网络请求的封装方法

网络请求:

Connection.h文件

#import "Connection.h"@implementation Connection- (instancetype)init{    self = [super init];    if (self) {        self.data = [NSMutableData data];    }    return self;}- (void)dealloc{    [super dealloc];}+ (void)connectionWithUrl:(NSString *)strUrl parmaters:(NSMutableDictionary *)parmaters delegate:(id<ConnectionDelegate>)delegate flag:(NSInteger)flag{    Connection *conn = [[Connection alloc] init];    conn.delegate = delegate;    conn.flag = flag;    [conn startConnectWithUrl:strUrl parmaters:parmaters];    [conn release];}//网络请求的准备阶段:- (void)startConnectWithUrl:(NSString *)strUrl parmaters:(NSMutableDictionary *)parmaters{    //拼接网址    NSString *str = @"";    for (NSString *key in [parmaters allKeys]) {        if ([str length] == 0) {            str = [NSString stringWithFormat:@"?%@=%@",key,[parmaters objectForKey:key]];        }else{            str = [NSString stringWithFormat:@"%@&%@=%@",str,key,[parmaters objectForKey:key]];        }    }    NSString *value = [NSString stringWithFormat:@"%@%@",strUrl,str];    //转换字符串格式为Utf8,防止网址中出现汉字    value = [value stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];            NSURL *url = [NSURL URLWithString:value];    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];        //网络请求的响应方法    [request setHTTPMethod:@"GET"];        //连接网络    [NSURLConnection connectionWithRequest:request delegate:self];    }//接受响应- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{    }//接收数据- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{    [self.data appendData:data];}//响应完成- (void)connectionDidFinishLoading:(NSURLConnection *)connection{    if ([self.delegate respondsToSelector:@selector(sendToData:flag:)]) {        [self.delegate sendToData:self.data flag:self.flag];    }}//如果出现错误显示错误信息-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{    NSLog(@"error = %@",error);}@end

#import <Foundation/Foundation.h>@protocol ConnectionDelegate <NSObject>//传递数据- (void)sendToData:(NSMutableData *)data flag:(NSInteger)flag;@end@interface Connection : NSObject<NSURLConnectionDataDelegate>@property(retain,nonatomic)NSMutableData *data;@property(assign,nonatomic)NSInteger flag;@property(assign,nonatomic)id<ConnectionDelegate>delegate;+ (void)connectionWithUrl:(NSString *)strUrl parmaters:(NSMutableDictionary *)parmaters delegate:(id<ConnectionDelegate>)delegate flag:(NSInteger)flag;- (void)startConnectWithUrl:(NSString *)strUrl parmaters:(NSMutableDictionary *)parmaters;@end

Connection.m文件: