用过的库

GameKit.framework

#import <GameKit/GameKit.h>

@interface ViewController :UIViewController<GKPeerPickerControllerDelegate,GKSessionDelegate>

@property (strong,nonatomic) GKSession* currentSession;

@property (strong,nonatomic) GKPeerPickerController* picker;

AVFoundation.framework 音频播放 

#import <AVFoundation/AVFoundation.h>

@property (nonatomic,retain)AVAudioPlayer *player;

MediaPlayer.framework  视频播放 ，

#import <MediaPlayer/MediaPlayer.h>

@property (strong,nonatomic)MPMoviePlayerViewController *m_pMoviePlayerC;

ASIHttpRequest （）//ASIHttpLib

封装CFNetwork API，适用于HTTP请求，和基于REST的服务之间的交互。

#import "ASIHTTPRequest.h"

@interface ViewController :UIViewController<ASIHTTPRequestDelegate,NSXMLParserDelegate>

-(IBAction)btnTestGet:(id)sender;

-(IBAction)btnTestPost:(id)sender;

验证码：文字转换到图片上显示