// 偏好设置---------------------------------
// 存储基本类型数据
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:@"hello world!" forKey:@"testsavekey"];
// 强制保存,否则需要等系统保存，时间不定
[defaults synchronize];
// 取数据
NSString *testStr = [defaults objectForKey:@"testsavekey"];
NSLog(@"testStr = %@", testStr);
// 数据存储plist-----------------------------
// Document路径获取
NSArray *documentPathArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentPath = [documentPathArray firstObject];
NSLog(@"document path = %@", documentPath);
NSString *filePath = [documentPath stringByAppendingPathComponent:@"test.plist"];
// 数据写入文件
NSMutableDictionary *dic = [[NSMutableDictionary alloc]initWithCapacity:1];
[dic setObject:@"hello" forKey:@"key1"];
[dic setObject:@"world !" forKey:@"key2"];
[dic writeToFile:filePath atomically:YES];
// 读取数据
NSDictionary *readDic = [NSDictionary dictionaryWithContentsOfFile:filePath];
NSLog(@"readDic = %@", readDic);
原文：http://www.cnblogs.com/xiangjune/p/4971953.html