NSURLSession的POST请求及封装

这是在.h文件中的声明，需要声明两个block用来回调

#import <Foundation/Foundation.h>

typedef void(^SuccessBlock)(id newData, NSURLResponse * response);
typedef void(^FailureBlock)(NSError * error);

@interface NetworkForSession : NSObject
+(void)sessionPostRequsetWithUrl:(NSString *)url Parameters:(NSDictionary *)parameters ResponseBlockWithSuccess:(SuccessBlock)success AndFailureBlock:(FailureBlock)failure;
@end

#import "NetworkForSession.h"

@implementation NetworkForSession
+(void)sessionPostRequsetWithUrl:(NSString *)url Parameters:(NSDictionary *)parameters ResponseBlockWithSuccess:(SuccessBlock)success AndFailureBlock:(FailureBlock)failure{
//异步post

NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]];

//设置请求方式
[request setHTTPMethod:@"POST"];

//设置超时
[request setTimeoutInterval:30.0f];

//(3)设置请求头
//[request setAllHTTPHeaderFields:nil];

//设置请求体
if (parameters != nil) {
NSArray * keyArray = [parameters allKeys];
NSMutableArray * newParameterArray = [NSMutableArray array];
for (int i = 0; i < keyArray.count; i++) {

NSString * str = [[keyArray[i] stringByAppendingString:@"="] stringByAppendingString:[parameters[keyArray[i]] isKindOfClass:[NSString class]] ? parameters[keyArray[i]] : [NSString stringWithFormat:@"%@", parameters[keyArray[i]]]];
[newParameterArray addObject:str];
}

NSMutableString * httpBody = [NSMutableString string];

for (int i = 0; i < newParameterArray.count; i++) {
[httpBody appendString:[newParameterArray[i] stringByAppendingString:@"&"]];
}
[httpBody deleteCharactersInRange:NSMakeRange(httpBody.length - 1, 1)];
[request setHTTPBody:[httpBody dataUsingEncoding:NSUTF8StringEncoding]];
}else{
[request setHTTPBody:nil];
}

//构造session
NSURLSession * session = [NSURLSession sharedSession];
NSURLSessionDataTask * task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {

id newData = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
if (error) {
failure(error);
}else{
success(newData, response);
}
}];
[task resume];
}
@end