iOS NFC

#import <CoreNFC/CoreNFC.h>


@interface ViewController ()<NFCNDEFReaderSessionDelegate>

@property (nonatomic,retain) UIButton *beginTestBtn;

@property (nonatomic,retain) UILabel *textLabel;


@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    _beginTestBtn = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 100, 50)];
    [_beginTestBtn setTitle:@"開始讀取" forState:UIControlStateNormal];
    [_beginTestBtn setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
    _beginTestBtn.titleLabel.textAlignment = NSTextAlignmentLeft;
    [_beginTestBtn addTarget:self action:@selector(beginTestBtnAction) forControlEvents:UIControlEventTouchUpInside];
    
    
    _textLabel = [[UILabel alloc]initWithFrame:CGRectMake(120, 180, 200, 50)];
    _textLabel.text = @"待讀取";
    _textLabel.textColor = [UIColor orangeColor];
    [self.view addSubview:_textLabel];
    
    NSLog(@"進入VC");
    
    [self.view addSubview:_beginTestBtn];
    [self.view addSubview:_textLabel];
    
    
    // Do any additional setup after loading the view, typically from a nib.
}


-(void)beginTestBtnAction
{
    
    /**
     三個參數
     第一個參數：代理對象
     第二個參數：線程
     第三個參數：Session讀取一個還是多個NDEF。YES：讀取一個結束，NO：讀取多個
     */
    
    NFCNDEFReaderSession *session = [[NFCNDEFReaderSession alloc] initWithDelegate:self queue:dispatch_queue_create(NULL, DISPATCH_QUEUE_CONCURRENT) invalidateAfterFirstRead:YES];
    
    [session beginSession];
    
}


/**
 代理
 */
- (void) readerSession:(nonnull NFCNDEFReaderSession *)session didDetectNDEFs:(nonnull NSArray<NFCNDEFMessage *> *)messages {
    
    __weak typeof(self) weakself=self;
    dispatch_async(dispatch_get_main_queue(), ^{
        weakself.textLabel.text = @"讀取成功";
    });
    
    for (NFCNDEFMessage *message in messages) {
        for (NFCNDEFPayload *payload in message.records) {
            NSLog(@"Payload data:%@",payload.payload);
        }
    }
}

- (void)readerSession:(NFCNDEFReaderSession *)session didInvalidateWithError:(NSError *)error{
    
     NSLog(@"error:%@",error);
    
    __weak typeof(self) weakself=self;
    dispatch_async(dispatch_get_main_queue(), ^{
        weakself.textLabel.text = @"讀取失敗";
    });
    
    
}