字典转字符串

//两个字典--》数组 --> JSON --> 打印

```objc

NSDictionary *person = @{@"name":@"张三", @"age":@20, @"sex":@(YES), @"skills": @[@"Objective-C", @"Swift"]};

NSDictionary *secondPerson = @{@"name":@"李四", @"age":@25, @"sex":@(NO), @"skills": @[@"Ruby", @"Java"]};

NSArray *personArray = @[person, secondPerson];

/**

[{},{}]

{}

*/

//判定是否可以转

BOOL isJosnObj = [NSJSONSerialization isValidJSONObject:personArray];

if (isJosnObj) {

//personArray -> NSData(JSONData) -> NString

NSData *jsonData = [NSJSONSerialization dataWithJSONObject:personArray options:NSJSONWritingPrettyPrinted error:nil];

NSString *jsonStr = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];

NSLog(@"json字符串：%@", jsonStr);

}

```