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自己动手实现一个队列LGQueue

iOS系统没有提供queue容器，如果想用，需要手动自己来写一个：

// //  LGQueue.h //  AntsSportApp // //  Created by ligang on 15/3/24. //  Copyright (c) 2015年 ligang. All rights reserved. //  #import <Foundation/Foundation.h>  @interface LGQueue : NSObject  @property (nonatomic, strong) NSMutableArray *queue;  @property (nonatomic, readonly) NSInteger count;  - (void)enterQueue:(id)object; - (id)exitQueue; - (void)clear;    @end

// //  LGQueue.m //  AntsSportApp // //  Created by ligang on 15/3/24. //  Copyright (c) 2015年 ligang. All rights reserved. // #import "LGQueue.h" @implementation LGQueue - (id)init {  if ( self = [super init] ) {   self.queue = [[NSMutableArray alloc] init];   _count = 0;  }  return self; } - (void)enterQueue:(id)object {  [self.queue addObject:object];  _count = self.queue.count; } - (id)exitQueue {  if ( self.queue.count == 0 )  return nil;  id object = [self.queue objectAtIndex:0];  [self.queue removeObjectAtIndex:0];  _count = self.queue.count;  return object; } - (void)clear {  [self.queue removeAllObjects];  _count = 0; } @end

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