iOS開發——post非同步網路請求封裝
#import #import #import Reachability.h@interface HttpHelper : NSObject+ (BOOL)NetWorkIsOK;//檢查網路是否可用+ (void)post:(NSString *)Url RequestParams:(NSDictionary *)params FinishBlock:(void (^)(NSURLResponse *response, NSData *data, NSError *connectionError)) block;//post請求封裝@end
接下來是實現檔案
// HttpHelper.m#import HttpHelper.h@implementation HttpHelper//這個函數是判斷網路是否可用的函數(wifi或者蜂窩資料可用,都返回YES)+ (BOOL)NetWorkIsOK{ if( ([[Reachability reachabilityForInternetConnection] currentReachabilityStatus] != NotReachable) && ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] != NotReachable) ){ return YES; }else{ return NO; }}//post非同步請求封裝函數+ (void)post:(NSString *)URL RequestParams:(NSDictionary *)params FinishBlock:(void (^)(NSURLResponse *response, NSData *data, NSError *connectionError)) block{ //把傳進來的URL字串轉變為URL地址 NSURL *url = [NSURL URLWithString:URL]; //請求初始化,可以在這針對緩衝,逾時做出一些設定 NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:20]; //解析請求參數,用NSDictionary來存參數,通過自訂的函數parseParams把它解析成一個post格式的字串 NSString *parseParamsResult = [self parseParams:params]; NSData *postData = [parseParamsResult dataUsingEncoding:NSUTF8StringEncoding]; [request setHTTPMethod:@POST]; [request setHTTPBody:postData]; //建立一個新的隊列(開啟新線程) NSOperationQueue *queue = [NSOperationQueue new]; //發送非同步請求,請求完以後返回的資料,通過completionHandler參數來調用 [NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:block];// return result;}//把NSDictionary解析成post格式的NSString字串+ (NSString *)parseParams:(NSDictionary *)params{ NSString *keyValueFormat; NSMutableString *result = [NSMutableString new]; //執行個體化一個key列舉程式用來存放dictionary的key NSEnumerator *keyEnum = [params keyEnumerator]; id key; while (key = [keyEnum nextObject]) { keyValueFormat = [NSString stringWithFormat:@%@=%@&,key,[params valueForKey:key]]; [result appendString:keyValueFormat]; NSLog(@post()方法參數解析結果:%@,result); } return result;}@end
就是這麼簡單。下面用 登入的例子 給大家示範一下是怎麼用的。
- (void)login{ NSString *url = @127.0.0.1/login.php; NSString *userName = @admin; NSString *password = @root; //加入參數 NSMutableDictionary *params = [NSMutableDictionary new]; [params setValue:userName forKey:@phone]; [params setValue:password forKey:@password]; //有網路才發送請求 if([HttpHelper NetWorkIsOK]){ //發送請求,並且得到返回的資料 [HttpHelper post:url RequestParams:params FinishBlock:^(NSURLResponse *response, NSData *data, NSError *connectionError) { //傳回來的資料存在,則執行改回調甘薯 if(data){ //子線程通知主線程更新UI,selector中是要執行的函數,data是傳給這個函數的參數 //login_callBack就處理返回來的訊息,這裡就簡單的輸出,登入成功 [self performSelectorOnMainThread:@selector(login_callBack:) withObject:data waitUntilDone:YES]; }else{ NSLog(@無效的資料); } }]; }}//登入的回呼函數,首先判斷接收的值是不是能登入。若不能,則提示使用者。若能登入,則處理segue來跳轉介面- (void)login_callBack:(id)value{ NSLog(@登入成功);}