NSURLConnection和NSRunLoop

标签：object-c   ios开发   线程   

主线程中创建一个NSURLConnection并异步执行

[self performSelectorOnMainThread:@selector(start) withObject:nil waitUntilDone:YES];
- (void)start
{
    //step 1:请求地址
    NSURL *url = [NSURL URLWithString:@"www.2cto.com"];
    //step 2:实例化一个request
    NSURLRequest *request =[NSURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:30.0];
    //step 3：创建链接
    self.connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];//直接运行了
    if (self.connection) {
        NSLog(@"链接成功");
    }else {
        NSLog(@"链接失败");
    }
}

解决方法，修改代码为：

[self performSelectorOnMainThread:@selector(start) withObject:nil waitUntilDone:YES];
- (void)start
{
    //step 1:请求地址
    NSURL *url = [NSURL URLWithString:@"www.2cto.com"];
    //step 2:实例化一个request
    NSURLRequest *request =[NSURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:30.0];
    //step 3：创建链接
    self.connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:NO];//暂时不运行
    [connection scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];//用NSRunLoopCommonModes
    [connection start];    
    if (self.connection) {
        NSLog(@"链接成功");
    }else {
        NSLog(@"链接失败");
    }
}

NSURLConnection和NSRunLoop

标签：object-c   ios开发   线程   

原文地址：http://blog.csdn.net/fxmmc/article/details/40072843