我有一个表格视图，可以从RSS源获取数据。我正在尝试在我的iPad应用中加载表格视图时显示我的活动指示器。它在iPhone上运行良好，但指示灯永远不会出现在iPad上。有什么建议吗？
@implementation ActionAlertsIpad
{
UIActivityIndicatorView *loadingIndicator;
}
在viewDidLoad中：
CGFloat width = CGRectGetWidth(self.view.bounds);
CGFloat height = CGRectGetHeight(self.view.bounds);
loadingIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
loadingIndicator.center = CGPointMake(width/2, height/2);
loadingIndicator.hidesWhenStopped = YES;
[self.view addSubview:loadingIndicator];
[loadingIndicator startAnimating];
在connectionDidFinishLoading中：
[loadingIndicator stopAnimating];
编辑：我被要求提供更多代码，因此以下是与此相关的所有代码。
#import "ActionAlertsIpad.h"
#import "RSSChannel.h"
#import "RSSItem.h"
#import "WebViewControllerIpad.h"
// #import "CustomCellBackground.h"
#import "DTCustomColoredAccessory.h"
#import "KFBAppDelegate.h"
@implementation ActionAlertsIpad
{
UIActivityIndicatorView *loadingIndicator;
}
@synthesize webViewController;
- (void)viewDidLoad
{
UIImageView *background = [[UIImageView alloc]init];
background.image = [UIImage imageNamed:@"plain_app-background.png"];
CGFloat width = CGRectGetWidth(self.view.bounds);
CGFloat height = CGRectGetHeight(self.view.bounds);
self.tableView = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStyleGrouped];
[self.tableView setBackgroundView:background];
self.title = @"Action Alerts";
loadingIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
loadingIndicator.center = CGPointMake(width/2, height/2);
loadingIndicator.hidesWhenStopped = YES;
[self.view addSubview:loadingIndicator];
[loadingIndicator startAnimating];
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
NSLog(@"%@ found a %@ element", self, elementName);
if ([elementName isEqual:@"channel"])
{
// If the parser saw a channel, create new instance, store in our ivar
channel = [[RSSChannel alloc]init];
// Give the channel object a pointer back to ourselves for later
[channel setParentParserDelegate:self];
// Set the parser's delegate to the channel object
[parser setDelegate:channel];
}
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// return 0;
NSLog(@"channel items %d", [[channel items]count]);
return [[channel items]count];
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 60;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
// return nil;
UIImageView *image = [[UIImageView alloc]init];
image.image = [UIImage imageNamed:@"CellImage.png"];
UIImageView *background = [[UIImageView alloc]init];
background.image = [UIImage imageNamed:@"plain_app-background.png"];
UIImageView *highlightedCellImage = [[UIImageView alloc]init];
highlightedCellImage.image = [UIImage imageNamed:@"HighlightedCellImage"];
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"UITableViewCell"];
if (cell == nil)
{
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"UITableViewCell"];
cell.textLabel.font=[UIFont systemFontOfSize:16.0];
}
RSSItem *item = [[channel items]objectAtIndex:[indexPath row]];
NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
[formatter setDateFormat:@"EEE, dd MMM yyyy HH:mm:ssZ"];
NSDate *pubDate = [formatter dateFromString:[item date]];
[formatter setDateStyle:NSDateFormatterMediumStyle];
NSString *dateString = [formatter stringFromDate:pubDate];
NSLog(@"Date String: %@", dateString);
[[cell textLabel]setText:[item title]];
[[cell detailTextLabel]setText:dateString];
NSLog(@"Date: %@", [item date]);
tableView.backgroundColor = [UIColor clearColor];
// cell.backgroundView = [[CustomCellBackground alloc] init];
// cell.selectedBackgroundView = [[CustomCellBackground alloc] init];
cell.textLabel.backgroundColor = [UIColor clearColor];
cell.textLabel.highlightedTextColor = [UIColor blueColor];
cell.textLabel.font = [UIFont fontWithName:@"FranklinGothicStd-ExtraCond" size:24.0];
cell.textLabel.textColor = [UIColor whiteColor];
cell.detailTextLabel.backgroundColor = [UIColor clearColor];
cell.detailTextLabel.highlightedTextColor = [UIColor blueColor];
cell.detailTextLabel.font = [UIFont fontWithName:@"FranklinGothicStd-ExtraCond" size:18.0];
cell.detailTextLabel.textColor = [UIColor whiteColor];
cell.backgroundView = image;
cell.selectedBackgroundView = highlightedCellImage;
tableView.backgroundView = background;
DTCustomColoredAccessory *accessory = [DTCustomColoredAccessory accessoryWithColor:cell.textLabel.textColor];
accessory.highlightedColor = [UIColor blueColor];
cell.accessoryView =accessory;
return cell;
}
- (void)fetchEntries
{
// Create a new data container for the stuff that comes back from the service
xmlData = [[NSMutableData alloc]init];
// Construct a URL that will ask the service for what you want -
// note we can concatenate literal strings together on multiple lines in this way - this results in a single NSString instance
NSURL *url = [NSURL URLWithString:@"http://kyfbnewsroom.com/category/public-affairs/notifications/feed/"];
// Put that URL into an NSURLRequest
NSURLRequest *req = [NSURLRequest requestWithURL:url];
// Create a connection that will exchange this request for data from the URL
connection = [[NSURLConnection alloc]initWithRequest:req delegate:self startImmediately:YES];
}
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self)
{
[self fetchEntries];
}
return self;
}
// This method will be called several times as the data arrives
- (void)connection:(NSURLConnection *)conn didReceiveData:(NSData *)data
{
// Add the incoming chunk of data to the container we are keeping
// The data always comes in the correct order
[xmlData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)conn
{
/* We are just checking to make sure we are getting the XML
NSString *xmlCheck = [[NSString alloc]initWithData:xmlData encoding:NSUTF8StringEncoding];
NSLog(@"xmlCheck = %@", xmlCheck);*/
[loadingIndicator stopAnimating];
// Create the parser object with the data received from the web service
NSXMLParser *parser = [[NSXMLParser alloc]initWithData:xmlData];
// Give it a delegate - ignore the warning here for now
[parser setDelegate:self];
//Tell it to start parsing - the document will be parsed and the delegate of NSXMLParser will get all of its delegate messages sent to it before this line finishes execution - it is blocking
[parser parse];
// Get rid of the XML data as we no longer need it
xmlData = nil;
// Reload the table.. for now, the table will be empty
NSMutableArray *notActionAlerts = [NSMutableArray array];
for (RSSItem *object in channel.items) {
if (!object.isActionAlert) {
[notActionAlerts addObject:object];
}
}
for (RSSItem *object in notActionAlerts) {
[channel.items removeObject:object];
}
[[self tableView]reloadData];
NSLog(@"%@\n %@\n %@\n", channel, [channel title], [channel infoString]);
}
- (void)connection:(NSURLConnection *)conn didFailWithError:(NSError *)error
{
// Release the connection object, we're done with it
connection = nil;
// Release the xmlData object, we're done with it
xmlData = nil;
// Grab the description of the error object passed to us
NSString *errorString = [NSString stringWithFormat:@"Fetch failed: %@", [error localizedDescription]];
// Create and show an alert view with this error displayed
UIAlertView *av = [[UIAlertView alloc]initWithTitle:@"Error" message:errorString delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[av show];
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSMutableArray *details = [self.splitViewController.viewControllers mutableCopy];
UINavigationController *detailNav = [[UINavigationController alloc]initWithRootViewController:webViewController];
[details replaceObjectAtIndex:1 withObject:detailNav];
KFBAppDelegate *appDelegate = (KFBAppDelegate *)[[UIApplication sharedApplication]delegate];
appDelegate.splitViewController.viewControllers = details;
appDelegate.window.rootViewController = self.splitViewController;
appDelegate.splitViewController.delegate = webViewController;
[appDelegate.splitViewController viewWillAppear:YES];
// Grab the selected item
RSSItem *entry = [[channel items]objectAtIndex:[indexPath row]];
// Construct a URL with the link string of the item
NSURL *url = [NSURL URLWithString:[entry link]];
// Construct a request object with that URL
NSURLRequest *req = [NSURLRequest requestWithURL:url];
// Load the request into the web view
[[webViewController webView]loadRequest:req];
webViewController.hackyURL = url;
// Set the title of the web view controller's navigation item
[[webViewController navigationItem]setTitle:[entry title]];
}
@end
答案 0 :(得分：0)
同样的代码在Ipad中也适合我。
可能您已在视图中添加了一些子视图，例如i-Pad的活动指示器。
如果可能的话，你可以再分享一些代码。
检查你使用的iphone和ipad的if - else条件