JDStatusBarNotification+Queue category

Example.m

// Create statusbar activity per upload
JDStatusBarActivity* upload1 = [JDStatusBarActivity new];
upload1.styleName = JDStatusBarStyleDark;
upload1.message = @"Uploading file #1";

JDStatusBarActivity* upload2 = [JDStatusBarActivity new];
upload2.styleName = JDStatusBarStyleDark;
upload2.message = @"Uploading file #2";

// Add activities to status bar
// FIFO principle, last added is displayed in statusbar
[JDStatusBarNotification addActivity:upload1];
[JDStatusBarNotification addActivity:upload2];

// KVO observers for NSProgress
NSProgress* progress1 = /* ... */;
NSProgress *progress2 = /* ... */;

[self.KVOController observe:progress1 keyPath:@"completedUnitCount" options:NSKeyValueObservingOptionNew block:^(id observer, NSProgress* progress, NSDictionary *change) {
    upload1.progress = progress.fractionCompleted;
    
    if(progress.completedUnitCount == progress.totalUnitCount) {
        [upload1 complete]; // pop statusbar activity when finished
    }
}];

[self.KVOController observe:progress2 keyPath:@"completedUnitCount" options:NSKeyValueObservingOptionNew block:^(id observer, NSProgress* progress, NSDictionary *change) {
    upload2.progress = progress.fractionCompleted;
    
    if(progress.completedUnitCount == progress.totalUnitCount) {
        [upload2 complete]; // pop statusbar activity when finished
    }
}];

JDStatusBarNotification+Queue.h

//
//  JDStatusBarNotification+Queue.h
//
//  Created by pronebird on 3/3/15.
//  Copyright (c) 2015 pronebird. All rights reserved.
//

#import <JDStatusBarNotification/JDStatusBarNotification.h>

@interface JDStatusBarActivity : NSObject 

@property (nonatomic) NSString* message;
@property (nonatomic) CGFloat progress;
@property (nonatomic) NSString* styleName;
@property (nonatomic, readonly, getter=isCurrent) BOOL current;

- (void)complete;

@end

@interface JDStatusBarNotification (Queue)

+ (void)addActivity:(JDStatusBarActivity*)activity;
+ (void)removeActivity:(JDStatusBarActivity*)activity;

@end

JDStatusBarNotification+Queue.m

//
//  JDStatusBarNotification+Queue.m
//
//  Created by pronebird on 3/3/15.
//  Copyright (c) 2015 pronebird. All rights reserved.
//

#import "JDStatusBarNotification+Queue.h"

static NSMutableArray* _queue;

@interface JDStatusBarActivity()

@property (readwrite) BOOL current;

@end

@implementation JDStatusBarActivity

- (void)setMessage:(NSString *)message {
    if(![_message isEqualToString:message]) {
        _message = message;
        
        if([self isCurrent]) {
            [JDStatusBarNotification showWithStatus:message styleName:self.styleName];
        }
    }
}

- (void)setProgress:(CGFloat)progress {
    if(_progress != progress) {
        _progress = progress;
        
        if([self isCurrent]) {
            [JDStatusBarNotification showProgress:self.progress];
        }
    }
}

- (void)setStyleName:(NSString *)styleName {
    if(![_styleName isEqualToString:styleName]) {
        _styleName = styleName;
        
        if(self.message && [self isCurrent]) {
            [JDStatusBarNotification showWithStatus:self.message styleName:styleName];
        }
    }
}

- (void)fire {
    if(![self isCurrent]) {
        return;
    }
    
    [JDStatusBarNotification showWithStatus:self.message styleName:self.styleName];
    [JDStatusBarNotification showProgress:self.progress];
}

- (void)complete {
    [JDStatusBarNotification removeActivity:self];
}

@end

@implementation JDStatusBarNotification (Queue)

+ (void)addActivity:(JDStatusBarActivity*)activity {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        _queue = [NSMutableArray new];
    });
    
    JDStatusBarActivity* prevActivity = [_queue lastObject];
    
    prevActivity.current = NO;
    activity.current = YES;
    
    [_queue addObject:activity];
    [activity fire];
}

+ (void)removeActivity:(JDStatusBarActivity*)activity {
    if(!_queue) {
        return;
    }
    
    NSUInteger index = [_queue indexOfObject:activity];
    if(index == NSNotFound) {
        return;
    }
    
    [_queue removeObjectAtIndex:index];
    JDStatusBarActivity* prevActivity = [_queue lastObject];
    
    activity.current = NO;
    
    if(index == _queue.count) {
        prevActivity.current = YES;
        [prevActivity fire];
    }
    
    if(_queue.count == 0) {
        [JDStatusBarNotification dismissAnimated:YES];
    }
}

@end