在我的NSMutableArray
中有4个元素,我用下面的代码下载文件,在UITextView中显示文件数据,如果不加for循环,运行正常,但是问题出在这个函数中:
- (void)complexDownload {
int i;
for (i=0; i < downloadArray.count; i++) {
if (isBusy == NO) {
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];
downloadURL = [downloadArray objectAtIndex:i];
NSLog(@"URL is %@", downloadURL);
NSLog(@"Downloading object at index %i", i);
NSURL *url = downloadURL;
NSURLRequest *theRequest=[NSURLRequest requestWithURL:url
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
NSURLConnection *theConnection = [NSURLConnection connectionWithRequest:theRequest delegate:self];
if (theConnection) {
self.downloadData = [NSMutableData data];
isBusy = YES;
NSLog(@"Busy value in download cycle equals %i, downloading", isBusy);
} else {
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
NSLog(@"Connection failed");
isBusy = NO;
}
}
}
}
我最初以为是isBusyBOOL的问题,但是去掉if条件之后还是会崩溃。
余下的函数如下:
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[downloadData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSString *dataString = [[NSString alloc] initWithData:downloadData encoding:NSASCIIStringEncoding];
self.dataTextView.text = dataString;
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
NSLog(@"Download finished!");
isBusy = NO;
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
NSLog(@"%@", error);
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
}
所有的NSLogged值都正常,array中的数组链接也正确。
编译屏幕截图点击这里