RAC_3.集合类

3.集合类

3.1 RACTuple——元组类,类似NSArray,用来包装值.

RACTuple *tuple = [RACTuple tupleWithObjectsFromArray:@[@"小红",@"小明",@"小小",@"Gai爷"]];
    NSString * str = tuple[0];
    NSLog(@"%@",str);

运行如图

image

3.2 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。

• ①遍历数组

    NSArray *array = @[@"小红",@"小明",@"小小",@"Gai爷"];
    [array.rac_sequence.signal subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];

运行如图

image

• ②遍历字典

简单模式

    NSDictionary *dict = @{
                           @"1":@"小明",
                           @"2":@"小红",
                           @"3":@"笑笑",
                           @"4":@"gai爷"
                           };
    [dict.rac_keySequence.signal subscribeNext:^(id  _Nullable x) {
        NSLog(@"rac_keySequence ==%@",x);
    }];
    
    [dict.rac_sequence.signal subscribeNext:^(RACTwoTuple * x) {
        NSLog(@"rac_sequence == %@ ++ %@",x[0],x[1]);
    }];

运行如图：

image

添加宏RACTupleUnpack

                           @"1":@"小明",
                           @"2":@"小红",
                           @"3":@"笑笑",
                           @"4":@"gai爷"
                           };
//    [dict.rac_keySequence.signal subscribeNext:^(id  _Nullable x) {
//        NSLog(@"rac_keySequence ==%@",x);
//    }];
    
    [dict.rac_sequence.signal subscribeNext:^(RACTwoTuple * x) {
        NSLog(@"rac_sequence == %@ ++ %@",x[0],x[1]);
        RACTupleUnpack(NSString * key,NSString * value) = x;
        NSLog(@"%@ : %@",key,value);
    }];

运行如图：

image

RACTupleUnpack是不是和我的x[0],x[1]一样

• ③字典转模型

KFC.h

#import <Foundation/Foundation.h>

@interface KFC : NSObject
@property (nonatomic,copy) NSString *name;
@property (nonatomic,copy) NSString *icon;

+ (instancetype)kfcWithDict:(NSDictionary *)dict;
@end

KFC.m

#import "KFC.h"

@implementation KFC

+ (instancetype)kfcWithDict:(NSDictionary *)dict {
    KFC *kfc  = [[KFC alloc]init];
    [kfc setValuesForKeysWithDictionary:dict];
    return kfc;
}

@end

SetViewController.m

    NSString *pathStr = [[NSBundle mainBundle]pathForResource:@"kfc.plist" ofType:nil];
    NSArray *array = [NSArray arrayWithContentsOfFile:pathStr];
    
    NSMutableArray *arrayM = [NSMutableArray arrayWithCapacity:array.count];
    
    [array.rac_sequence.signal subscribeNext:^(NSDictionary * x) {
        KFC *kfc = [KFC kfcWithDict:x];
        NSLog(@"%@",kfc);
        [arrayM addObject:kfc];
    }];

我们首先要创建一个空数组，通过模型的一个类方法将我们接收到的数据转成模型，再保存到数组中。
当然还有更爽的方法，集合的映射：它会将一个集合中的所有元素都映射成一个新的对象!

    NSString *pathStr = [[NSBundle mainBundle]pathForResource:@"kfc.plist" ofType:nil];
    NSArray *array = [NSArray arrayWithContentsOfFile:pathStr];
    
    //会将一个集合中的所有元素都映射成一个新的对象!
    NSArray * arr = [[array.rac_sequence map:^id _Nullable(NSDictionary * value) {
        //返回模型!!
        return  [KFC kfcWithDict:value];
    }] array];
    NSLog(@"%@",arr);