iOS 中Base base64_encode编码

#import "ViewController.h"
#import "GTMBase64.h"


@interface ViewController (){
  
}


@end


@implementation ViewController


- (void)viewDidLoad
{
    [super viewDidLoad];


}




#pragma mark -GTMBas4 64编码


- (IBAction)codeclick:(id)sender {


    
    [self codeImg];
 
}


- (IBAction)encodeClick:(id)sender {
    [self DecodeImg];
}




#pragma mark -文字编码
-(void)TextCode{
    NSString *str=@"Hello world";
    NSData *Data=[str dataUsingEncoding:NSUTF8StringEncoding];
    //进行编码
    Data =[GTMBase64 encodeData:Data];
    NSString *codestr=[[[NSString alloc] initWithData:Data encoding:NSUTF8StringEncoding] autorelease];
    self.lbMessage.text=codestr;
}


#pragma mark -图片编码
-(void)codeImg{
    NSString *path=[[NSBundle mainBundle] pathForResource:@"school_back" ofType:@"png"];
    UIImage *img= [UIImage imageWithContentsOfFile:path];
    NSData *data=UIImageJPEGRepresentation(img, 1.0);//UIImageJPEGRepresentation返回图片较小，但是清晰度模糊
//    NSData *data=UIImagePNGRepresentation(img);//UIImagePNGRepresentation图片大，清晰


   data= [GTMBase64 encodeData:data];
    NSLog(@"-->%@",[[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease]);
    self.lbMessage.text=[[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
}


//==========================


#pragma mark -文字解码
-(void)TextDecode{
    NSString *codeStr=self.lbMessage.text;
    NSData *data=[codeStr dataUsingEncoding:NSUTF8StringEncoding];
    data=  [GTMBase64 decodeData:data];
    self.lbMessage.text=[[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
}


#pragma mark -图片解码
-(void)DecodeImg{
    NSString *codestr=self.lbMessage.text;
    NSData *data=[codestr dataUsingEncoding:NSUTF8StringEncoding];
    data=[GTMBase64 decodeData:data];
    UIImage *ima=[UIImage imageWithData:data];
    self.img.image=ima;
}


- (void)dealloc {
    [_lbMessage release];
    [_img release];
    [super dealloc];
}
@end

添加一个实际应用的例子：

这是我在做项目的时候的一个登陆功能，用到了

Base base64_encode编码，数据解析我用的自带的解析方式：

-(void)loginBtnClicked{
    
    if (_nameText.text.length==0) {
        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"" message:@"请输入手机号或用户名" preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
        [alertController addAction:cancelAction];
        [self presentViewController:alertController animated:YES completion:nil];
        
    } else if ([_passwordText.text isEqual:@""]) {
        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"" message:@"请输入密码" preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
       
        [alertController addAction:cancelAction];
  
        [self presentViewController:alertController animated:YES completion:nil];
        
    } else {
        
        NSString *str1 = _nameText.text;
        NSString *str2 = _passwordText.text;
        NSString *originStr = [NSString stringWithFormat:@"%@:%@",str1,str2];
        NSData* originData = [originStr dataUsingEncoding:NSUTF8StringEncoding];
        
        _encodeResult=[NSString stringWithFormat:@"%@ %@",@"Base",[originData base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithLineFeed]];
 
        NSURL *url=[NSURL URLWithString:@"http://api.pcitcsh.com/member?client=1&version=3.0"];
        
        NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:url];
        request.HTTPMethod=@"POST";
        
        //请求头
       [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
        
        [request setValue:_encodeResult forHTTPHeaderField:@"Authorization"];
        
        //请求体
        NSDictionary *json=@{
                            @"action":@"login"
                            };
        
        NSData *data=[NSJSONSerialization dataWithJSONObject:json options:NSJSONWritingPrettyPrinted error:nil];
        request.HTTPBody=data;
        
        //判断网络连接
       if ([self isConnectionAvailable]) {
     
            [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
                
                //解析回调数据
                
                NSDictionary *dict=[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
                NSString *strError=dict[@"message"];
                NSString *strPhone = @"";
                
                if (dict[@"data"] != nil) {
                    NSDictionary *dic = dict[@"data"];
                    if (dic.count > 0) {
                        if ([[dic allKeys] containsObject:@"mobile"]) {//如果字典中存在“mobile”这个字段就把他取出来
                            strPhone = [dic valueForKey:@"mobile"];
                        }
                    }
                }

                
                if ([strError isEqualToString:@"操作成功"])
                {
                    //存储登陆名和密码以及手机号码
                    NSUserDefaults *userdefault=[NSUserDefaults standardUserDefaults];
                    [userdefault setObject:_nameText.text forKey:@"username"];
                    [userdefault setObject:_passwordText.text forKey:@"password"];
                    [userdefault setObject:strPhone forKey:@"mobile"];

                    //同步
                    [userdefault synchronize];
                    WelcomeController *welcomeView = [[WelcomeController alloc]init];
                    [self.navigationController pushViewController:welcomeView animated:YES];
            
                }
                else
                {
                    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"用户名或密码错误！" preferredStyle:UIAlertControllerStyleAlert];
                    UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleCancel handler:nil];
                    [alert addAction:cancel];
                    [self presentViewController:alert animated:YES completion:nil];
                    
                }
                
                
            }];
       }else{
           
           //提示网络连接
           UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"请检查网络连接！" preferredStyle:UIAlertControllerStyleAlert];
           UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleCancel handler:nil];
           [alert addAction:cancel];
           [self presentViewController:alert animated:YES completion:nil];

       }
  
    }
    
}