使用ASIHTTPRequest 网络连接

#import <UIKit/UIKit.h>
#import "ASIHTTPRequest.h"
@interface WebImageView : UIImageView <ASIHTTPRequestDelegate>

- (void)setImageURL:(NSURL *)url;
@end

#import "WebImageView.h"
#import "ASIHTTPRequest.h"
#import "ASIFormDataRequest.h"
@implementation WebImageView

- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
}
return self;
}

- (void)setImageURL:(NSURL *)url
{
//同步请求
//[self synchronous:url];
//异步
//    [self aSynchronous:url];
[self aSynchronousBlock:url];
}

//同步请求
- (void)synchronous:(NSURL *)url
{
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setRequestMethod:@"GET"];
[request setTimeOutSeconds:60];

//设置请求头
//request setRequestHeaders:(NSMutableDictionary *)

//发送同步请求
[request startSynchronous];
NSError *error = request.error;
if (error != nil){
NSLog(@"error :%@", error);
}else{
NSData *data = [request responseData];
self.image = [UIImage imageWithData:data];
}
}
//异步
- (void)aSynchronous:(NSURL *)url
{
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setRequestMethod:@"GET"];
[request setTimeOutSeconds:60];
//发送同步请求
request.delegate = self;
[request startAsynchronous];
}

//使用block， 不用设置代理
- (void)aSynchronousBlock:(NSURL *)url
{
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setRequestMethod:@"GET"];
[request setTimeOutSeconds:60];
//网络请求结束调用
[request setCompletionBlock:^{
NSData *data = [request responseData];
self.image = [UIImage imageWithData:data];
}];

[request setFailedBlock:^{
NSLog(@"error: %@", request.error);
}];
//发送异步请求
[request startAsynchronous];
}

//post 请求参数 网络请求 ASIFormDataRequest
- (void)aSynchronousPost:(NSURL *)url
{
ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
[request setRequestMethod:@"POST"];
[request setTimeOutSeconds:60];
//设置请求参数
//username=gkgk&pwd=3333
//[request addPostValue:@"" forKey:@""]//比如用户名和密码等。

//网络请求结束调用
[request setCompletionBlock:^{
NSData *data = [request responseData];
self.image = [UIImage imageWithData:data];
}];

[request setFailedBlock:^{
NSLog(@"error: %@", request.error);
}];
//发送异步请求
[request startAsynchronous];
}

#pragma mark ASIHttpRequest delegate
- (void)requestFinished:(ASIHTTPRequest *)request
{
NSData *data = [request responseData];
self.image = [UIImage imageWithData:data];
}

- (void)requestFailed:(ASIHTTPRequest *)request
{
NSLog(@"error :%@", request.error);
}

@end

缓存

//使用block， 不用设置代理
- (void)aSynchronousBlock:(NSURL *)url
{
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setRequestMethod:@"GET"];
[request setTimeOutSeconds:60];
//网络请求结束调用
[request setCompletionBlock:^{
NSData *data = [request responseData];
self.image = [UIImage imageWithData:data];
}];

// 使用缓存策略
//缓存位置
NSString *cachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
ASIDownloadCache *cache = [[ASIDownloadCache alloc]init];
[cache setStoragePath:cachePath];
//缓存策略
cache.defaultCachePolicy = ASIOnlyLoadIfNotCachedCachePolicy;

//每次启动，清除上次缓存文件
request.cacheStoragePolicy = ASICacheForSessionDurationCacheStoragePolicy;
//缓存对象
request.downloadCache = cache;

[request setFailedBlock:^{
NSLog(@"error: %@", request.error);
}];
//发送异步请求
[request startAsynchronous];
}

判断数据来自缓存，还是网络
//使用block， 不用设置代理
- (void)aSynchronousBlock:(NSURL *)url
{
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setRequestMethod:@"GET"];
[request setTimeOutSeconds:60];
//网络请求结束调用
[request setCompletionBlock:^{
NSData *data = [request responseData];
self.image = [UIImage imageWithData:data];
//判断数据来自网路，还是缓存
if (request.didUseCachedResponse){
NSLog(@"数据来自缓存");
}else{
NSLog(@"数据来自网络");
}
}];

// 使用缓存策略
//缓存位置
NSString *cachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
ASIDownloadCache *cache = [[ASIDownloadCache alloc]init];
[cache setStoragePath:cachePath];
//缓存策略
cache.defaultCachePolicy = ASIOnlyLoadIfNotCachedCachePolicy;

//每次启动，清除上次缓存文件
request.cacheStoragePolicy = ASICacheForSessionDurationCacheStoragePolicy;
//缓存对象
request.downloadCache = cache;

[request setFailedBlock:^{
NSLog(@"error: %@", request.error);
}];
//发送异步请求
[request startAsynchronous];
}

需要添加ASIHTtpRequestSample开源文件以及

libz.dylib

libxml2.dylib

moblieCoreServices.framework

systemConfigration.framework

CFNetwork.framework

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