ASIHttpRequest-创建和执行request 的 异步加载和使用块

ASIHttpRequest-创建和执行request

//--------- 异步加载 -----------------

+ (void)grabURLInBackground
{
NSURL *url = [NSURL URLWithString:@"http://localhost:3000/api/blog_lists"];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setDelegate:self];
// [request setDidFailSelector:@selector(requestFailed:)];
// [request setDidFinishSelector:@selector(requestFinished:)];
[request startAsynchronous];

[request setDefaultResponseEncoding:NSUTF8StringEncoding];
}

+ (void)requestFinished:(ASIHTTPRequest *)request
{
// Use when fetching text data
NSString *responseString = [request responseString];
NSLog ( @"----------------%@" ,responseString);

// Use when fetching binary data
// NSData *responseData = [request responseData];
}

+ (void)requestFailed:(ASIHTTPRequest *)request
{
NSError *error = [request error];
NSLog(@"%@",error);
}

+ (NSMutableArray *)getBlogList
{

// [self grabURLInBackground];
[self blockInBackground];
return nil;
}

//--------- block块 -----------------
+ (void)blockInBackground
{
NSURL *url = [NSURL URLWithString:@"http://localhost:3000/api/blog_lists"];

__block ASIHTTPRequest *request = [ ASIHTTPRequest requestWithURL :url];

// ASIHTTPRequest 支持 iOS 4.0 的块语法，你可以把委托方法定义到块中
[request setCompletionBlock :^{
// 请求响应结束，返回 responseString
NSString *responseString = [request responseString ]; // 对于 2 进制数据，使用 NSData 返回 NSData *responseData = [request responseData];
NSLog ( @"%@" ,responseString);
}];

[request setFailedBlock :^{
// 请求响应失败，返回错误信息
NSError *error = [request error ];
NSLog ( @"error:%@" ,[error userInfo ]);
}];

[request startAsynchronous ];
}