Objective-C 学习笔记 08 - Property List

来源：互联网发布：查看端口占用命令编辑：程序博客网时间：2024/05/16 15:40

使用plist可以将应用程序的一些数据写入到文件系统中，这是一种比CoreData简单的数据管理方式。

Property list支持以下数据类型：

NSArray
NSDictionary
NSString
NSData
NSDate
NSNumber

新建名为stockz的命令行程序工程，创建多个NSMutableDictionary对象存储股票名称和持有该股票的数量，将多只股票的信息存入数组中，最后将数组写入plist文件中。

#import <Foundation/Foundation.h>int main(int argc, const char * argv[]) {    @autoreleasepool {                NSMutableArray *stocks = [[NSMutableArray alloc] init];                NSMutableDictionary *stock;                stock = [NSMutableDictionary dictionary];        [stock setObject:@"AAPL" forKey:@"symbol"];        [stock setObject:[NSNumber numberWithInt:200] forKey:@"shares"];        [stocks addObject:stock];                stock = [NSMutableDictionary dictionary];        [stock setObject:@"GOOG" forKey:@"symbol"];        [stock setObject:[NSNumber numberWithInt:160] forKey:@"shares"];        [stocks addObject:stock];                [stocks writeToFile:@"/tmp/stocks.plist" atomically:YES];            }    return 0;}

执行程序，将在/tmp目录下生成stocks.plist，其内如如下：

接下来，我们读取plist文件中的内容：

        [stocks writeToFile:@"/tmp/stocks.plist" atomically:YES];                NSArray *stockList = [NSArray arrayWithContentsOfFile:@"/tmp/stocks.plist"];        for (NSDictionary *d in stockList)        {            NSLog(@"I have %@ shares of %@", [d objectForKey:@"shares"], [d objectForKey:@"symbol"]);        }

程序执行结果如下：

I have 200 shares of AAPLI have 160 shares of GOOG

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