**@Block传值** **.h** ~~~ #import <Foundation/Foundation.h> typedef void(^MyBlock)(NSData *); typedef void(^LengthBlock)(float); @interface HMTMyCustomNetRequest : NSObject<NSURLConnectionDataDelegate> @property (nonatomic,retain)NSMutableData * data; @property (nonatomic,retain)NSURLConnection * connection; @property (nonatomic,copy)MyBlock finishLoadBlock; @property (nonatomic,copy)LengthBlock lengthBlock; // GET请求方式 - (void)requestForGETWithUrl:(NSString *)urlString; // POST请求方式 - (void)requestForPOSTWithUrl:(NSString *)urlString postData:(NSData *)data; // 取消请求 - (void)cancelNSURLConnection; @end ~~~ **.m** ~~~ #import "HMTMyCustomNetRequest.h" @interface HMTMyCustomNetRequest (){ NSUInteger leng; } @end @implementation HMTMyCustomNetRequest - (void)dealloc{ RELEASE_SAFELY(_data); RELEASE_SAFELY(_connection); Block_release(_finishLoadBlock); Block_release(_lengthBlock); [super dealloc]; } - (void)requestForGETWithUrl:(NSString *)urlString{ NSURL * url = [NSURL URLWithString:urlString]; NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; [request setHTTPMethod:@"GET"]; /** * Special Considerations During the download the connection maintains a strong reference to the delegate. It releases that strong reference when the connection finishes loading, fails, or is canceled. */ self.connection = [NSURLConnection connectionWithRequest:request delegate:self]; } - (void)requestForPOSTWithUrl:(NSString *)urlString postData:(NSData *)data{ NSURL * url = [NSURL URLWithString:urlString]; NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; [request setHTTPMethod:@"POST"]; [request setHTTPBody:data]; self.connection = [NSURLConnection connectionWithRequest:request delegate:self]; } #pragma mark - 取消协议异步方法调用(关键关键很关键,不做这一步经常出现崩溃的地方) - (void)cancelNSURLConnection{ /** * 如果数据在加载,但是因为其他一些原因,比如跳转页面做其他事,而不是正常的数据加载完成或者数据加载失败 * 一定要手动取消网络请求连接 * Special Considerations * During the download the connection maintains a strong reference to the delegate. It releases that strong reference when the-- * ---connection finishes loading, fails, or is canceled. * self.connection = [NSURLConnection connectionWithRequest:self delegate:self]; * */ [_connection cancel]; self.connection = nil; } #pragma mark - 服务器开始给客户端回传数据,这个方法只会执行一次 - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{ // 初始化接收数据的空data self.data = [NSMutableData data]; // 取得数据总长度 leng = response.expectedContentLength; } #pragma mark - 客户端持续接收数据,data是数据片段,整个数据分段返回,这个方法执行的次数取决于数据总长度[response expectedContentLength] - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{ [self.data appendData:data]; float progressLength = [self.data length] / (float)leng; if (_lengthBlock) { self.lengthBlock(progressLength); } //if (_finishLoadBlock) { //self.finishLoadBlock(_data); //} } #pragma mark - 数据完全下载成功,接收到完整数据 - (void)connectionDidFinishLoading:(NSURLConnection *)connection{ // 调用完整数据的block方法 if (_finishLoadBlock) { self.finishLoadBlock(_data); } } #pragma mark - 数据下载失败 - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{ NSLog(@"请求网络出错:%@",error); } @end ~~~ **@delegate代理传值** **.h** ~~~ #import <Foundation/Foundation.h> @class HMTNetWorkRequest; @protocol NetWorkRequestDelegate<NSObject> @optional //netWork请求成功 - (void)netWorkRequest:(HMTNetWorkRequest *)request didSuccessfulReceiveData:(NSData *)data; //netWork请求失败 - (void)netWorkRequest:(HMTNetWorkRequest *)request didFailed:(NSError *)error; //获取netWork的下载进度 - (void)netWorkRequest:(HMTNetWorkRequest *)request withProgress:(CGFloat)progress; @end @interface HMTNetWorkRequest : NSObject<NSURLConnectionDataDelegate> @property (nonatomic,assign) id<NetWorkRequestDelegate> delegate; @property (nonatomic,retain)NSURLConnection * connection; - (void)requestForGETWithUrl:(NSString *)urlString; - (void)requestForPOSTWithUrl:(NSString *)urlString postData:(NSData *)data; // 取消网络请求 - (void)cancelRequest; @end ~~~ **.m** ~~~ #import "HMTNetWorkRequest.h" @interface HMTNetWorkRequest (){ NSUInteger _totalLength; } @property (nonatomic,retain)NSMutableData * receiveData; @end @implementation HMTNetWorkRequest - (void)dealloc{ RELEASE_SAFELY(_connection); RELEASE_SAFELY(_receiveData); [super dealloc]; } #pragma mark - 不用的时候一定要取消 - (void)cancelRequest{ [_connection cancel]; self.connection = nil; self.delegate = nil; } - (void)requestForGETWithUrl:(NSString *)urlString{ NSURL * url = [NSURL URLWithString:urlString]; NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; [request setHTTPMethod:@"GET"]; /** * Special Considerations During the download the connection maintains a strong reference to the delegate. It releases that strong reference when the connection finishes loading, fails, or is canceled. */ [NSURLConnection connectionWithRequest:request delegate:self]; [request release]; } - (void)requestForPOSTWithUrl:(NSString *)urlString postData:(NSData *)data{ NSURL * url = [NSURL URLWithString:urlString]; NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; [request setHTTPMethod:@"POST"]; [request setHTTPBody:data]; [NSURLConnection connectionWithRequest:request delegate:self]; [request release]; } #pragma mark - 服务器开始给客户端回传数据,这个方法只会执行一次 - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{ // 服务器开始回传数据,客户端需要创建一个空的,可变的Data对象,用于存储每次获取的数据片段 self.receiveData = [NSMutableData data]; // 取得请求数据的长度 _totalLength = [response expectedContentLength]; } #pragma mark - 客户端持续接收数据,data是数据片段,整个数据分段返回,这个方法执行的次数取决于数据总长度[response expectedContentLength] - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{ [self.receiveData appendData:data]; CGFloat progress = [_receiveData length]/_totalLength; if ([_delegate respondsToSelector:@selector(netWorkRequest:withProgress:)]) { [_delegate netWorkRequest:self withProgress:progress]; } } #pragma mark - 数据完全下载成功,接收到完整数据 - (void)connectionDidFinishLoading:(NSURLConnection *)connection{ if ([_delegate respondsToSelector:@selector(netWorkRequest:didSuccessfulReceiveData:)]) { [_delegate netWorkRequest:self didSuccessfulReceiveData:_receiveData]; } self.receiveData = nil; } #pragma mark - 数据下载失败 - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{ NSLog(@"didFailWithError"); } @end ~~~