.userName.frame = CGRectMake(60, 120, self.frame.size.width-120, 60);
    self.passWord.frame = CGRectMake(60, CGRectGetMaxY(self.userName.frame) + 60, self.frame.size.width-120, 60);
    self.loginBtn.frame = CGRectMake(60, CGRectGetMaxY(self.passWord.frame) + 60, self.frame.size.width-120, 60);
    
    [self addSubview:self.userName];
    [self addSubview:self.passWord];
    [self addSubview:self.loginBtn];
}

- (UIButton *)loginBtn {
    if (!_loginBtn) {
        _loginBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        _loginBtn.backgroundColor = [UIColor grayColor];
        [_loginBtn setTitle:@"登录" forState:UIControlStateNormal];
        _loginBtn.selected = false;
        [_loginBtn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
    }
    return _loginBtn;
}

- (UITextField *)userName {
    if (!_userName) {
        _userName = [[UITextField alloc] initWithFrame:CGRectZero];
        _userName.backgroundColor = [UIColor grayColor];
        _userName.placeholder = @"用户名";
    }
    return _userName;
}

- (UITextField *)passWord {
    if (!_passWord) {
        _passWord = [[UITextField alloc] initWithFrame:CGRectZero];
        _passWord.backgroundColor = [UIColor grayColor];
        _passWord.placeholder = @"密码";
    }
    return _passWord;
}

@end

MVVMVC.h

#import <UIKit/UIKit.h>
NS_ASSUME_NONNULL_BEGIN

@interface MVVMVC : UIViewController

@end

NS_ASSUME_NONNULL_END

MVVMVC.m

#import "MVVMView.h"
#import "MVVMViewModel.h"
#import "ReactiveObjC.h"

@interface MVVMVC ()

@property (nonatomic, strong, readwrite) MVVMView *mvvmView;
@property (nonatomic, strong, readwrite) MVVMViewModel *mvvmViewModel;
@end

@implementation MVVMVC

- (void)viewDidLoad {
    [super viewDidLoad];
   
    [self.view addSubview:self.mvvmView];
    [self racBind];
}

- (void)racBind {
    
    RAC(self.mvvmViewModel, account) = self.mvvmView.userName.rac_textSignal;
    RAC(self.mvvmViewModel, password) = self.mvvmView.passWord.rac_textSignal;
    RAC(self.mvvmView.loginBtn, enabled) = self.mvvmViewModel.btnEnableSignal;
   
    //4、数据请求成功
    [self.mvvmViewModel.loginCommand.executionSignals.switchToLatest subscribeNext:^(id  _Nullable x) {
         NSLog(@"数据请求成功: %@",x);
    }];
    
    //3、准备工作都完成啦，现在在按钮点击的时候就执行command
    [[self.mvvmView.loginBtn rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(__kindof UIControl * _Nullable x) {
        [self.mvvmViewModel.loginCommand execute:@{@"accound":self.mvvmView.userName.text,@"password":self.mvvmView.passWord.text}];
    }];
}

- (MVVMView *)mvvmView {
    if (!_mvvmView) {
        _mvvmView = [[MVVMView alloc] initWithFrame:self.view.frame];
        _mvvmView.backgroundColor = [UIColor whiteColor];
    }
    return _mvvmView;
}

- (MVVMViewModel *)mvvmViewModel {
    if (!_mvvmViewModel) {
        _mvvmViewModel = [[MVVMViewModel alloc] init];
    }
    return _mvvmViewModel;
}
@end

MVVMViewModel.h

#import <Foundation/Foundation.h>
#import "ReactiveObjC.h"

NS_ASSUME_NONNULL_BEGIN

@interface MVVMViewModel : NSObject

@property (nonatomic, strong) RACSignal *btnEnableSignal;
@property (nonatomic, copy) NSString *account;
@property (nonatomic, copy) NSString *password;
@property (nonatomic, strong) RACCommand *loginCommand;
@end

NS_ASSUME_NONNULL_END

MVVMViewModel.m

#import "MVVMViewModel.h"

@interface MVVMViewModel()

@end

@implementation MVVMViewModel

- (instancetype)init {
    if (self = [super init]) {
        [self setUP];
    }
    return self;
}

- (void)setUP {
    
    _btnEnableSignal = [RACSignal combineLatest:@[RACObserve(self,account),RACObserve(self, password)] reduce:^id _Nullable(NSString * account,NSString * password){
        return @(account.length && (password.length > 5));
    }];
    
    _loginCommand = [[RACCommand alloc] initWithSignalBlock:^RACSignal * _Nonnull(id  _Nullable input) {
        NSLog(@"组合参数，准备发送登录请求 - %@", input);
        
        return [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
            NSLog(@"开始请求");
            
            NSLog(@"请求成功");
            
            NSLog(@"处理数据");
            
            [subscriber sendNext:@"请求后的数据"];
            [subscriber sendCompleted];
            
            return [RACDisposable disposableWithBlock:^{
                NSLog(@"结束了");
            }];
        }];
        
        return nil;
    }];
}
@end