ios实现简易队列-移动开发

这篇文章主要为大家详细介绍了ios实现简易队列，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

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

IiBzcmM9

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