iOS base64和NSUTF8转码

NSUTF8的编码：

NSString *tvtext=[tv_idea.text stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];//编码

NSUTF8的解码：

NSString *str_con = [dic[@"comment_content"] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

Base64编码

+ (NSString *)base64StringFromText:(NSString *)text {

NSData *data = [text dataUsingEncoding:NSUTF8StringEncoding];

NSString *base64String = [data base64EncodedStringWithOptions:0];

return base64String;

}

base64解码：

+ (NSString *)textFromBase64String:(NSString *)base64 {

NSData *data = [[NSData alloc]initWithBase64EncodedString:base64 options:0];

NSString *text = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];

return text;

}

NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];

NSString *stringBase64 = [data base64Encoding];

NSData *data = [[NSDataalloc] initWithBase64EncodedString:base64options:0];

NSString *text = [[NSStringalloc] initWithData:dataencoding:NSUTF8StringEncoding];