读书笔记 --- 接近传感器

来源：互联网发布：明礼仪知荣辱演讲稿编辑：程序博客网时间：2024/04/20 15:01

看到这章,突然觉得,这可能是可以做出很好玩应用的一个功能,下面是代码,很简单

<span style="font-size:18px;">@implementation ViewController- (void)viewDidLoad{    [super viewDidLoad];        NSBundle *bundle = [NSBundle mainBundle];        self.imageTrashFull = [[UIImage alloc] initWithContentsOfFile:[bundle pathForResource:@"Blend Trash Full" ofType:@"png"]];    self.imageTrashEmpty = [[UIImage alloc] initWithContentsOfFile:[bundle pathForResource:@"Blend Trash Empty" ofType:@"png"]];        self.imageView.image = self.imageTrashFull;}-(void)viewWillAppear:(BOOL)animated{    [super viewWillAppear:YES];        UIDevice *device =[UIDevice currentDevice];        //开启接近传感器    device.proximityMonitoringEnabled = YES;        //设置通知    [[NSNotificationCenter defaultCenter] addObserver:self                                             selector:@selector(proximityDidChange:)                                    name:UIDeviceProximityStateDidChangeNotification                                               object:device];    }-(void)viewWillDisappear:(BOOL)animated{    [super viewWillDisappear:YES];        UIDevice *device =[UIDevice currentDevice];        // 解除通知    [[NSNotificationCenter defaultCenter] removeObserver:self                                    name:UIDeviceProximityStateDidChangeNotification                                                      object:nil];    device.proximityMonitoringEnabled = NO;}- (void)proximityDidChange:(NSNotificationCenter *)notification{    if ([[UIDevice currentDevice] proximityState] == YES)    {        NSLog(@"用户接近");        self.imageView.image = self.imageTrashEmpty;    } else {        NSLog(@"用户离开");        self.imageView.image = self.imageTrashFull;    }}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];}@end</span>

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