iOS 蓝牙开发之传输图片

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@end

/**
 *  注意: 适用于ios7或更高系统
 *
 *  首先在工程里导入MultipeerConnectivity.framework框架
 *
 */
#import "AppDelegate.h"
#import "RootViewController.h"
@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];

    UINavigationController *navi = [[UINavigationController alloc] initWithRootViewController:[[RootViewController alloc] init]];
    self.window.rootViewController = navi;

    [self.window makeKeyAndVisible];
    return YES;
}

@end

#import <UIKit/UIKit.h>

@interface RootViewController : UIViewController

@end

#import "RootViewController.h"
#import <MultipeerConnectivity/MultipeerConnectivity.h>

@interface RootViewController ()<MCAdvertiserAssistantDelegate,MCSessionDelegate,UIImagePickerControllerDelegate,UINavigationControllerDelegate,MCBrowserViewControllerDelegate>

@property (nonatomic, strong) MCSession *session;
@property (nonatomic, strong) MCAdvertiserAssistant *advertiserAssistant;
@property (nonatomic, strong) UIImagePickerController *imagePickerController;

@property (nonatomic, strong) UIImageView *imageView;
@property (nonatomic, strong) MCBrowserViewController *browserController;

@end

@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    MCPeerID *peerID = [[MCPeerID alloc] initWithDisplayName:@"蓝牙测试中..."];
    self.session = [[MCSession alloc] initWithPeer:peerID];
    self.session.delegate = self;
    //创建广播
    self.advertiserAssistant = [[MCAdvertiserAssistant alloc] initWithServiceType:@"cmj-stream" discoveryInfo:nil session:self.session];
    self.advertiserAssistant.delegate = self;

    self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(, , , )];
    self.imageView.backgroundColor = [UIColor lightGrayColor];
    [self.view addSubview:self.imageView];

    UIBarButtonItem *rightBtn = [[UIBarButtonItem alloc] initWithTitle:@"开启蓝牙" style:UIBarButtonItemStylePlain target:self action:@selector(startBtnAction:)];
    self.navigationItem.rightBarButtonItem = rightBtn;

    UIBarButtonItem *leftBtn = [[UIBarButtonItem alloc] initWithTitle:@"寻找设备" style:UIBarButtonItemStylePlain target:self action:@selector(startAdvertiser:)];
    self.navigationItem.leftBarButtonItem = leftBtn;

    UIButton *startBtn = [UIButton  buttonWithType:UIButtonTypeCustom];
    startBtn.frame = CGRectMake(, , , );
    [startBtn setTitle:@"选择图片" forState:];
    [startBtn setTitleColor:[UIColor greenColor] forState:];
    [startBtn addTarget:self action:@selector(choosePhoto:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:startBtn];

    UIButton *sendBtn = [UIButton  buttonWithType:UIButtonTypeCustom];
    sendBtn.frame = CGRectMake(, , , );
    [sendBtn setTitle:@"发送图片" forState:];
    [sendBtn setTitleColor:[UIColor greenColor] forState:];
    [sendBtn addTarget:self action:@selector(sendBtnAction:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:sendBtn];
}

- (void)sendBtnAction:(UIButton *)sender{

    if (self.imageView.image) {

        NSError *error = nil;
        [self.session sendData:UIImagePNGRepresentation(self.imageView.image) toPeers:[self.session connectedPeers] withMode:MCSessionSendDataUnreliable error:&error];
        if (error) {
            NSLog(@"发送有误：%@",error);
        }
    }
}

- (void)startBtnAction:(UIBarButtonItem *)sender{
    self.browserController = [[MCBrowserViewController alloc] initWithServiceType:@"cmj-stream" session:self.session];
    self.browserController.delegate = self;
    [self presentViewController:self.browserController animated:YES completion:nil];
}

- (void)choosePhoto:(UIButton *)sender{
    self.imagePickerController = [[UIImagePickerController alloc] init];
    self.imagePickerController.delegate = self;
    [self presentViewController:self.imagePickerController animated:YES completion:nil];
}

- (void)startAdvertiser:(UIBarButtonItem *)sender{
    NSLog(@"开始广播");
    [self.advertiserAssistant start];
}

#pragma mark - UIImagePickerController delegate -
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
    UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
    self.imageView.image = image;
    [self.imagePickerController dismissViewControllerAnimated:YES completion:nil];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
    [self.imagePickerController dismissViewControllerAnimated:YES completion:nil];
}

#pragma mark -- MCSession delegate --
-(void)session:(MCSession *)session peer:(MCPeerID *)peerID didChangeState:(MCSessionState)state{
    NSLog(@"改变状态");
    switch (state) {
        case MCSessionStateConnected:
            NSLog(@"连接成功");
            break;
        case MCSessionStateConnecting:
            NSLog(@"连接中...");
            break;
        default:
            NSLog(@"连接失败");
            break;
    }
}

- (void)session:(MCSession *)session didReceiveData:(NSData *)data fromPeer:(MCPeerID *)peerID{
    UIImage *image = [UIImage imageWithData:data];
    self.imageView.image = image;
    UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
}

#pragma mark -- MCBrowserViewController delegate --
- (void)browserViewControllerDidFinish:(MCBrowserViewController *)browserViewController{
    NSLog(@"已选中");
    [self.browserController dismissViewControllerAnimated:YES completion:nil];
}

- (void)browserViewControllerWasCancelled:(MCBrowserViewController *)browserViewController{
    NSLog(@"取消");
    [self.browserController dismissViewControllerAnimated:YES completion:nil];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end