我需要在等待来自Web服务的响应时显示UIActivityIndicator。我到底把它的代码放在哪里？它没有这种方式。活动指标未显示。
我是否需要使用异步请求才能显示它？
-(void)callWebService
{
[self.customercareSearchbar resignFirstResponder];
[self.SRResultDictionary removeAllObjects];
NSLog(@"web service called");
NSString *srn = _SRNumber;
NSString *serviceURL = [NSString stringWithFormat:@"https://abcdef...];
@try {
UIActivityIndicatorView *activity = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
[self.view addSubview:activity];
activity.center = self.view.center;
[self.view bringSubviewToFront:loadView];
activity.hidesWhenStopped = YES;
[activity setHidden:NO];
[activity startAnimating];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:serviceURL]];
NSURLResponse *serviceResponse = nil;
NSError *err = nil;
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&serviceResponse error:&err];
[activity stopAnimating];
NSMutableDictionary *parsedData = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingMutableContainers error:&err];
if(!parsedData)
{
NSLog(@"data not parsed");
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"ERROR" message:@"Problem in Network. Please Try Again!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
[alert show];
[self.customerCareTableView setHidden:YES];
}
else
{
NSLog(@"parsed");
NSLog(@"parsed.. the size is %lu", (unsigned long)[parsedData count]);
NSLog(@"%@", parsedData);
NSString *status = [parsedData objectForKey:@"ns:Status"];
NSLog(@"the status is %@", status);
if([status isEqualToString:@"Success"])
{
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
if([[prefs objectForKey:@"SwitchState"] isEqualToString:@"OFF"])
{
//do nothing
}
else
{
[self saveNumberInDatabase:srn];
}
NSMutableDictionary *third = [parsedData objectForKey:@"ListOfXrxLvServiceRequest"];
NSLog(@"internal dict is %@", third);
self.SRResultDictionary = [third objectForKey:@"ServiceRequest"];
[self.customerCareTableView reloadData];
[self.customerCareTableView setHidden:NO];
}
else if([status isEqualToString:@"Record Not Found"])
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Invalid Entry" message:@"Please enter a valid Service Request Number" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil];
[alert show];
[self.customerCareTableView setHidden:YES];
}
else
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"ERROR" message:@"Problem in Network. Please Try Again!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
[alert show];
[self.customerCareTableView setHidden:YES];
}
}
}
@catch (NSException *exception)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NULL message:@"Problem In Network Connection. Please Try Again!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
[self.customerCareTableView setHidden:YES];
}
@finally {
}
}
答案 0 :(得分：3)
是的，问题是Synchronous请求。
如果可以发送ASynchronous请求，那么请尝试这样做。
[NSURLConnection sendAsynchronousRequest:request queue:nil completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
// stop activity
// write other code you want to execute
}];
答案 1 :(得分：0)
我发现MBProgressHUD是最佳指标，你可以使用它只是在你的方法调用的开始就像
dispatch_async(dispatch_get_main_queue(), ^{
if(!HUD) HUD = [[MBProgressHUD alloc] initWithView:self.navigationController.view];
[self.view addSubview:HUD];
HUD.delegate = self;
HUD.userInteractionEnabled = NO;
HUD.labelText = @"Saving your Preferences...";
[[UIApplication sharedApplication] beginIgnoringInteractionEvents];
[HUD show:YES];
});
并在你的finally块中你可以隐藏这个
dispatch_async(dispatch_get_main_queue(), ^{
[HUD hide:YES];
[[UIApplication sharedApplication] endIgnoringInteractionEvents];
});
答案 2 :(得分：0)
//.h file
@interface ViewController : UIViewController
{
UIActivityIndicatorView *activityIndicator;
BOOL showingActivityIndicator;
}
@property(nonatomic) BOOL showingActivityIndicator;
@property(nonatomic) UIActivityIndicatorView *activityIndicator;
@end
//.m file
@synthesize showingActivityIndicator,activityIndicator;
/////在viewDidLoad中调用此方法
-(void)initializeClass
{
self.activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
self.activityIndicator.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin|UIViewAutoresizingFlexibleTopMargin|UIViewAutoresizingFlexibleRightMargin|UIViewAutoresizingFlexibleBottomMargin;
self.activityIndicator.hidesWhenStopped = YES;
[self layoutSubviews];
}
-(void)layoutSubviews
{
CGRect activityIndicatorFrame = self.activityIndicator.frame;
activityIndicatorFrame.origin.x = (self.view.frame.size.width - self.activityIndicator.frame.size.width) / 2;
activityIndicatorFrame.origin.y = (self.view.frame.size.height - self.activityIndicator.frame.size.height) / 2;
self.activityIndicator.frame = activityIndicatorFrame;
[self.view addSubview:self.activityIndicator];
}
-(void)setShowingActivityIndicator:(BOOL)showingActivityIndicators
{
if (showingActivityIndicators) {
[self.activityIndicator startAnimating];
} else {
[self.activityIndicator stopAnimating];
}
showingActivityIndicator= showingActivityIndicators;
}
-(void)dummyButtonAction // you button action to call service
{
[self setShowingActivityIndicator:YES];
[self performSelector:@selector(callWebService) withObject:nil afterDelay:0.3];
// [self callWebService];
}
-(void)callWebService
{
[self.view endEditing:YES]; // this statement will make sure keyboard is resigned
//[self.SRResultDictionary removeAllObjects];
NSLog(@"web service called");
NSString *srn = _SRNumber;
NSString *serviceURL = [NSString stringWithFormat:@"https://abcdef...];
@try {
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:serviceURL]];
NSURLResponse *serviceResponse = nil;
NSError *err = nil;
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&serviceResponse error:&err];
NSMutableDictionary *parsedData = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingMutableContainers error:&err];
if(!parsedData)
{
NSLog(@"data not parsed");
[self ShowAlertViewWithTitleString:@"ERROR":@"Problem in Network. Please Try Again!"];
[self.customerCareTableView setHidden:YES];
}
else
{
NSLog(@"parsed");
NSLog(@"parsed.. the size is %lu", (unsigned long)[parsedData count]);
NSLog(@"%@", parsedData);
NSString *status = [parsedData objectForKey:@"ns:Status"];
NSLog(@"the status is %@", status);
if([status isEqualToString:@"Success"])
{
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
if([[prefs objectForKey:@"SwitchState"] isEqualToString:@"OFF"])
{
//do nothing
}
else
{
[self saveNumberInDatabase:srn];
}
NSMutableDictionary *third = [parsedData objectForKey:@"ListOfXrxLvServiceRequest"];
NSLog(@"internal dict is %@", third);
self.SRResultDictionary = [third objectForKey:@"ServiceRequest"];
[self.customerCareTableView reloadData];
[self.customerCareTableView setHidden:NO];
}
else if([status isEqualToString:@"Record Not Found"])
{
[self ShowAlertViewWithTitleString:@"Invalid Entry":@"Please enter a valid Service Request Number"];
[self.customerCareTableView setHidden:YES];
}
else
{
[self ShowAlertViewWithTitleString:@"ERROR":@"Problem in Network. Please Try Again!"];
[self.customerCareTableView setHidden:YES];
}
}
}
@catch (NSException *exception)
{
[self ShowAlertViewWithTitleString:@"":@"Problem In Network Connection. Please Try Again!"];
[self.customerCareTableView setHidden:YES];
}
@finally {
}
[self setShowingActivityIndicator:NO];
}
- (void)ShowAlertViewWithTitleString :(NSString *)title :(NSString *)message
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title message:message delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
}