可以先在程序打印沙盒路径：

NSLog(@"路径%@",NSHomeDirectory());

----------------------------------------------------其中一个沙盒存储更新与读取方法方法------------------------------------------------------

#import <Foundation/Foundation.h>

@interface ConfigData : NSObject

//保存到沙盒中

+ (void)saveCache:(NSString *)keyName andString:(NSString *)str;

//从沙盒中读取

+ (NSString *)getCache:(NSString *)keyName;

@end

#import "ConfigData.h"

@implementation ConfigData

+ (void)saveCache:(NSString *)keyName andString:(NSString *)str

{

    NSUserDefaults * setting = [NSUserDefaultsstandardUserDefaults];

    NSString * key = [NSStringstringWithFormat:@"OrderId-%@",keyName];

    [setting setObject:str forKey:key];

    [setting synchronize];

}

+ (NSString *)getCache:(NSString *)keyName

{

    NSUserDefaults * settings = [NSUserDefaultsstandardUserDefaults];

    NSString *key = [NSStringstringWithFormat:@"OrderId-%@",keyName];

    NSString *value = http://www.mamicode.com/[settings objectForKey:key];

    return value;

}

@end

IOS沙盒