get 和post 方式請求數據的時候,只想說一句話,別忘了對NSMutableData *a 也就是用來接受數據的中間實例進行初始化........

get 異步請求網絡數據的步驟

? NSURL *url = [[NSURL alloc] initWithString:@"http://f.hiphotos.baidu.com/image/w%3D2048/sign=2f72d721bb12c8fcb4f3f1cdc83b9345/ac4bd11373f082020756343e49fbfbedaa641bee.jpg"];

??? NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:15];

??? NSURLConnection *connect = [[NSURLConnection alloc] initWithRequest:request delegate:self];

??? [connect release];

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)respons
{
??? [self.aview setProgress:0 animated:YES];
??? self.a = [respons expectedContentLength];
??? [self.receiverData setLength:0];
?? ?
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
??? [self.receiverData appendData:data];
??? float b = [self.receiverData length]/self.a;
??? [self.aview setProgress:b animated:YES];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
?
??? self.imageView.image? = [UIImage imageWithData:self.receiverData];
?? ?
}
同步

??? NSURL *url = [[NSURL alloc] initWithString:@"http://f.hiphotos.baidu.com/image/w%3D2048/sign=2f72d721bb12c8fcb4f3f1cdc83b9345/ac4bd11373f082020756343e49fbfbedaa641bee.jpg"];
??? NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
??? NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
??? UIImage *image = [UIImage imageWithData:data];
??? self.imageView.image = image;

轉載于:https://www.cnblogs.com/xukunhenwuliao/p/3576251.html

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