/*

 1.设置UI界面

 2.引入框架

 3.点击选择照片

 4.连接蓝牙设备

 5.实现蓝牙的代理方法

 6.发送照片

 */

#import "ViewController.h"

#import <GameKit/GameKit.h>

@interface ViewController ()<UINavigationControllerDelegate, UIImagePickerControllerDelegate, GKPeerPickerControllerDelegate>

@property (nonatomic, strong) UIImageView *imgView;

@property (nonatomic, strong) UIButton *selectImgBtn;

@property (nonatomic, strong) UIButton *connectionDeviceBtn;

@property (nonatomic, strong) UIButton *sendImgBtn;

@property (nonatomic, strong) GKSession *seccion; // first deprecated in iOS 7.0 

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    _imgView = [[UIImageView alloc] initWithFrame:CGRectMake(, , self.view.bounds.size.width - , self.view.bounds.size.width - )];

    _imgView.backgroundColor = [UIColor lightGrayColor];

    [self.view addSubview:_imgView];

    _selectImgBtn = [UIButton buttonWithType:UIButtonTypeSystem];

    _selectImgBtn.frame = CGRectMake(, CGRectGetMaxY(_imgView.frame) + , , );

    [_selectImgBtn setTitle:@"选择照片" forState:UIControlStateNormal];

    [self.view addSubview:_selectImgBtn];

    [_selectImgBtn addTarget:self action:@selector(clickSelectImgBtnAction) forControlEvents:UIControlEventTouchUpInside];

    _connectionDeviceBtn = [UIButton buttonWithType:UIButtonTypeSystem];

    _connectionDeviceBtn.frame = CGRectMake(, , , );

    CGPoint p = CGPointMake(self.view.center.x, _selectImgBtn.center.y);

    _connectionDeviceBtn.center = p;

    [_connectionDeviceBtn setTitle:@"连接设备" forState:UIControlStateNormal];

    [self.view addSubview:_connectionDeviceBtn];

    [_connectionDeviceBtn addTarget:self action:@selector(clickConnectionDeviceBtnAction) forControlEvents:UIControlEventTouchUpInside];

    _sendImgBtn = [UIButton buttonWithType:UIButtonTypeSystem];

    _sendImgBtn.frame = CGRectMake(self.view.bounds.size.width - , CGRectGetMinY(_selectImgBtn.frame), , );

    [_sendImgBtn setTitle:@"发送照片" forState:UIControlStateNormal];

    [self.view addSubview:_sendImgBtn];

    [_sendImgBtn addTarget:self action:@selector(clickSendImgBtnAction) forControlEvents:UIControlEventTouchUpInside];

}

// 选择图片

- (void)clickSelectImgBtnAction {

    // 0.判断照片是否可用

    if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {

        return;

    }

    // 1.创建控制器

    UIImagePickerController *ipc = [UIImagePickerController new];

    // 2.设置图片源

    ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    // 3.设置代理

    ipc.delegate = self;

    // 4.显示控制器

    [self presentViewController:ipc animated:YES completion:nil];

}

// 连接设备

- (void)clickConnectionDeviceBtnAction {

    // 1.创建控制器

    GKPeerPickerController *pic = [GKPeerPickerController new];  // first deprecated in iOS 7.0

    // 2.连接设备获取数据

    pic.delegate = self;

    // 3.显示控制器

    [pic show];

}

// 发送图片

- (void)clickSendImgBtnAction {

    // 0.需要一个data对象，把图片转化成data数据

    // CGFloat compressionQuality 精度，压缩比

    NSData *data = UIImageJPEGRepresentation(self.imgView.image, 0.2);

    // 1.通过session发送数据

    /*

     数据报（数据包，小块）

     GKSendDataReliable, 网络数据发送有误的时候，可以保证消息按照发送的顺序到达

     GKSendDataUnreliable 只发一次

     */

    [self.seccion sendDataToAllPeers:data withDataMode:GKSendDataReliable error:nil]; // first deprecated in iOS 7.0

} 

#pragma 相册的代理 
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info {

　　NSLog(@"--info-- = %@", info); 
　　UIImage *image = info[UIImagePickerControllerOriginalImage]; 
　　_imgView.image = image; 
　　[picker dismissViewControllerAnimated:YES completion:nil]; 
} 

#pragma mark - GKPeerPickerControllerDelegate 
- (void)peerPickerController:(GKPeerPickerController *)picker didConnectPeer:(NSString *)peerID toSession:(GKSession *)session { 

　　self.seccion = session; 

　　// 1.设置session会话，Handler（句柄，类似代理）  
　　[session setDataReceiveHandler:self withContext:nil]; 

　　// 2.控制器的移除  
　　[picker dismiss]; 
} 

// 从setDataReceiveHandler里面找出来 
- (void)receiveData:(NSData *)data formPeer:(NSString *)peer inSession:(GKSession *)session context:(void *)context { 

　　UIImage *image = [UIImage imageWithData:data]; 
　　_imgView.image = image; 
}