使用ASIHTTPRequest 網絡連接

#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
{
    //同步請求
    //[self synchronous:url];
    //異步
//    [self aSynchronous:url];
    [self aSynchronousBlock:url];
}

//同步請求
- (void)synchronous:(NSURL *)url
{
    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
    [request setRequestMethod:@"GET"];
    [request setTimeOutSeconds:60];
    
    //設置請求頭
    //request setRequestHeaders:(NSMutableDictionary *)
    
    //發送同步請求
    [request startSynchronous];
    NSError *error = request.error;
    if (error != nil){
        NSLog(@"error :%@", error);
    }else{
        NSData *data = [request responseData];
        self.image = [UIImage imageWithData:data];
    }
}
//異步
- (void)aSynchronous:(NSURL *)url
{
    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
    [request setRequestMethod:@"GET"];
    [request setTimeOutSeconds:60];
    //發送同步請求
    request.delegate = self;
    [request startAsynchronous];
}

//使用block， 不用設置代理
- (void)aSynchronousBlock:(NSURL *)url
{
    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
    [request setRequestMethod:@"GET"];
    [request setTimeOutSeconds:60];
    //網絡請求結束調用
    [request setCompletionBlock:^{
        NSData *data = [request responseData];
        self.image = [UIImage imageWithData:data];
    }];
    
    [request setFailedBlock:^{
        NSLog(@"error: %@", request.error);
    }];
    //發送異步請求
    [request startAsynchronous];
}

//post 請求參數 網絡請求 ASIFormDataRequest
- (void)aSynchronousPost:(NSURL *)url
{
    ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
    [request setRequestMethod:@"POST"];
    [request setTimeOutSeconds:60];
    //設置請求參數
    //username=gkgk&pwd=3333
    //[request addPostValue:@"" forKey:@""]//比如用戶名和密碼等。
    
    //網絡請求結束調用
    [request setCompletionBlock:^{
        NSData *data = [request responseData];
        self.image = [UIImage imageWithData:data];
    }];
    
    [request setFailedBlock:^{
        NSLog(@"error: %@", request.error);
    }];
    //發送異步請求
    [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

緩存

//使用block， 不用設置代理
- (void)aSynchronousBlock:(NSURL *)url
{
    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
    [request setRequestMethod:@"GET"];
    [request setTimeOutSeconds:60];
    //網絡請求結束調用
    [request setCompletionBlock:^{
        NSData *data = [request responseData];
        self.image = [UIImage imageWithData:data];
    }];
    
    // 使用緩存策略
    //緩存位置
    NSString *cachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
    ASIDownloadCache *cache = [[ASIDownloadCache alloc]init];
    [cache setStoragePath:cachePath];
    //緩存策略
    cache.defaultCachePolicy = ASIOnlyLoadIfNotCachedCachePolicy;
    
    //每次啓動，清除上次緩存文件
    request.cacheStoragePolicy = ASICacheForSessionDurationCacheStoragePolicy;
    //緩存對象
    request.downloadCache = cache;
    
    [request setFailedBlock:^{
        NSLog(@"error: %@", request.error);
    }];
    //發送異步請求
    [request startAsynchronous];
}

判斷數據來自緩存，還是網絡

//使用block， 不用設置代理
- (void)aSynchronousBlock:(NSURL *)url
{
    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
    [request setRequestMethod:@"GET"];
    [request setTimeOutSeconds:60];
    //網絡請求結束調用
    [request setCompletionBlock:^{
        NSData *data = [request responseData];
        self.image = [UIImage imageWithData:data];
        //判斷數據來自網路，還是緩存
        if (request.didUseCachedResponse){
            NSLog(@"數據來自緩存");
        }else{
            NSLog(@"數據來自網絡");
        }
    }];
    
    // 使用緩存策略
    //緩存位置
    NSString *cachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
    ASIDownloadCache *cache = [[ASIDownloadCache alloc]init];
    [cache setStoragePath:cachePath];
    //緩存策略
    cache.defaultCachePolicy = ASIOnlyLoadIfNotCachedCachePolicy;
    
    //每次啓動，清除上次緩存文件
    request.cacheStoragePolicy = ASICacheForSessionDurationCacheStoragePolicy;
    //緩存對象
    request.downloadCache = cache;
    
    [request setFailedBlock:^{
        NSLog(@"error: %@", request.error);
    }];
    //發送異步請求
    [request startAsynchronous];
}

需要添加ASIHTtpRequestSample開源文件以及

libz.dylib

libxml2.dylib

moblieCoreServices.framework

systemConfigration.framework

CFNetwork.framework

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