iOS - 数据持久化---- NSUserDefaults & NSKeyedArchiver

最新推荐文章于 2022-08-07 09:27:58 发布

原创最新推荐文章于 2022-08-07 09:27:58 发布 · 592 阅读

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#iOS #数据持久化 #NSKeyedArchiver #NSUserDefaults

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本文深入探讨了Objective-C与Swift两种编程语言在iOS开发领域的应用，包括其优势、特点以及如何在实际项目中进行选择与运用。

NSUserDefaults

//1、获取一个NSUserDefaults引用：
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
//2、保存数据
[userDefaults setInteger:1 forKey:@"segment"];
[userDefaults synchronize];
//3、读取数据
NSInteger i = [userDefaults integerForKey:@"segment"];

NSKeyedArchiver

// 数据源
NSString *str = @"abc";
NSString *astr = @"efg";
NSArray *array = [NSArray arrayWithObjects:str, astr, nil];
// 保存数据
NSString *Path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *filename = [Path stringByAppendingPathComponent:@"test.plist"];
[NSKeyedArchiver archiveRootObject:array toFile:filename];
str = @"a";
astr = @"";
//加载数据
NSArray *arr = [NSKeyedUnarchiver unarchiveObjectWithFile: filename];
str = [arr objectAtIndex:0];
astr =  [arr objectAtIndex:1];
NSLog(@"str:%@",str);
NSLog(@"astr:%@",astr);

NSUserDefaults + NSKeyedArchiver

//保存数据：
NSData *objColor = [NSKeyedArchiver archivedDataWithRootObject:[UIColor redColor]];
[[NSUserDefaults standardUserDefaults]setObject:objColor forKey:@"myColor"];
//读取数据：
NSData *objColor = [[NSUserDefaults standardUserDefaults]objectForKey:@"myColor"];
UIColor *myColor = [NSKeyedUnarchiver unarchiveObjectWithData:objColor];