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// AFNetworkActivityIndicatorManager.h
//
// Copyright (c) 2011 Gowalla (http://gowalla.com/)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#import <Foundation/Foundation.h>

#import <Availability.h>

#if __IPHONE_OS_VERSION_MIN_REQUIRED
#import <UIKit/UIKit.h>

/**
`AFNetworkActivityIndicatorManager` manages the state of the network activity indicator in the status bar. When enabled, it will listen for notifications indicating that a network request operation has started or finished, and start or stop animating the indicator accordingly. The number of active requests is incremented and decremented much like a stack or a semaphore, and the activity indicator will animate so long as that number is greater than zero.
*/
@interface AFNetworkActivityIndicatorManager : NSObject {
@private
NSInteger _activityCount;
    BOOL _enabled;
    NSTimer *_activityIndicatorVisibilityTimer;
}

/**
A Boolean value indicating whether the manager is enabled.
@discussion If YES, the manager will change status bar network activity indicator according to network operation notifications it receives. The default value is NO.
*/
@property (nonatomic, assign, getter = isEnabled) BOOL enabled;

/**
Returns the shared network activity indicator manager object for the system.
@return The systemwide network activity indicator manager.
*/
+ (AFNetworkActivityIndicatorManager *)sharedManager;

/**
Increments the number of active network requests. If this number was zero before incrementing, this will start animating the status bar network activity indicator.
*/
- (void)incrementActivityCount;

/**
Decrements the number of active network requests. If this number becomes zero before decrementing, this will stop animating the status bar network activity indicator.
*/
- (void)decrementActivityCount;

@end

#endif
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