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监听Documents文件夹内文件发生改变
// 当Documents内文件发生改变时,启动计时器,每秒计算一次大小,当大小不发生改变时说明传输完毕,就开始刷新。 @property (nonatomic, strong) NSTimer *timer; // 原Documents内文件大小 @property (nonatomic, assign) NSInteger filesSize; // Documents内文件改变后的大小 @property (nonatomic, assign) NSInteger foundSize;
- (NSTimer *)timer { if (!_timer) { _timer = [[NSTimer alloc] init]; [_timer setFireDate:[NSDate distantFuture]]; } return _timer; }
- (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor = [UIColor whiteColor]; _fileManager = [NSFileManager defaultManager]; self.timer = [NSTimer scheduledTimerWithTimeInterval:1.f target:self selector:@selector(compareSize) userInfo:nil repeats:YES]; [self.timer setFireDate:[NSDate distantFuture]]; //** 监听Documents文件夹内的文件是否变化 int const folderdescriptor = open([kDocumentPath fileSystemRepresentation], O_EVTONLY); dispatch_source_t _directorySource = dispatch_source_create(DISPATCH_SOURCE_TYPE_VNODE, folderdescriptor, DISPATCH_VNODE_WRITE, DISPATCH_TARGET_QUEUE_DEFAULT); dispatch_source_set_event_handler(_directorySource, ^{ unsigned long const data =http://www.mamicode.com/ dispatch_source_get_data(_directorySource); if (data & DISPATCH_VNODE_WRITE) { // Do all the work on the main thread, // including timer scheduling, notifications delivering dispatch_async(dispatch_get_main_queue(), ^{ [self directoryDidChanger]; }); } }); dispatch_source_set_cancel_handler(_directorySource, ^{ close(folderdescriptor); }); dispatch_resume(_directorySource); }
// 当Documengs文件夹内文件发送改变时 - (void)directoryDidChanger { _filesSize = [self getSizeOfFilePath:kDocumentPath]; dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.f * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ [self.timer setFireDate:[NSDate date]]; }); } - (void)dealloc { // 移除计时器 [self.timer invalidate]; } // 获取所有文件 - (NSArray *)directoryFiles { NSArray *files = [_fileManager subpathsAtPath:kDocumentPath]; return files; } // 比较文件大小,以此监听是否还在传输文件 - (void)compareSize { _foundSize = [self getSizeOfFilePath:kDocumentPath]; if (_foundSize == _filesSize) { // 如果大小没有再发生改变则刷新数据 [self.timer setFireDate:[NSDate distantFuture]]; [self selectDate]; // 开始刷新数据 } _filesSize = _foundSize; }
监听Documents文件夹内文件发生改变
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