下面是我做同样的事情了我自己的应用程序之一的方式:
* 注:这将运行一个GET请求,不POST请求,但它确实是在后台和高效运行
创建类从服务器上执行的数据检索(I称为矿online.h /米)
AppDelegate.h
//
// AppDelegate.h
// Faith Life Fellowship Streamer
//
// Created by David Worth on 7/17/11.
// Copyright 2011 Math Nerd Productions, LLC. All rights reserved.
//
#import <UIKit/UIKit.h>
@class ViewController;
@interface AppDelegate : NSObject <UIApplicationDelegate> {
NSOperationQueue *queue;
}
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet ViewController *viewController;
@property (nonatomic, retain) NSString *receivedURL;
- (void)stringLoad:(NSString*)str;
+ (id)shared;
- (void)addOperation:(NSOperation*)operation;
@end
这些作品添加到 AppDelegate.m
@synthesize receivedURL;
static AppDelegate *shared;
+ (id)shared;
{
if (!shared) {
[[AppDelegate alloc] init];
}
return shared;
}
- (id)init
{
if (shared) {
[self autorelease];
return shared;
}
if (![super init]) return nil;
queue = [[NSOperationQueue alloc] init];
shared = self;
return self;
}
- (void)addOperation:(NSOperation *)operation
{
[queue addOperation:operation];
}
- (void)stringLoad:(NSString *)str
{
self.receivedURL = str;
[[NSNotificationCenter defaultCenter] postNotificationName:@"string" object:nil];
}
online.h
//
// online.h
// FLF Streamer
//
// Created by David Worth on 4/30/12.
// Copyright (c) 2012 Math Nerd Productions, LLC. All rights reserved.
//
#import <Foundation/Foundation.h>
#import "AppDelegate.h"
@interface online : NSOperation
@property (nonatomic, retain) NSString* str;
@property (nonatomic) int type;
- (id)initWithString:(NSString*)url;
@end
online.m
//
// online.m
// FLF Streamer
//
// Created by David Worth on 4/30/12.
// Copyright (c) 2012 Math Nerd Productions, LLC. All rights reserved.
//
#import "online.h"
@implementation online
@synthesize str;
- (id)initWithString:(NSString *)url
{
if (![super init]) return nil;
[self setStr:url];
return self;
}
- (void)dealloc {
[str release], str = nil;
[super dealloc];
}
- (void)main {
NSString *webpageString = [[[NSString alloc] initWithContentsOfURL:[NSURL URLWithString:str] encoding:NSUTF8StringEncoding error:nil] autorelease];
[[AppDelegate shared] performSelectorOnMainThread:@selector(stringLoad:)
withObject:webpageString
waitUntilDone:YES];
}
@end
然后在你的viewco ntroller.m,调用它(与PHP页面要访问的URL替换mysite.com ...):
online* o = [[online alloc] initWithString:@"http://www.mysite.com/myphppage.php?variable1=blah+blah+blah"];
AppDelegate* delegate = [AppDelegate shared];
[delegate addOperation:o];
而在你viewcontroller.m viewDidLoad方法:
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(myMethodToProcessWhatTheServerReturns) name:@"string" object:nil];
然后使该方法在viewController.m是什么解析服务器返回:
- (void)myMethodToProcessWhatTheServerReturns
{
NSString* serverResponse = [AppDelegate shared].receivedURL;
//Do stuff with serverResponse
}
编码快乐!
你有一些似乎合理的代码...为什么不尝试并调整它。或者至少告诉我们什么是行不通的。还要看看NSURLConnections类的方法“sendAsynchronousRequest ...”,它将一个块作为完成处理程序,并绕过“繁琐”的委托调用来处理您可能不需要的细致的响应。 – Mario