JSON解析的几种方法?
JSONKit(第三方的解析工具) , NSJSONSerialization (系统提供的解析类,其解析效率最高)

普通方法

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    NSString *path = [[NSBundle mainBundle] pathForResource:@"JSON_stu" ofType:@"txt"];
    
    NSData *data = [NSData dataWithContentsOfFile:path];
    
    /*NSJSONReadingMutableContainers = (1UL << 0), //返回一个数组或者字典
     NSJSONReadingMutableLeaves = (1UL << 1), //返回一个字符串
     NSJSONReadingAllowFragments = (1UL << 2) //返回一个任意类型的对象
     */
    
    //找到最小的数组套字典的
    NSArray *array = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
    
    NSLog(@"array == %@", array);
    
    for (NSDictionary *dic in array) {

        NSLog(@"dic === %@", [dic objectForKey:@"content"]);  
    }
}

调用第三方库的方法

1. 文件夹中添加资源文件
2. 引入第三方框架 #import "JSONKit.h"
3. 修改混编模式

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
     NSString *path = [[NSBundle mainBundle] pathForResource:@"JSON_stu" ofType:@"txt"];
     NSData *data = [NSData dataWithContentsOfFile:path]; 
     NSArray *array = [data objectFromJSONData];
     NSLog(@"array = %@",array);
}