废话不多说，直奔主题
NSURLSession GET 使用block 请求
//请求地址，此处是图片的url，具体使用可以换成对应的url
NSURL *url=[NSURL URLWithString:@"https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1490091074375&di=03327b9db0e521fd5a60c0a1475b76ae&imgtype=0&src=http%3A%2F%2Fimg.pconline.com.cn%2Fimages%2Fupload%2Fupc%2Ftx%2Fladyproduct%2F1412%2F03%2Fc0%2F186933_1417582957252.jpg"];
NSURLSession *session=[NSURLSession sharedSession];
NSURLSessionDataTask * task = [session dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
//data就是返回的数据。可以进行json等处理
//此处是图片，所以我把图片写入本地
NSString *path = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"get.jpg"];
[data writeToFile:path atomically:YES];
}];
[task resume];
NSURLSession GET 使用delegate 请求 实现 NSURLSessionDataDelegate 代理方法
- (void)NSURLSessionDataTaskdelegate {
NSURLSessionConfiguration *configuration=[NSURLSessionConfiguration defaultSessionConfiguration];
configuration.timeoutIntervalForRequest = 10;
//在蜂窝网络情况下是否继续请求（上传或下载）
configuration.allowsCellularAccess = NO;
//它会把WiFi和电源可用性考虑在内,建议使用这个，不适用上面的
configuration.discretionary = YES;
NSURLSession *session=[NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:[NSOperationQueue mainQueue]];
NSURL *url=[NSURL URLWithString:@"https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1490091307121&di=d9395ca6a2e11cdaa4c6a7d191a7eb43&imgtype=0&src=http%3A%2F%2Fi1.sinaimg.cn%2Fgm%2F2012%2F0529%2FU7233P115DT20120529105050.jpg"];
NSURLSessionDataTask *task = [session dataTaskWithURL:url];
[task resume];
}
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask
didReceiveResponse:(NSURLResponse *)response
completionHandler:(void (^)(NSURLSessionResponseDisposition disposition))completionHandler {
//接收响应的时候需要对返回的参数进行处理
NSLog(@"%s",__func__);
//获取总数据长度
NSLog(@"expectedContentLength %lld",response.expectedContentLength);
// 允许处理服务器的响应，才会继续接收服务器返回的数据
completionHandler(NSURLSessionResponseAllow);
}
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask
didReceiveData:(NSData *)data {
NSLog(@"didReceiveData %lu",(unsigned long)data.length);
//在此可以根据上面获得的数据总长度判断是否获取数据完毕，再做其他处理
}
NSURLSession POST 使用block 请求
NSURL *url=[NSURL URLWithString:@"url"];
NSURLSession *session=[NSURLSession sharedSession];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
request.HTTPMethod = @"POST";
request.HTTPBody = [@"username=userName&password=123456" dataUsingEncoding:NSUTF8StringEncoding];
NSURLSessionTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
}];
[task resume];
NSURLSession 下载 block
NSURL *url=[NSURL URLWithString:@"https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1490091074375&di=03327b9db0e521fd5a60c0a1475b76ae&imgtype=0&src=http%3A%2F%2Fimg.pconline.com.cn%2Fimages%2Fupload%2Fupc%2Ftx%2Fladyproduct%2F1412%2F03%2Fc0%2F186933_1417582957252.jpg"];
NSURLSession *session=[NSURLSession sharedSession];
NSURLSessionDownloadTask *downloadTask = [session downloadTaskWithURL:url completionHandler:^(NSURL * _Nullable location, NSURLResponse * _Nullable response, NSError * _Nullable error) {
// location是沙盒中tmp文件夹下的一个临时url,所以我们需要自己需要把下载的文件移动的需要的地方
NSString *path = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"110.jpg"];
// 移动文件
[[NSFileManager defaultManager] moveItemAtURL:location toURL:[NSURL fileURLWithPath:path] error:nil];
NSLog(@"path %@",path);
}];
[downloadTask resume];
NSURLSession 下载 delegate NSURLSessionDownloadDelegate NSURLSessionTaskDelegate
- (void)SessionDownloadTaskURLdelegate {
NSURLSession *session=[NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]];
NSURL *url=[NSURL URLWithString:@"https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1490091278356&di=44fd6438700a8775d61280d623baa2cf&imgtype=0&src=http%3A%2F%2Fwww.71lady.net%2Fd%2Ffile%2Fyule%2Frihanyule%2Fbagua%2F2015-11-25%2F8d5b965d8f86af711f4ab28b0618c35f.jpg"];
NSURLSessionDownloadTask *task = [session downloadTaskWithURL:url];
[task resume];
/*
断点下载实现方法简述
*/
__block NSData *_resumeData = nil; //需将此数据保存到本地
//暂停/取消方法，返回resumeData数据，进行保存，继续下载调用下面的两个任何一个方法，传入保存的resumeData数据，将会自动进行断点下载
[task cancelByProducingResumeData:^(NSData * _Nullable resumeData) {
_resumeData = resumeData;
}];
//继续下载的两个方法
NSURLSessionDownloadTask *task1=[session downloadTaskWithResumeData:_resumeData completionHandler:^(NSURL * _Nullable location, NSURLResponse * _Nullable response, NSError * _Nullable error) {
}];
[task1 resume];
//将会调用代理中的 - (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didResumeAtOffset:(int64_t)fileOffset expectedTotalBytes:(int64_t)expectedTotalBytes; 方法
NSURLSessionDownloadTask * task2=[session downloadTaskWithResumeData:_resumeData];
[task2 resume];
}
// 下载完成调用
- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask
didFinishDownloadingToURL:(NSURL *)location {
// location还是一个临时路径,需要自己挪到需要的路径(此处是caches下面，看要求更改)
NSString *filePath = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"123.jpg"];
[[NSFileManager defaultManager] moveItemAtURL:location toURL:[NSURL fileURLWithPath:filePath] error:nil];
}
// 获取 下载进度
- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask
didWriteData:(int64_t)bytesWritten
totalBytesWritten:(int64_t)totalBytesWritten
totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite {
CGFloat progress = 1.0 * totalBytesWritten / totalBytesExpectedToWrite;
NSLog(@"%f",progress);
}
//重新下载任务由调用
- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask
didResumeAtOffset:(int64_t)fileOffset
expectedTotalBytes:(int64_t)expectedTotalBytes {
}
//NSURLSessionTaskDelegate 下的一个方法
// 由于下载失败导致的下载中断会进入此协议方法,也可以得到用来恢复的数据
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task
didCompleteWithError:(nullable NSError *)error {
//保存 error.userInfo[NSURLSessionDownloadTaskResumeData] ，下次可以进行断点下载
}
