界面图:

NSDocumentDirectory表示的目录图片:

NSCachesDirectory表示的目录图片:

//NSHomeDirectory()获取沙盒根目录
//NSLog(@"%@",NSHomeDirectory());

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    //NSHomeDirectory()获取沙盒根目录
    //NSLog(@"%@",NSHomeDirectory());

    //获取指定的目录
    NSString *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];

    NSLog(@"%@",path);

}

// plist存储

// 保存到plist
- (IBAction)save:(id)sender {


    // 获取指定的目录
    // NSUserDomainMask,默认手机开发的话，就填该参数
    // YES是表示详细目录，如果填NO的话，那么前面的目录默认会用~表示，这个~在电脑可以识别，在手机里面是不能识别的，所以默认也用YES
    NSString *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];

    NSArray *array = @[@"xmg",@10];


    // 拼接路径名称
    //NSString *filePath = [path stringByAppendingString:@"array.plist"];
    NSString *filePath = [path stringByAppendingPathComponent:@"array.plist"];
    NSLog(@"%@",filePath);
    //把数组写入到文件
    [array writeToFile:filePath atomically:YES];

    //把字典写入到文件
    NSDictionary *dict = @{@"name" : @"xmg",@"age" : @10};
    NSString *dictFilePath = [path stringByAppendingPathComponent:@"dict.plist"];
    [dict writeToFile:dictFilePath atomically:YES];

}

// 从plist中加载
- (IBAction)read:(id)sender {

    //获取指定的目录
    NSString *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
    NSString *filePath = [path stringByAppendingPathComponent:@"array.plist"];

      NSString *dictFilePath = [path stringByAppendingPathComponent:@"dict.plist"];

    NSArray *array = [NSArray arrayWithContentsOfFile:filePath];

    NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:dictFilePath];

    NSLog(@"%@",array);
    NSLog(@"%@",dict);

}

@end

程序运行前:沙盒根目录图片:

程序运行后，点击保存按钮效果图片:

• 注意，plist方式存储和偏好设置方式存储不能存放自定义对象要想，存放自定义对象，可以通过归档方式存储