text: //
  //  YYTimer.h
  //  YYKit <https://github.com/ibireme/YYKit>
  //
  //  Created by ibireme on 15/2/7.
  //  Copyright (c) 2015 ibireme.
  //
  //  This source code is licensed under the MIT-style license found in the
  //  LICENSE file in the root directory of this source tree.
  //
  
  #import <Foundation/Foundation.h>
  
  NS_ASSUME_NONNULL_BEGIN
  
  /**
   YYTimer is a thread-safe timer based on GCD. It has similar API with `NSTimer`.
   YYTimer object differ from NSTimer in a few ways:
   
   * It use GCD to produce timer tick, and won't be affected by runLoop.
   * It make a weak reference to the target, so it can avoid retain cycles.
   * It always fire on main thread.
   
   */
  @interface YYTimer : NSObject
  
  + (YYTimer *)timerWithTimeInterval:(NSTimeInterval)interval
                              target:(id)target
                            selector:(SEL)selector
                             repeats:(BOOL)repeats;
  
  - (instancetype)initWithFireTime:(NSTimeInterval)start
                          interval:(NSTimeInterval)interval
                            target:(id)target
                          selector:(SEL)selector
                           repeats:(BOOL)repeats NS_DESIGNATED_INITIALIZER;
  
  @property (readonly) BOOL repeats;
  @property (readonly) NSTimeInterval timeInterval;
  @property (readonly, getter=isValid) BOOL valid;
  
  - (void)invalidate;
  
  - (void)fire;
  
  @end
  
  NS_ASSUME_NONNULL_END
  