RicdeTmp#TechNote#NSArray、NSDictionary与NSData的相互转换1

**Table of Contents** *generated with [DocToc](https://github.com/thlorenz/doctoc)* - [NSDictionary -> NSData](#nsdictionary---nsdata) - [NSData -> NSDictionary](#nsdata---nsdictionary) - [NSArray -> NSData](#nsarray---nsdata) - [NSData -> NSArray](#nsdata---nsarray) # NSDictionary -> NSData ```objective-c // 方法1：NSKeyedArchiver NSDictionary *dict = @{ @"key1": @"value1", @"key1": @"value2" }; NSData *data = [NSKeyedArchiver archivedDataWithRootObject:dict]; // 方法2：NSJSONSerialization NSError *writeError = nil; NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&writeError]; if (writeError != nil) { NSLog(@"Convent to JSON failed: %@", [writeError localizedDescription]); return; } ``` # NSData -> NSDictionary ```objective-c // 方法1：