iOS常用网络请求方法详解

//AFAppDotNetAPIClient.h

#import
#import
@interface AFAppDotNetAPIClient : AFHTTPSessionManager

//创建单例类的方法声明
+ (instancetype)sharedClient;

@end

//AFAppDotNetAPIClient.m

#import "AFAppDotNetAPIClient.h"

@implementation AFAppDotNetAPIClient

//创建单例类的方法实现
+ (instancetype)sharedClient{
//初始化一个静态的类指针
static AFAppDotNetAPIClient *sharedClient;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sharedClient = [AFAppDotNetAPIClient new];

//AFNetworking请求头信息相关设置
sharedClient.requestSerializer = [AFJSONRequestSerializer serializer];
[sharedClient.requestSerializer setValue:@"application/json;charset=utf-8" forHTTPHeaderField:@"Content-Type"];

//AFNetworking获取到的参数相关设置
sharedClient.responseSerializer = [AFJSONResponseSerializer serializer];
sharedClient.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/json", @"text/html", @"text/javascript", nil];
//SSL相关设置
sharedClient.securityPolicy = [AFSecurityPolicy policyWithPinningMode:AFSSLPinningModeNone];
});

return sharedClient;
}
@end

- (NSURLSessionDataTask *)defaultRequestwithURL: (NSString *)URL withParameters: (NSDictionary *)parameters withMethod: (NSString *)method withBlock:(void (^)(NSDictionary *dict, NSError *error))block
{
//默认打印传入的实参
#ifdef DEBUG
NSLog(@"common method = %@", method);//get 或 post
NSLog(@"common URL = %@", URL);//所请求的网址
NSLog(@"common parameters = %@", parameters);//传入的参数
#endif

//根据method字符串判断调用AFNetworking里的get方法还是post方法
if ( [method isEqualToString:@"GET"] ) {//所用到的是AFNetworking3.1.0里的方法，其新加了progress进度block
return [[AFAppDotNetAPIClient sharedClient] GET:URL parameters:parameters progress:^(NSProgress * _Nonnull downloadProgress) {

} success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable JSON) {
#ifdef DEBUG
NSLog(@"common get json = %@", JSON);//打印获取到的json
#endif

NSDictionary *dict = JSON;//直接返回字典，方便使用

if (block) {
block(dict, nil);
}
} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
//如果请求出错返回空字典和NSError指针
if (block) {
block([NSDictionary dictionary], error);//这一点算是比较坑的地方了，因为比如我要根据一个字段来判断是否请求成功，我对一个空字典@{}，
//根据一个key取value：[@{} objectForKey:@"errorCode"]，
//然后判断字符串的intValue是否等于0:[[@{} objectForKey:@"errorCode"] intValue] == 0是返回1的。
//我想的解决办法就是从服务器端来改，返回的字段key用isSuccess，value是字符串True或False即可解决，
//但是这样又只能知道成功或失败并不能根据errorCode码进行其他操作，因为errorCode可以为0、1、2、3等等。
}

//从指针级判断error是否为空，如果不为空就打印error
if (error) {
NSLog(@"%@",error);
}
}];
}

//post相关代码
return [[AFAppDotNetAPIClient sharedClient]POST:URL parameters:parameters progress:^(NSProgress * _Nonnull uploadProgress) {

} success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable JSON) {
#ifdef DEBUG
NSLog(@"common post json = %@", JSON);//打印获取到的json
#endif

NSDictionary *dict = JSON;//直接返回字典，方便使用

if (block) {
block(dict, nil);
}
} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
//如果请求出错返回空字典和NSError指针
if (block) {
block([NSDictionary dictionary], error);
}

//从指针级判断error是否为空，如果不为空就打印error
if (error) {
NSLog(@"%@",error);
}
}];

//返回值暂时用不到，不需要创建变量接收；传进的self指针也没有用到所以这个方法可移植性很强
}

-(void)request
{
//测试网络请求方法
//1.所用到的网址是本人以前抓到的，API是用php写的，服务器很稳定，我常用来测试，也仅供测试
//2.get参数 start和end传无符号整数
NSDictionary *parameters = @{
@"type":@"list",
@"city":@"2",
@"lid":@"31",
@"sortby":@"1",
@"start":@"0",
@"end":@"3"
};

[self defaultRequestwithURL:@"/api.php" withParameters:parameters withMethod:@"GET" withBlock:^(NSDictionary *dict, NSError *error) {

}];
}

-(void)startMultiPartUploadTaskWithURL:(NSString *)url
imagesArray:(NSArray *)images
parameterOfimages:(NSString *)parameter
parametersDict:(NSDictionary *)parameters
compressionRatio:(float)ratio
succeedBlock:(void (^)(NSDictionary *dict))succeedBlock
failedBlock:(void (^)(NSError *error))failedBlock{
if (images.count == 0) {
NSLog(@"图片数组计数为零");
return;
}
for (int i = 0; i if (![images[i] isKindOfClass:[UIImage class]]) {
NSLog(@"images中第%d个元素不是UIImage对象",i+1);
}
}

AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];

[manager POST:url parameters:parameters constructingBodyWithBlock:^(id _Nonnull formData) {
int i = 0;
//根据当前系统时间生成图片名称
NSDate *date = [NSDate date];
NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
[formatter setDateFormat:@"yyyy年MM月dd日"];
NSString *dateString = [formatter stringFromDate:date];

for (UIImage *image in images) {
NSString *fileName = [NSString stringWithFormat:@"%@%d.png",dateString,i];
NSData *imageData;
if (ratio > 0.0f && ratio imageData = UIImageJPEGRepresentation(image, ratio);
}else{
imageData = UIImageJPEGRepresentation(image, 1.0f);
}
[formData appendPartWithFileData:imageData name:parameter fileName:fileName mimeType:@"image/jpg/png/jpeg"];
}
} progress:^(NSProgress * _Nonnull uploadProgress) {

} success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil];

NSLog(@"common post json = %@", dict);

succeedBlock(dict);
} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
if (error) {
failedBlock(error);

NSLog(@"%@",error);
}
}];
}