1.使用代理方式發(fā)送請求的弊端
#import "TESTViewController.h"
#import "DPAPI.h"
@interface TESTViewController () <DPRequestDelegate>
@property (nonatomic,strong) DPAPI *api;
@property (nonatomic,strong) DPRequest *request1;
@property (nonatomic,strong) DPRequest *request2;
@property (nonatomic,strong) DPRequest *request3;
@end
@implementation TESTViewController
- (DPAPI *)api{
if (_api==nil) {
_api = [[DPAPI alloc] init];
}
return _api;
}
- (void)request:(DPRequest *)request didReceiveResponse:(NSURLResponse *)response{
}
- (void)request:(DPRequest *)request didReceiveRawData:(NSData *)data{
}
- (void)request:(DPRequest *)request didFinishLoadingWithResult:(id)result{
//NSLog(@"result = %@",result);
if (request == _request1) {
}
else if (request == _request2){
}
else if (request == _request3){
}
else{
}
}
- (void)request:(DPRequest *)request didFailWithError:(NSError *)error{
//NSLog(@"error = %@",error);
if (request == _request1) {
}
else if (request == _request2){
}
else if (request == _request3){
}
else{
}
}
- (void)viewDidLoad {
[super viewDidLoad];
NSMutableDictionary *dict1 = [NSMutableDictionary dictionary];
dict1[@"city"] = @"北京";
_request1 = [self.api requestWithURL:@"v1/deal/find_deals" params:dict1 delegate:self];
NSMutableDictionary *dict2 = [NSMutableDictionary dictionary];
dict2[@"city"] = @"上海";
_request2 = [self.api requestWithURL:@"v1/deal/find_deals" params:dict2 delegate:self];
NSMutableDictionary *dict3 = [NSMutableDictionary dictionary];
dict3[@"city"] = @"深圳";
_request3 = [self.api requestWithURL:@"v1/deal/find_deals" params:dict3 delegate:self];
}
@end
整個項目到處都在發(fā)送請求 ，需要發(fā)送大量的請求，需要對發(fā)送請求進行封裝
2.給DPRequest添加2個block屬性,封裝block形式的接口
點評接口是整個項目到處都需要使用的，團購展示頁面、團購詳情頁面…都需要使用SDK的接口，整個項目都需要發(fā)送請求、所以發(fā)送請求的代碼不能封裝在控制器中，要封裝到工具類
就不叫httpTool了，因為我們不管大眾點評的API發(fā)送的是什么請求
我調用大眾點評的東西，它里面發(fā)什么請求我不知道
工具類你去發(fā)一個請求，請求地址 和 參數(shù) 告訴你,請求成功了告訴我 ，請求失敗了告訴我
Request參數(shù) 和 params參數(shù)是傳給接口的
Json和error參數(shù)是接口傳出來的
1-DPRequestDelegate.png
協(xié)議方法都是對象方法,說明對象才能作為代理
以前寫工具類使用類方法,這次特殊因為工具類要實現(xiàn)<DPRequestDelegate>協(xié)議所以要用到工具類的對象,所以該接口設計為對象方法
別人拿到我的ZYXAPITool ，給我請求urlString 和 參數(shù) paramsDict ,success block和 failure block
ZYXAPITool拿到DPAPI對象，發(fā)送請求，請求成功或失敗調用ZYXAPITool對象實現(xiàn)的<DPRequestDelegate>協(xié)議中的代理方法
但是DPAPI對象只需要創(chuàng)建一次，在ZYXAPITool使用一個strong引用它即可
2-DPRequestDelegate請求成功和失敗的代理方法.png
請求成功和失敗的兩個代理方法
是拿不到接口傳入的success() 和 failure() 這兩個block 參數(shù)的
并且如果連續(xù)調用4次該ZYXAPITool接口方法，會有4個success 和 4個failure block參數(shù)
ZYXAPITool設計的接口方法和兩個DPRequestDelegate代理方法的橋梁？
3-橋梁就是DPRequest對象.png
可以把success 和 failure 兩個參數(shù)block 塞給
4-dpapi接口方法返回的DPRequest對象.png
然后把 DPRequest *request對象 傳給 DPRequestDelegate協(xié)議的兩個代理方法
5-DPRequest增加2個block類型的成員變量.png
DPRequest.h
#warning 增加2個請求的block
@property (nonatomic, copy) void (^success)(id jsonObj);
@property (nonatomic, copy) void (^failure)(NSError *error);
ZYXAPITool.h
#import <Foundation/Foundation.h>
@interface ZYXAPITool : NSObject
- (void)request:(NSString *)urlString
params:(NSDictionary *)paramsDict
success:(void (^)(id jsonObj))success
failure:(void (^)(NSError *error))failure;
@end
ZYXAPITool.m
#import "ZYXAPITool.h"
#import "DPAPI.h"
@interface ZYXAPITool() <DPRequestDelegate>
@property (nonatomic, strong) DPAPI *api;
@end
@implementation ZYXAPITool
- (DPAPI *)api{
if (_api == nil) {
self.api = [[DPAPI alloc] init];
}
return _api;
}
- (void)request:(NSString *)urlString
params:(NSDictionary *)paramsDict
success:(void (^)(id jsonObj))success
failure:(void (^)(NSError *))failure{
DPRequest *request = [self.api requestWithURL:urlString
params:[NSMutableDictionary dictionaryWithDictionary:paramsDict]
delegate:self];
request.success = success;
request.failure = failure;
}
#pragma mark - DPRequestDelegate
- (void)request:(DPRequest *)request didFinishLoadingWithResult:(id)result{
if (request.success) {
request.success(result);
}
}
- (void)request:(DPRequest *)request didFailWithError:(NSError *)error{
if (request.failure) {
request.failure(error);
}
}
@end
因為ZYXAPITool要實現(xiàn)<DPRequestDelegate>協(xié)議所以設計為對象接口
使用ZYXAPITool發(fā)送請求，DPAPI返回一個DPRequest對象，通過返回的DPRequest對象把傳入的success 和 failure 兩個block參數(shù) 存起來
請求大眾點評的服務器成功 把傳入的success調用一下
失敗同理
block類型的成員使用copy關鍵字
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
dict[@"city"] = @"北京";
ZYXAPITool *apiTool = [[ZYXAPITool alloc] init];
[apiTool request:@"v1/deal/find_deals"
params:dict
success:^(id jsonObj) {
NSLog(@"success jsonObj = %@",jsonObj);
}
failure:^(NSError *error) {
NSLog(@"failure error = %@",error);
}];
2016-08-25 19:20:30.124 大眾點評API[60093:2307979] success jsonObj = {
count = 20;
deals = (
{
businesses = (
{
city = "\U5317\U4eac";
"h5_url" = "http://m.dianping.com/shop/65685091?utm_source=open";
id = 65685091;
latitude = "39.89661";
longitude = "116.41923";
name = "\U6469\U6839\U5927\U53e4\U7535\U73a9\U57ce";
url = "http://www.dianping.com/shop/65685091?utm_source=open";
}
);
categories = (
"\U684c\U6e38/\U7535\U73a9/\U7f51\U5427"
);
city = "\U5317\U4eac";
"commission_ratio" = 0;
"current_price" = 40;
"deal_h5_url" = "http://m.dianping.com/tuan/deal/20401897?utm_source=open";
"deal_id" = "2-20401897";
"deal_url" = "http://t.dianping.com/deal/20401897?utm_source=open";
description = "\U6469\U6839\U5927\U53e4\U7535\U73a9\U57ce \U4ec5\U552e40\U5143\Uff0c\U4ef7\U503c50\U5143\U6e38\U620f\U5e0150\U4e2a\Uff01";
distance = "-1";
"image_url" = "http://i1.s2.dpfile.com/pc/mc/625e128afdd3b62caf71fc228d22c2c8(640c400)/thumb.jpg";
"list_price" = 50;
"publish_date" = "2016-06-24";
"purchase_count" = 412;
"purchase_deadline" = "2017-06-30";
regions = (
"\U4e1c\U57ce\U533a"
);
"s_image_url" = "http://i1.s2.dpfile.com/pc/mc/625e128afdd3b62caf71fc228d22c2c8(160c100)/thumb.jpg";
title = "\U6469\U6839\U5927\U53e4\U7535\U73a9\U57ce";
},
其余的19組數(shù)據(jù)
);
status = OK;
"total_count" = 114644;
}
3.ZYXAPITool的單例設計模式
控制器需要發(fā)送請求，都需要實例化 ZYXAPITool 沒必要全局創(chuàng)建多個全局擁有一個api對象，就可以發(fā)送所有的請求了
ZYXSingleton.h
// .h文件
#define ZYXSingletonH(name) + (instancetype)shared##name;
// .m文件
#define ZYXSingletonM(name) \
static id _instance = nil; \
+ (id)allocWithZone:(struct _NSZone *)zone \
{ \
static dispatch_once_t onceToken; \
dispatch_once(&onceToken, ^{ \
_instance = [super allocWithZone:zone]; \
}); \
return _instance; \
} \
+ (instancetype)shared##name \
{ \
static dispatch_once_t onceToken; \
dispatch_once(&onceToken, ^{ \
_instance = [[self alloc] init]; \
}); \
return _instance; \
} \
- (id)copyWithZone:(NSZone *)zone \
{ \
return _instance; \
}
ZYXAPITool.h
#import <Foundation/Foundation.h>
#import "ZYXSingleton.h"
@interface ZYXAPITool : NSObject
- (void)request:(NSString *)urlString
params:(NSDictionary *)paramsDict
success:(void (^)(id jsonObj))success
failure:(void (^)(NSError *error))failure;
ZYXSingletonH(APITool)
@end
ZYXAPITool.m
#import "ZYXAPITool.h"
#import "DPAPI.h"
@interface ZYXAPITool() <DPRequestDelegate>
@property (nonatomic, strong) DPAPI *api;
@end
@implementation ZYXAPITool
ZYXSingletonM(APITool)
- (DPAPI *)api{
if (_api == nil) {
self.api = [[DPAPI alloc] init];
}
return _api;
}
- (void)request:(NSString *)urlString
params:(NSDictionary *)paramsDict
success:(void (^)(id jsonObj))success
failure:(void (^)(NSError *))failure{
DPRequest *request = [self.api requestWithURL:urlString
params:[NSMutableDictionary dictionaryWithDictionary:paramsDict]
delegate:self];
request.success = success;
request.failure = failure;
}
#pragma mark - DPRequestDelegate
- (void)request:(DPRequest *)request didFinishLoadingWithResult:(id)result{
if (request.success) {
request.success(result);
}
}
- (void)request:(DPRequest *)request didFailWithError:(NSError *)error{
if (request.failure) {
request.failure(error);
}
}
@end
4.網(wǎng)絡工具類 和 具體業(yè)務類 理解
6-項目分層.png
7-ZYXAPITool返回jsonObj字典.png
因為ZYXAPITool是一個通用的工具類，肯定是返回字典對象，任何人都可以使用它發(fā)請求，請求成功返回的是jsonObj字典對象，不是模型對象；
如果ZYXAPITool返回模型對象就不是通用的了，發(fā)任何請求都返回一個特定的模型對象，那么這個工具類就只能做一件事情了，作為APITool是應該能發(fā)任何請求的，所以返回什么APITool不用管，你把jsonObj字典對象返回給我就好了
業(yè)務層才是具體的，要返回模型對象，把APITool返回的jsonObj字典對象解析成模型對象
作為通用的工具類應該用通用的數(shù)據(jù)類型，參數(shù)是字典對象 返回值也是字典對象
