I know that in order to show/hide the throbber on the status bar I can use
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
But my program sends comm requests from many threads, and I need a location to control whether the throbber should be shown or hidden.
I thought about a centralized class where every comm request will register and this class will know if one-or-many requests are currently transferring bytes, and will turn the throbber on, otherwise - off.
Is this the way to go? 开发者_高级运维why haven't Apple made the throbber appear automatically when networking is happening
Try to use something like this:
static NSInteger __LoadingObjectsCount = 0;
@interface NSObject(LoadingObjects)
+ (void)startLoad;
+ (void)stopLoad;
+ (void)updateLoadCountWithDelta:(NSInteger)countDelta;
@end
@implementation NSObject(LoadingObjects)
+ (void)startLoad {
[self updateLoadCountWithDelta:1];
}
+ (void)stopLoad {
[self updateLoadCountWithDelta:-1];
}
+ (void)updateLoadCountWithDelta:(NSInteger)countDelta {
@synchronized(self) {
__LoadingObjectsCount += countDelta;
__LoadingObjectsCount = (__LoadingObjectsCount < 0) ? 0 : __LoadingObjectsCount ;
[UIApplication sharedApplication].networkActivityIndicatorVisible = __LoadingObjectsCount > 0;
}
}
UPDATE: Made it thread safe
Having some logic in your UIApplication
subclass singleton seems like the natural way to handle this.
//@property bool networkThingerShouldBeThrobbingOrWhatever;
// other necessary properties, like timers
- (void)someNetworkActivityHappened {
// set a timer or something
}
- (void)networkHasBeenQuietForABit
// turn off the indicator.
// UIApplcation.sharedApplication.networkActivityIndicatorVisible = NO;
}
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