iOS总结:ASIHttpRequest类库发送请求(同步请求和异步请求)
1.发送异步请求
1)在.h中导入头文件
#import "ASIHTTPRequest.h"
2)设置代理
ASIHTTPRequestDelegate
3)URL —-> 发请求 —> 设置代理 —> 开始异步请求
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor whiteColor];
//异步请求
//url
NSURL *url = [NSURL URLWithString:@"http://www.baidu.com"];
//发请求
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
//代理
request.delegate = self;
//开始
[request startAsynchronous];
[self.window makeKeyAndVisible];
return YES;
}
3)若获取返回的文本信息,调用responseString方法,
若获取的是二进制文件,如:图片、MP3文件,则调用NSData方法,获取一个NSData对象
-(void)requestFinished:(ASIHTTPRequest *)request
{
NSString *response = [request responseString];
NSLog(@"%@", response);
NSData *data = [request responseData];
NSLog(@"%@", data);
}
-(void)requestFailed:(ASIHTTPRequest *)request
{
NSError *error = [request error];
NSLog(@"%@", error);
}
输出结果:
文本信息为
二进制信息为
2.同步请求(和异步请求类似)
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.window.backgroundColor = [UIColor whiteColor];
//同步请求
//url
NSURL *url = [NSURL URLWithString:@"http://www.baidu.com"];
//发请求
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
//代理
request.delegate = self;
//开始
[request startSynchronous];
NSError *error = [request error];
if (!error) {
NSString *response = [request responseString];
NSLog(@"%@", response);
}
[self.window makeKeyAndVisible];
return YES;
}
一般情况下，应该优先使用异步请求，当在主线程中使用ASIHTTPRequest同步请求，应用程序的界面会锁定，无法进行任何操作，直到请求完成。
