标签：nsuserdefaults ios ios开发 沙盒 数据
1、认识一下 NSUserDefaults
平时我们可能要不离开应用程序，直接在应用程序里边设置配置的参数等，这就需要用到 NSUserDefaults，而 NSUserDefaults 是一个单例类，每个应用程序只有一个 NSUserDefaults 对象。
1）获取 NSUserDefaults 实例的方法（Getting the Shared NSUserDefaults Instance）
+ (NSUserDefaults *)standardUserDefaults：返回默认对象。
+ (void)resetStandardUserDefaults：重置用户默认对象。
2）获取默认值（Getting Default Values）
- (NSArray *)arrayForKey:(NSString *)defaultName
- (BOOL)boolForKey:(NSString *)defaultName
- (NSData *)dataForKey:(NSString *)defaultName
- (NSDictionary *)dictionaryForKey:(NSString *)defaultName
- (float)floatForKey:(NSString *)defaultName
- (NSInteger)integerForKey:(NSString *)defaultName
- (id)objectForKey:(NSString *)defaultName
- (NSArray *)stringArrayForKey:(NSString *)defaultName
- (NSString *)stringForKey:(NSString *)defaultName
- (double)doubleForKey:(NSString *)defaultName
- (NSURL *)URLForKey:(NSString *)defaultName
- (void)setBool:(BOOL)value
forKey:(NSString
*)defaultName
- (void)setFloat:(float)value
forKey:(NSString
*)defaultName
- (void)setInteger:(NSInteger)value
forKey:(NSString
*)defaultName
- (void)setObject:(id)value
forKey:(NSString
*)defaultName
- (void)setDouble:(double)value
forKey:(NSString
*)defaultName
- (void)setURL:(NSURL
*)url
forKey:(NSString
*)defaultName
还有好多好多的方法，属性，请参考官方文档。
2、代码示例
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
- (IBAction)save:(id)sender {
//获取默认配置文件
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setValue:self.userName.text forKey:@"userName"];
[userDefaults setValue:self.userPassword.text forKey:@"userPassword"];
[userDefaults setObject:self.phone.text forKey:@"phone"];
[userDefaults setObject:self.address.text forKey:@"address"];
NSArray *addList = @[self.add1.text,self.add2.text,self.add3.text];
[userDefaults setValue:addList forKey:@"addList"];
//马上提交保存
[userDefaults synchronize];
self.show.text = @"set value success";
//打印沙盒位置，方便查看（可省略）
NSLog(@"[%@]", NSHomeDirectory());
}
- (IBAction)get:(id)sender {
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSString *username = [userDefaults objectForKey:@"userName"];
NSString *userpassword = [userDefaults objectForKey:@"userPassword"];
NSString *phone = [userDefaults objectForKey:@"phone"];
NSString *address = [userDefaults objectForKey:@"address"];
NSArray *addlist = [userDefaults objectForKey:@"addList"];
[self.userName setText:username];
[self.userPassword setText:userpassword];
[self.phone setText:phone];
[self.address setText:address];
[self.add1 setText:addlist[0]];
[self.add2 setText:addlist[1]];
[self.add3 setText:addlist[2]];
self.show.text = @"get value success";
}
- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[self.userName resignFirstResponder];
[self.userPassword resignFirstResponder];
[self.phone resignFirstResponder];
[self.address resignFirstResponder];
[self.add1 resignFirstResponder];
[self.add2 resignFirstResponder];
[self.add3 resignFirstResponder];
}
@end
3、运行结果
9. iOS 编程之 使用 NSUserDefaults 读取、保存应用程序参数
标签：nsuserdefaults ios ios开发 沙盒 数据
原文地址：http://blog.csdn.net/zsfz_053/article/details/42191639
