ios开发-格式转换

#pragma mark - NSString <-> NSData

/**

 *  字符串格式转换为数据格式
 */
+ (NSData *)dataWithString:(NSString *)string
{
    NSData * data = [string dataUsingEncoding:NSUTF8StringEncoding];
    return data;
}
/**
 *  数据格式转换为字符串格式
 */
+ (NSString *)stringWithData:(NSData *)data
{
    NSString * string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    return string;

}

#pragma mark - NSDictionary <-> JSON

/**

 *  JSON格式转换成字典格式
 */
+ (NSDictionary *)dictionaryWithJSON:(NSString *)JSON
{
    if (!JSON) {
        return nil;
    }
    NSData * data = [JSON dataUsingEncoding:NSUTF8StringEncoding];
    NSError * error = nil;
    NSDictionary * dictionary = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];
    if (error) {
        NSLog(@"JSON解析失败:%@",error);
        return nil;
    }
    return dictionary;
}
/**
 *  字典格式转换成JSON格式
 */
+ (NSString *)JSONWithDictionary:(NSDictionary *)dictionary
{
    NSError * error = nil;
    NSData * data = [NSJSONSerialization dataWithJSONObject:dictionary options:NSJSONWritingPrettyPrinted error:&error];
    NSString * JSON = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    return JSON;

}