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// AFNetworkActivityIndicatorManager.m
//
// 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 "AFNetworkActivityIndicatorManager.h"
#import "AFHTTPRequestOperation.h"
#if __IPHONE_OS_VERSION_MIN_REQUIRED
static NSTimeInterval const kAFNetworkActivityIndicatorInvisibilityDelay = 0.17;
@interface AFNetworkActivityIndicatorManager ()
@property (readwrite, assign) NSInteger activityCount;
@property (readwrite, nonatomic, retain) NSTimer *activityIndicatorVisibilityTimer;
@property (readonly, getter = isNetworkActivityIndicatorVisible) BOOL networkActivityIndicatorVisible;
- (void)updateNetworkActivityIndicatorVisibility;
- (void)updateNetworkActivityIndicatorVisibilityDelayed;
@end
@implementation AFNetworkActivityIndicatorManager
@synthesize activityCount = _activityCount;
@synthesize activityIndicatorVisibilityTimer = _activityIndicatorVisibilityTimer;
@synthesize enabled = _enabled;
@dynamic networkActivityIndicatorVisible;
+ (AFNetworkActivityIndicatorManager *)sharedManager {
static AFNetworkActivityIndicatorManager *_sharedManager = nil;
static dispatch_once_t oncePredicate;
dispatch_once(&oncePredicate, ^{
_sharedManager = [[self alloc] init];
});
return _sharedManager;
}
+ (NSSet *)keyPathsForValuesAffectingIsNetworkActivityIndicatorVisible {
return [NSSet setWithObject:@"activityCount"];
}
- (id)init {
self = [super init];
if (!self) {
return nil;
}
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(incrementActivityCount) name:AFNetworkingOperationDidStartNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(decrementActivityCount) name:AFNetworkingOperationDidFinishNotification object:nil];
return self;
}
- (void)dealloc {
[[NSNotificationCenter defaultCenter] removeObserver:self];
[_activityIndicatorVisibilityTimer invalidate];
}
- (void)updateNetworkActivityIndicatorVisibilityDelayed {
if (self.enabled) {
// Delay hiding of activity indicator for a short interval, to avoid flickering
if (![self isNetworkActivityIndicatorVisible]) {
[self.activityIndicatorVisibilityTimer invalidate];
self.activityIndicatorVisibilityTimer = [NSTimer timerWithTimeInterval:kAFNetworkActivityIndicatorInvisibilityDelay target:self selector:@selector(updateNetworkActivityIndicatorVisibility) userInfo:nil repeats:NO];
[[NSRunLoop mainRunLoop] addTimer:self.activityIndicatorVisibilityTimer forMode:NSRunLoopCommonModes];
} else {
[self performSelectorOnMainThread:@selector(updateNetworkActivityIndicatorVisibility) withObject:nil waitUntilDone:NO modes:[NSArray arrayWithObject:NSRunLoopCommonModes]];
}
}
}
- (BOOL)isNetworkActivityIndicatorVisible {
return _activityCount > 0;
}
- (void)updateNetworkActivityIndicatorVisibility {
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:[self isNetworkActivityIndicatorVisible]];
}
// Not exposed, but used if activityCount is set via KVC.
- (NSInteger)activityCount {
return _activityCount;
}
- (void)setActivityCount:(NSInteger)activityCount {
@synchronized(self) {
_activityCount = activityCount;
}
[self updateNetworkActivityIndicatorVisibilityDelayed];
}
- (void)incrementActivityCount {
[self willChangeValueForKey:@"activityCount"];
@synchronized(self) {
_activityCount++;
}
[self didChangeValueForKey:@"activityCount"];
[self updateNetworkActivityIndicatorVisibilityDelayed];
}
- (void)decrementActivityCount {
[self willChangeValueForKey:@"activityCount"];
@synchronized(self) {
_activityCount = MAX(_activityCount - 1, 0);
}
[self didChangeValueForKey:@"activityCount"];
[self updateNetworkActivityIndicatorVisibilityDelayed];
}
@end
#endif
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