young____的专栏

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {     　// 代码块 }

/* * 创建线程的方式1 */ - (void)createThread1 { // 创建线程 NSThread *thread = [[NSThread alloc] initWithTarget:self selector:@selector(download) object:nil]; // // 起线程名字 // thread.name = @"

// 睡眠5秒钟，会进入Blocked（阻塞）状态 //    [NSThread sleepForTimeInterval:5];          // 3秒后的时间     NSDate *date = [NSDate dateWithTimeIntervalSinceNow:3];     [NSThread sleepUntilDate:date];

// 初始化数据库 - (void)setupDb { // 开发数据库（连接数据库） NSString *filename = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"

// executeQuery:查询数据 // [self.db executeQuery:(NSString *), ...]; // 3. 更新 // executeUpdate：除查询数据以外的其他操作 // [self.db executeUpdate:(NSString *), ...] // 1. 打开数据库 NSString *

#import "ViewController.h" @interface ViewController () @property (weak, nonatomic) IBOutlet UIProgressView *progressView; @property (nonatomic, strong) NSURLSessionDownloadTask *task; @property

NSURLRequest *request = [NSURLRequest requestWithURL:url]; NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Null

- (void)getSession { // AFHTTPSessionManager 对 NSURLSession的封装 AFHTTPSessionManager *mgr = [AFHTTPSessionManager manager]; [mgr GET:@"" parameters:nil success:^(NSURLSessionDataTask *