iOS之网络请求的简单封装

#import 
//定义枚举  用来标示请求的类型
typedef NS_ENUM(NSInteger,RequestType) {
    GET,
    POST
};
//网络请求完成的block
typedef void(^RequestFinish)(NSData *data);
//网络请求失败的block
typedef void(^RequestError)(NSError *error);



@interface NetWorkingRequestManager : NSObject

+ (void)requestWithType:(RequestType)type urlString:(NSString*)urlString parDic:(NSDictionary*)parDic finish:(RequestFinish)finish error:(RequestError)error;
@end

#import "NetWorkingRequestManager.h"

@implementation NetWorkingRequestManager

+ (void)requestWithType:(RequestType)type urlString:(NSString *)urlString parDic:(NSDictionary *)parDic finish:(RequestFinish)finish error :(RequestError)error {
    NetWorkingRequestManager *manager = [[NetWorkingRequestManager alloc] init];
    [manager requestWithType:type urlString:urlString parDic:parDic finish:finish error:error];
}

- (void)requestWithType:(RequestType)type urlString:(NSString*)urlString parDic:(NSDictionary*)parDic finish:(RequestFinish)finish error:(RequestError)error {
    //拿到参数之后进行请求
    NSURL *url = [NSURL URLWithString:urlString];
    //创建可变的URLRequest
    NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];
    //如果请求方式是POST需要设置参数和请求方式
    if(type == POST) {
        //设置请求方式
        [urlRequest setHTTPMethod:@"POST"];
        if (parDic.count > 0) {
            NSData *data = [self parDicToDataWithDic:parDic];
            //设置请求参数的Body
            [urlRequest setHTTPBody:data];
        }
    }
    [NSURLConnection sendAsynchronousRequest:urlRequest queue:[NSOperationQueue currentQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
        if (data) {
            finish(data);
        } else {
            error(connectionError);
        }

    }];
}

//把参数字典转为POST请求所需要的参数体
- (NSData *)parDicToDataWithDic:(NSDictionary*)dic {
    NSMutableArray *array = [NSMutableArray array];
    //遍历字典得到的每一个键,得到所有的key = value类型的字符串
    for (NSString *key in dic) {
        NSString *str = [NSString stringWithFormat:@"%@=%@",key,dic[key]];
        [array addObject:str];
    }
    //数组里所有的key=value的字符串通过&符号连接
    NSString *parString = [array componentsJoinedByString:@"&"];
    return [parString dataUsingEncoding:NSUTF8StringEncoding];
}