字典转模型 重写初始化方法

对 字典转模型 重写初始化方法 这两点的原理理解的不透彻,
但是不能太较真,拖慢学习进度,先记录下,以后或许可以比较容易理解.

#pragma mark  懒加载数据
- (NSArray *)dataArray {
    if (nil == _dataArray) {
        
        // 1. 获取文件路径
        NSString *path = [[NSBundle mainBundle] pathForResource:@"questions.plist" ofType:nil];
        
        // 2. 读取文件内容到临时数组
        NSArray *tempArray = [NSArray arrayWithContentsOfFile:path];
        
        // 3. 创建一个可变数组
        NSMutableArray *mutable = [NSMutableArray array];
        
        // 4. 遍历临时数组, 字典转模型
        for (NSDictionary *dict in tempArray) {
            GuessModel *model = [GuessModel guessModelWithDict:dict];
            
            // 添加到可变数组中
            [mutable addObject:model];
        }
        
        // 5. 把可变数组赋值给 _dataArray
        _dataArray = mutable;
        
    }
    return _dataArray;
}

#import "GuessModel.h"

@implementation GuessModel

- (instancetype)initWithDict:(NSDictionary *)dict {
    if (self = [super init]) {
        
        [self setValuesForKeysWithDictionary:dict];
    }
    return self;
}

+ (instancetype)guessModelWithDict:(NSDictionary *)dict {
    return [[self alloc] initWithDict:dict];
}

@end