偏好设置

界面图:

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (IBAction)save:(id)sender {
    // 单例对象
    NSUserDefaults *def =  [NSUserDefaults standardUserDefaults];
    [def setObject:@"xmg" forKey:@"name"];
    [def setInteger:10 forKey:@"age"];
    //立即写入，现在iOS9之后，这句话可以不写
    [def synchronize];
}

- (IBAction)read:(id)sender {

    //从偏好设置里面获取数据
    // 单例对象
    NSUserDefaults *def =  [NSUserDefaults standardUserDefaults];
    NSString *name = [def objectForKey:@"name"];
    NSInteger age = [def integerForKey:@"age"];

    NSLog(@"name = %@,age = %ld",name,age);


}

- (void)viewDidLoad {
    [super viewDidLoad];
    NSLog(@"%@",NSHomeDirectory());
}

@end

程序运行前:Preferences目录图片:

程序运行后，点击保存按钮Preferences目录效果图片:

程序运行后，点击读取按钮效果图片:

• 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