Created
June 24, 2015 09:25
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Closes the UIActivityIndicator used by concurrent operations when the last one finishes
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/* | |
* Handles the scenario when you have concurrent operations using | |
* the same activity indicator. Without care, this leads to stop the | |
* indicator when the first operation ends: | |
* Start A | |
* Start B | |
* Start C | |
* Finish B -> without this extensions, the indicator will be stopped here | |
* Finish C | |
* Finish A -> with this extensions, the indicator will be stopped here | |
*/ | |
extension UIActivityIndicatorView { | |
private var startCount: Int { | |
get { | |
// since this is an extension, we cannot use stored properties | |
// use tag to store the value | |
return self.tag | |
} | |
set { | |
self.tag = newValue | |
} | |
} | |
public func startAnimatingConcurrent() { | |
objc_sync_enter(self) | |
if startCount == 0 { | |
self.startAnimating() | |
} | |
startCount++ | |
objc_sync_exit(self) | |
} | |
public func stopAnimatingConcurrent() { | |
if startCount > 0 { | |
objc_sync_enter(self) | |
startCount-- | |
if startCount == 0 { | |
self.stopAnimating() | |
} | |
objc_sync_exit(self) | |
} | |
} | |
} |
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