TRVSURLSessionOperation 0.0.1

TRVSURLSessionOperation 0.0.1

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测试已测试✗
语言语言 Obj-CObjective C
许可证 MIT
发布上次发布2014年12月

由Travis Jeffery维护。

TRVSURLSessionOperation 0.0.1

  • 由
  • Travis Jeffery

由@travisjeffery。

TRVSURLSessionOperation是NSOperation的子类，它包装了NSURLSessionTask，使得您可以在NSOperationQueue中使用它们。

使用它可以

  • 安排网络请求（例如，先运行请求A，再运行请求B，并给请求设置优先级）
  • 限制并发网络请求的数量（例如，在任何给定时间内有5个网络请求运行）
  • 与其他NSOperation对象一样控制这些网络操作（例如，您有一个创建图像的NSOperation，然后是一个将图像上传到网络服务的TRVSURLSessionOperation）

使用方法

NSOperationQueue *queue = [[NSOperationQueue alloc] init];
NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];

[queue addOperation:[[TRVSURLSessionOperation alloc] initWithSession:session request:[NSURLRequest requestWithURL:@"https://twitter.com/travisjeffery"] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { ... }]];

在另一个特定请求完成后运行请求

例如，您有一个初始化请求用于登录用户或获取他们的设置，并希望后续请求等待初始请求完成后再运行。

NSOperationQueue *queue = [[NSOperationQueue alloc] init];
NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];

TRVSURLSessionOperation *settingsOperation = [[TRVSURLSessionOperation alloc] initWithSession:session request:[NSURLRequest requestWithURL:@"..."] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { ... }];

TRVSURLSessionOperation *anotherOperation = [[TRVSURLSessionOperation alloc] initWithSession:session request:[NSURLRequest requestWithURL:@"..."] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { ... }];

// get some settings for your app from your server, and queue subsequent requests that depend on those settings.
[anotherOperation addDependency:settingsOperation];

[queue addOperations:@[ loginOperation, settingsOperation ] waitUntilAllOperationsAreFinished:NO];

暂停和恢复/挂起请求执行

NSOperationQueue *queue = [[NSOperation alloc] init];
queue.suspended = YES;

// these request/operations won't run
[queue addOperation:[[TRVSURLSessionOperation alloc] initWithSession:session request:[NSURLRequest requestWithURL:@"https://twitter.com/travisjeffery"] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { ... }]];

[queue addOperation:[[TRVSURLSessionOperation alloc] initWithSession:session request:[NSURLRequest requestWithURL:@"https://github.com/travisjeffery"] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { ... }]];

queue.suspended = NO;
// until now

限制并发请求数量

NSOperationQueue *queue = [[NSOperationQueue alloc] init];
queue.maxConcurrentOperationCount = 1; // only one request will run at once

NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];

[queue addOperation:[[TRVSURLSessionOperation alloc] initWithSession:session request:[NSURLRequest requestWithURL:@"https://twitter.com/travisjeffery"] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { ... }]];

[queue addOperation:[[TRVSURLSessionOperation alloc] initWithSession:session request:[NSURLRequest requestWithURL:@"https://github.com/travisjeffery"] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { ... }]];

等待所有请求完成

NSOperationQueue *queue = [[NSOperationQueue alloc] init];

NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];

[queue addOperation:[[TRVSURLSessionOperation alloc] initWithSession:session request:[NSURLRequest requestWithURL:@"https://twitter.com/travisjeffery"] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { ... }]];

[queue addOperation:[[TRVSURLSessionOperation alloc] initWithSession:session request:[NSURLRequest requestWithURL:@"https://github.com/travisjeffery"] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { ... }]];

[queue waitUntilAllOperationsAreFinished];

NSLog(@"All requests are done!");