ios实现简易队列

本文实例为大家分享了ios实现简易队列的具体代码，供大家参考，具体内容如下

满足一些特殊需求

接口部分(队列支持需求)

#import <Foundation/Foundation.h>

@interface XMQueue : NSObject

///队列追加
- (void)add:(id) obj;

///队列取出
- (id)next;

///返回队列最前端,不删除队列内元素
- (id)first;

///队列内是否还有元素
- (BOOL) isEmpty;

///队列转array
- (NSArray *) arrayCopy;
@end

实现方法

#import "XMQueue.h"
@interface XMQueue()
@property NSMutableArray *array;
@property NSInteger currentIndex;
@end
@implementation XMQueue

- (instancetype)init
{
 self = [super init];
 if (self) {
  self.array = [[NSMutableArray alloc] initWithCapacity:32];

 }
 return self;

}

- (void)add:(id) obj{
 if (self.currentIndex >= self.array.count-1) {
  NSMutableArray *newArray = [[NSMutableArray alloc] initWithCapacity:self.array.count*2];
  for (id obj in self.array) {
   [newArray addObject:obj];

  }
  self.array = newArray;
 }
 [self.array addObject:obj];

}

- (id)next{

 if (![self isEmpty]) {
  id obj = [self.array objectAtIndex:0];
  [self.array removeObjectAtIndex:0];
  return obj;
 }else{
  return @"Empty";
 }

}
- (id)first{
 if (![self isEmpty]) {
  return self.array[0];
 }else{
  return @"Empty";
 }
}
- (BOOL) isEmpty{

 return self.array.count == 0;

}

@end

测试

XMQueue *queue = [[XMQueue alloc] init];

 for (int i = 0; i < 5; i++) {
  [queue add:[NSNumber numberWithInt:i]];
 }

 for (NSNumber *number in [queue arrayCopy]) {
  printf("%d,",[number intValue]);

 }
 printf("\n");
 [queue add:[queue next]];
 for (NSNumber *number in [queue arrayCopy]) {
  printf("%d,",[number intValue]);

 }
 printf("\n");
 [queue add:[queue next]];
 for (NSNumber *number in [queue arrayCopy]) {
  printf("%d,",[number intValue]);

 }
 printf("\n");
 [queue add:[queue next]];
 for (NSNumber *number in [queue arrayCopy]) {
  printf("%d,",[number intValue]);

 }
 printf("\n");
 [queue add:[queue next]];
 for (NSNumber *number in [queue arrayCopy]) {
  printf("%d,",[number intValue]);

 }
 printf("\n");
 [queue add:[queue next]];
 for (NSNumber *number in [queue arrayCopy]) {
  printf("%d,",[number intValue]);

 }

结果

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